diff --git a/physicaly-based-renderer/include/tiny_obj_loader.h b/physicaly-based-renderer/include/tiny_obj_loader.h
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+/*
+The MIT License (MIT)
+
+Copyright (c) 2012-Present, Syoyo Fujita and many contributors.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+//
+// version 2.0.0 : Add new object oriented API. 1.x API is still provided.
+// * Add python binding.
+// * Support line primitive.
+// * Support points primitive.
+// * Support multiple search path for .mtl(v1 API).
+// * Support vertex skinning weight `vw`(as an tinyobj
+// extension). Note that this differs vertex weight([w]
+// component in `v` line)
+// * Support escaped whitespece in mtllib
+// * Add robust triangulation using Mapbox
+// earcut(TINYOBJLOADER_USE_MAPBOX_EARCUT).
+// version 1.4.0 : Modifed ParseTextureNameAndOption API
+// version 1.3.1 : Make ParseTextureNameAndOption API public
+// version 1.3.0 : Separate warning and error message(breaking API of LoadObj)
+// version 1.2.3 : Added color space extension('-colorspace') to tex opts.
+// version 1.2.2 : Parse multiple group names.
+// version 1.2.1 : Added initial support for line('l') primitive(PR #178)
+// version 1.2.0 : Hardened implementation(#175)
+// version 1.1.1 : Support smoothing groups(#162)
+// version 1.1.0 : Support parsing vertex color(#144)
+// version 1.0.8 : Fix parsing `g` tag just after `usemtl`(#138)
+// version 1.0.7 : Support multiple tex options(#126)
+// version 1.0.6 : Add TINYOBJLOADER_USE_DOUBLE option(#124)
+// version 1.0.5 : Ignore `Tr` when `d` exists in MTL(#43)
+// version 1.0.4 : Support multiple filenames for 'mtllib'(#112)
+// version 1.0.3 : Support parsing texture options(#85)
+// version 1.0.2 : Improve parsing speed by about a factor of 2 for large
+// files(#105)
+// version 1.0.1 : Fixes a shape is lost if obj ends with a 'usemtl'(#104)
+// version 1.0.0 : Change data structure. Change license from BSD to MIT.
+//
+
+//
+// Use this in *one* .cc
+// #define TINYOBJLOADER_IMPLEMENTATION
+// #include "tiny_obj_loader.h"
+//
+
+#ifndef TINY_OBJ_LOADER_H_
+#define TINY_OBJ_LOADER_H_
+
+#include <map>
+#include <string>
+#include <vector>
+
+namespace tinyobj {
+
+// TODO(syoyo): Better C++11 detection for older compiler
+#if __cplusplus > 199711L
+#define TINYOBJ_OVERRIDE override
+#else
+#define TINYOBJ_OVERRIDE
+#endif
+
+#ifdef __clang__
+#pragma clang diagnostic push
+#if __has_warning("-Wzero-as-null-pointer-constant")
+#pragma clang diagnostic ignored "-Wzero-as-null-pointer-constant"
+#endif
+
+#pragma clang diagnostic ignored "-Wpadded"
+
+#endif
+
+// https://en.wikipedia.org/wiki/Wavefront_.obj_file says ...
+//
+// -blendu on | off # set horizontal texture blending
+// (default on)
+// -blendv on | off # set vertical texture blending
+// (default on)
+// -boost real_value # boost mip-map sharpness
+// -mm base_value gain_value # modify texture map values (default
+// 0 1)
+// # base_value = brightness,
+// gain_value = contrast
+// -o u [v [w]] # Origin offset (default
+// 0 0 0)
+// -s u [v [w]] # Scale (default
+// 1 1 1)
+// -t u [v [w]] # Turbulence (default
+// 0 0 0)
+// -texres resolution # texture resolution to create
+// -clamp on | off # only render texels in the clamped
+// 0-1 range (default off)
+// # When unclamped, textures are
+// repeated across a surface,
+// # when clamped, only texels which
+// fall within the 0-1
+// # range are rendered.
+// -bm mult_value # bump multiplier (for bump maps
+// only)
+//
+// -imfchan r | g | b | m | l | z # specifies which channel of the file
+// is used to
+// # create a scalar or bump texture.
+// r:red, g:green,
+// # b:blue, m:matte, l:luminance,
+// z:z-depth..
+// # (the default for bump is 'l' and
+// for decal is 'm')
+// bump -imfchan r bumpmap.tga # says to use the red channel of
+// bumpmap.tga as the bumpmap
+//
+// For reflection maps...
+//
+// -type sphere # specifies a sphere for a "refl"
+// reflection map
+// -type cube_top | cube_bottom | # when using a cube map, the texture
+// file for each
+// cube_front | cube_back | # side of the cube is specified
+// separately
+// cube_left | cube_right
+//
+// TinyObjLoader extension.
+//
+// -colorspace SPACE # Color space of the texture. e.g.
+// 'sRGB` or 'linear'
+//
+
+#ifdef TINYOBJLOADER_USE_DOUBLE
+//#pragma message "using double"
+typedef double real_t;
+#else
+//#pragma message "using float"
+typedef float real_t;
+#endif
+
+typedef enum {
+ TEXTURE_TYPE_NONE, // default
+ TEXTURE_TYPE_SPHERE,
+ TEXTURE_TYPE_CUBE_TOP,
+ TEXTURE_TYPE_CUBE_BOTTOM,
+ TEXTURE_TYPE_CUBE_FRONT,
+ TEXTURE_TYPE_CUBE_BACK,
+ TEXTURE_TYPE_CUBE_LEFT,
+ TEXTURE_TYPE_CUBE_RIGHT
+} texture_type_t;
+
+struct texture_option_t {
+ texture_type_t type; // -type (default TEXTURE_TYPE_NONE)
+ real_t sharpness; // -boost (default 1.0?)
+ real_t brightness; // base_value in -mm option (default 0)
+ real_t contrast; // gain_value in -mm option (default 1)
+ real_t origin_offset[3]; // -o u [v [w]] (default 0 0 0)
+ real_t scale[3]; // -s u [v [w]] (default 1 1 1)
+ real_t turbulence[3]; // -t u [v [w]] (default 0 0 0)
+ int texture_resolution; // -texres resolution (No default value in the spec.
+ // We'll use -1)
+ bool clamp; // -clamp (default false)
+ char imfchan; // -imfchan (the default for bump is 'l' and for decal is 'm')
+ bool blendu; // -blendu (default on)
+ bool blendv; // -blendv (default on)
+ real_t bump_multiplier; // -bm (for bump maps only, default 1.0)
+
+ // extension
+ std::string colorspace; // Explicitly specify color space of stored texel
+ // value. Usually `sRGB` or `linear` (default empty).
+};
+
+struct material_t {
+ std::string name;
+
+ real_t ambient[3];
+ real_t diffuse[3];
+ real_t specular[3];
+ real_t transmittance[3];
+ real_t emission[3];
+ real_t shininess;
+ real_t ior; // index of refraction
+ real_t dissolve; // 1 == opaque; 0 == fully transparent
+ // illumination model (see http://www.fileformat.info/format/material/)
+ int illum;
+
+ int dummy; // Suppress padding warning.
+
+ std::string ambient_texname; // map_Ka. For ambient or ambient occlusion.
+ std::string diffuse_texname; // map_Kd
+ std::string specular_texname; // map_Ks
+ std::string specular_highlight_texname; // map_Ns
+ std::string bump_texname; // map_bump, map_Bump, bump
+ std::string displacement_texname; // disp
+ std::string alpha_texname; // map_d
+ std::string reflection_texname; // refl
+
+ texture_option_t ambient_texopt;
+ texture_option_t diffuse_texopt;
+ texture_option_t specular_texopt;
+ texture_option_t specular_highlight_texopt;
+ texture_option_t bump_texopt;
+ texture_option_t displacement_texopt;
+ texture_option_t alpha_texopt;
+ texture_option_t reflection_texopt;
+
+ // PBR extension
+ // http://exocortex.com/blog/extending_wavefront_mtl_to_support_pbr
+ real_t roughness; // [0, 1] default 0
+ real_t metallic; // [0, 1] default 0
+ real_t sheen; // [0, 1] default 0
+ real_t clearcoat_thickness; // [0, 1] default 0
+ real_t clearcoat_roughness; // [0, 1] default 0
+ real_t anisotropy; // aniso. [0, 1] default 0
+ real_t anisotropy_rotation; // anisor. [0, 1] default 0
+ real_t pad0;
+ std::string roughness_texname; // map_Pr
+ std::string metallic_texname; // map_Pm
+ std::string sheen_texname; // map_Ps
+ std::string emissive_texname; // map_Ke
+ std::string normal_texname; // norm. For normal mapping.
+
+ texture_option_t roughness_texopt;
+ texture_option_t metallic_texopt;
+ texture_option_t sheen_texopt;
+ texture_option_t emissive_texopt;
+ texture_option_t normal_texopt;
+
+ int pad2;
+
+ std::map<std::string, std::string> unknown_parameter;
+
+#ifdef TINY_OBJ_LOADER_PYTHON_BINDING
+ // For pybind11
+ std::array<double, 3> GetDiffuse() {
+ std::array<double, 3> values;
+ values[0] = double(diffuse[0]);
+ values[1] = double(diffuse[1]);
+ values[2] = double(diffuse[2]);
+
+ return values;
+ }
+
+ std::array<double, 3> GetSpecular() {
+ std::array<double, 3> values;
+ values[0] = double(specular[0]);
+ values[1] = double(specular[1]);
+ values[2] = double(specular[2]);
+
+ return values;
+ }
+
+ std::array<double, 3> GetTransmittance() {
+ std::array<double, 3> values;
+ values[0] = double(transmittance[0]);
+ values[1] = double(transmittance[1]);
+ values[2] = double(transmittance[2]);
+
+ return values;
+ }
+
+ std::array<double, 3> GetEmission() {
+ std::array<double, 3> values;
+ values[0] = double(emission[0]);
+ values[1] = double(emission[1]);
+ values[2] = double(emission[2]);
+
+ return values;
+ }
+
+ std::array<double, 3> GetAmbient() {
+ std::array<double, 3> values;
+ values[0] = double(ambient[0]);
+ values[1] = double(ambient[1]);
+ values[2] = double(ambient[2]);
+
+ return values;
+ }
+
+ void SetDiffuse(std::array<double, 3> &a) {
+ diffuse[0] = real_t(a[0]);
+ diffuse[1] = real_t(a[1]);
+ diffuse[2] = real_t(a[2]);
+ }
+
+ void SetAmbient(std::array<double, 3> &a) {
+ ambient[0] = real_t(a[0]);
+ ambient[1] = real_t(a[1]);
+ ambient[2] = real_t(a[2]);
+ }
+
+ void SetSpecular(std::array<double, 3> &a) {
+ specular[0] = real_t(a[0]);
+ specular[1] = real_t(a[1]);
+ specular[2] = real_t(a[2]);
+ }
+
+ void SetTransmittance(std::array<double, 3> &a) {
+ transmittance[0] = real_t(a[0]);
+ transmittance[1] = real_t(a[1]);
+ transmittance[2] = real_t(a[2]);
+ }
+
+ std::string GetCustomParameter(const std::string &key) {
+ std::map<std::string, std::string>::const_iterator it =
+ unknown_parameter.find(key);
+
+ if (it != unknown_parameter.end()) {
+ return it->second;
+ }
+ return std::string();
+ }
+
+#endif
+};
+
+struct tag_t {
+ std::string name;
+
+ std::vector<int> intValues;
+ std::vector<real_t> floatValues;
+ std::vector<std::string> stringValues;
+};
+
+struct joint_and_weight_t {
+ int joint_id;
+ real_t weight;
+};
+
+struct skin_weight_t {
+ int vertex_id; // Corresponding vertex index in `attrib_t::vertices`.
+ // Compared to `index_t`, this index must be positive and
+ // start with 0(does not allow relative indexing)
+ std::vector<joint_and_weight_t> weightValues;
+};
+
+// Index struct to support different indices for vtx/normal/texcoord.
+// -1 means not used.
+struct index_t {
+ int vertex_index;
+ int normal_index;
+ int texcoord_index;
+};
+
+struct mesh_t {
+ std::vector<index_t> indices;
+ std::vector<unsigned int>
+ num_face_vertices; // The number of vertices per
+ // face. 3 = triangle, 4 = quad, ...
+ std::vector<int> material_ids; // per-face material ID
+ std::vector<unsigned int> smoothing_group_ids; // per-face smoothing group
+ // ID(0 = off. positive value
+ // = group id)
+ std::vector<tag_t> tags; // SubD tag
+};
+
+// struct path_t {
+// std::vector<int> indices; // pairs of indices for lines
+//};
+
+struct lines_t {
+ // Linear flattened indices.
+ std::vector<index_t> indices; // indices for vertices(poly lines)
+ std::vector<int> num_line_vertices; // The number of vertices per line.
+};
+
+struct points_t {
+ std::vector<index_t> indices; // indices for points
+};
+
+struct shape_t {
+ std::string name;
+ mesh_t mesh;
+ lines_t lines;
+ points_t points;
+};
+
+// Vertex attributes
+struct attrib_t {
+ std::vector<real_t> vertices; // 'v'(xyz)
+
+ // For backward compatibility, we store vertex weight in separate array.
+ std::vector<real_t> vertex_weights; // 'v'(w)
+ std::vector<real_t> normals; // 'vn'
+ std::vector<real_t> texcoords; // 'vt'(uv)
+
+ // For backward compatibility, we store texture coordinate 'w' in separate
+ // array.
+ std::vector<real_t> texcoord_ws; // 'vt'(w)
+ std::vector<real_t> colors; // extension: vertex colors
+
+ //
+ // TinyObj extension.
+ //
+
+ // NOTE(syoyo): array index is based on the appearance order.
+ // To get a corresponding skin weight for a specific vertex id `vid`,
+ // Need to reconstruct a look up table: `skin_weight_t::vertex_id` == `vid`
+ // (e.g. using std::map, std::unordered_map)
+ std::vector<skin_weight_t> skin_weights;
+
+ attrib_t() {}
+
+ //
+ // For pybind11
+ //
+ const std::vector<real_t> &GetVertices() const { return vertices; }
+
+ const std::vector<real_t> &GetVertexWeights() const { return vertex_weights; }
+};
+
+struct callback_t {
+ // W is optional and set to 1 if there is no `w` item in `v` line
+ void (*vertex_cb)(void *user_data, real_t x, real_t y, real_t z, real_t w);
+ void (*vertex_color_cb)(void *user_data, real_t x, real_t y, real_t z,
+ real_t r, real_t g, real_t b, bool has_color);
+ void (*normal_cb)(void *user_data, real_t x, real_t y, real_t z);
+
+ // y and z are optional and set to 0 if there is no `y` and/or `z` item(s) in
+ // `vt` line.
+ void (*texcoord_cb)(void *user_data, real_t x, real_t y, real_t z);
+
+ // called per 'f' line. num_indices is the number of face indices(e.g. 3 for
+ // triangle, 4 for quad)
+ // 0 will be passed for undefined index in index_t members.
+ void (*index_cb)(void *user_data, index_t *indices, int num_indices);
+ // `name` material name, `material_id` = the array index of material_t[]. -1
+ // if
+ // a material not found in .mtl
+ void (*usemtl_cb)(void *user_data, const char *name, int material_id);
+ // `materials` = parsed material data.
+ void (*mtllib_cb)(void *user_data, const material_t *materials,
+ int num_materials);
+ // There may be multiple group names
+ void (*group_cb)(void *user_data, const char **names, int num_names);
+ void (*object_cb)(void *user_data, const char *name);
+
+ callback_t()
+ : vertex_cb(NULL),
+ vertex_color_cb(NULL),
+ normal_cb(NULL),
+ texcoord_cb(NULL),
+ index_cb(NULL),
+ usemtl_cb(NULL),
+ mtllib_cb(NULL),
+ group_cb(NULL),
+ object_cb(NULL) {}
+};
+
+class MaterialReader {
+ public:
+ MaterialReader() {}
+ virtual ~MaterialReader();
+
+ virtual bool operator()(const std::string &matId,
+ std::vector<material_t> *materials,
+ std::map<std::string, int> *matMap, std::string *warn,
+ std::string *err) = 0;
+};
+
+///
+/// Read .mtl from a file.
+///
+class MaterialFileReader : public MaterialReader {
+ public:
+ // Path could contain separator(';' in Windows, ':' in Posix)
+ explicit MaterialFileReader(const std::string &mtl_basedir)
+ : m_mtlBaseDir(mtl_basedir) {}
+ virtual ~MaterialFileReader() TINYOBJ_OVERRIDE {}
+ virtual bool operator()(const std::string &matId,
+ std::vector<material_t> *materials,
+ std::map<std::string, int> *matMap, std::string *warn,
+ std::string *err) TINYOBJ_OVERRIDE;
+
+ private:
+ std::string m_mtlBaseDir;
+};
+
+///
+/// Read .mtl from a stream.
+///
+class MaterialStreamReader : public MaterialReader {
+ public:
+ explicit MaterialStreamReader(std::istream &inStream)
+ : m_inStream(inStream) {}
+ virtual ~MaterialStreamReader() TINYOBJ_OVERRIDE {}
+ virtual bool operator()(const std::string &matId,
+ std::vector<material_t> *materials,
+ std::map<std::string, int> *matMap, std::string *warn,
+ std::string *err) TINYOBJ_OVERRIDE;
+
+ private:
+ std::istream &m_inStream;
+};
+
+// v2 API
+struct ObjReaderConfig {
+ bool triangulate; // triangulate polygon?
+
+ // Currently not used.
+ // "simple" or empty: Create triangle fan
+ // "earcut": Use the algorithm based on Ear clipping
+ std::string triangulation_method;
+
+ /// Parse vertex color.
+ /// If vertex color is not present, its filled with default value.
+ /// false = no vertex color
+ /// This will increase memory of parsed .obj
+ bool vertex_color;
+
+ ///
+ /// Search path to .mtl file.
+ /// Default = "" = search from the same directory of .obj file.
+ /// Valid only when loading .obj from a file.
+ ///
+ std::string mtl_search_path;
+
+ ObjReaderConfig()
+ : triangulate(true), triangulation_method("simple"), vertex_color(true) {}
+};
+
+///
+/// Wavefront .obj reader class(v2 API)
+///
+class ObjReader {
+ public:
+ ObjReader() : valid_(false) {}
+
+ ///
+ /// Load .obj and .mtl from a file.
+ ///
+ /// @param[in] filename wavefront .obj filename
+ /// @param[in] config Reader configuration
+ ///
+ bool ParseFromFile(const std::string &filename,
+ const ObjReaderConfig &config = ObjReaderConfig());
+
+ ///
+ /// Parse .obj from a text string.
+ /// Need to supply .mtl text string by `mtl_text`.
+ /// This function ignores `mtllib` line in .obj text.
+ ///
+ /// @param[in] obj_text wavefront .obj filename
+ /// @param[in] mtl_text wavefront .mtl filename
+ /// @param[in] config Reader configuration
+ ///
+ bool ParseFromString(const std::string &obj_text, const std::string &mtl_text,
+ const ObjReaderConfig &config = ObjReaderConfig());
+
+ ///
+ /// .obj was loaded or parsed correctly.
+ ///
+ bool Valid() const { return valid_; }
+
+ const attrib_t &GetAttrib() const { return attrib_; }
+
+ const std::vector<shape_t> &GetShapes() const { return shapes_; }
+
+ const std::vector<material_t> &GetMaterials() const { return materials_; }
+
+ ///
+ /// Warning message(may be filled after `Load` or `Parse`)
+ ///
+ const std::string &Warning() const { return warning_; }
+
+ ///
+ /// Error message(filled when `Load` or `Parse` failed)
+ ///
+ const std::string &Error() const { return error_; }
+
+ private:
+ bool valid_;
+
+ attrib_t attrib_;
+ std::vector<shape_t> shapes_;
+ std::vector<material_t> materials_;
+
+ std::string warning_;
+ std::string error_;
+};
+
+/// ==>>========= Legacy v1 API =============================================
+
+/// Loads .obj from a file.
+/// 'attrib', 'shapes' and 'materials' will be filled with parsed shape data
+/// 'shapes' will be filled with parsed shape data
+/// Returns true when loading .obj become success.
+/// Returns warning message into `warn`, and error message into `err`
+/// 'mtl_basedir' is optional, and used for base directory for .mtl file.
+/// In default(`NULL'), .mtl file is searched from an application's working
+/// directory.
+/// 'triangulate' is optional, and used whether triangulate polygon face in .obj
+/// or not.
+/// Option 'default_vcols_fallback' specifies whether vertex colors should
+/// always be defined, even if no colors are given (fallback to white).
+bool LoadObj(attrib_t *attrib, std::vector<shape_t> *shapes,
+ std::vector<material_t> *materials, std::string *warn,
+ std::string *err, const char *filename,
+ const char *mtl_basedir = NULL, bool triangulate = true,
+ bool default_vcols_fallback = true);
+
+/// Loads .obj from a file with custom user callback.
+/// .mtl is loaded as usual and parsed material_t data will be passed to
+/// `callback.mtllib_cb`.
+/// Returns true when loading .obj/.mtl become success.
+/// Returns warning message into `warn`, and error message into `err`
+/// See `examples/callback_api/` for how to use this function.
+bool LoadObjWithCallback(std::istream &inStream, const callback_t &callback,
+ void *user_data = NULL,
+ MaterialReader *readMatFn = NULL,
+ std::string *warn = NULL, std::string *err = NULL);
+
+/// Loads object from a std::istream, uses `readMatFn` to retrieve
+/// std::istream for materials.
+/// Returns true when loading .obj become success.
+/// Returns warning and error message into `err`
+bool LoadObj(attrib_t *attrib, std::vector<shape_t> *shapes,
+ std::vector<material_t> *materials, std::string *warn,
+ std::string *err, std::istream *inStream,
+ MaterialReader *readMatFn = NULL, bool triangulate = true,
+ bool default_vcols_fallback = true);
+
+/// Loads materials into std::map
+void LoadMtl(std::map<std::string, int> *material_map,
+ std::vector<material_t> *materials, std::istream *inStream,
+ std::string *warning, std::string *err);
+
+///
+/// Parse texture name and texture option for custom texture parameter through
+/// material::unknown_parameter
+///
+/// @param[out] texname Parsed texture name
+/// @param[out] texopt Parsed texopt
+/// @param[in] linebuf Input string
+///
+bool ParseTextureNameAndOption(std::string *texname, texture_option_t *texopt,
+ const char *linebuf);
+
+/// =<<========== Legacy v1 API =============================================
+
+} // namespace tinyobj
+
+#endif // TINY_OBJ_LOADER_H_
+
+#ifdef TINYOBJLOADER_IMPLEMENTATION
+#include <cassert>
+#include <cctype>
+#include <cmath>
+#include <cstddef>
+#include <cstdlib>
+#include <cstring>
+#include <fstream>
+#include <limits>
+#include <set>
+#include <sstream>
+#include <utility>
+
+#ifdef TINYOBJLOADER_USE_MAPBOX_EARCUT
+
+#ifdef TINYOBJLOADER_DONOT_INCLUDE_MAPBOX_EARCUT
+// Assume earcut.hpp is included outside of tiny_obj_loader.h
+#else
+
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Weverything"
+#endif
+
+#include <array>
+
+#include "mapbox/earcut.hpp"
+
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif
+
+#endif
+
+#endif // TINYOBJLOADER_USE_MAPBOX_EARCUT
+
+namespace tinyobj {
+
+MaterialReader::~MaterialReader() {}
+
+struct vertex_index_t {
+ int v_idx, vt_idx, vn_idx;
+ vertex_index_t() : v_idx(-1), vt_idx(-1), vn_idx(-1) {}
+ explicit vertex_index_t(int idx) : v_idx(idx), vt_idx(idx), vn_idx(idx) {}
+ vertex_index_t(int vidx, int vtidx, int vnidx)
+ : v_idx(vidx), vt_idx(vtidx), vn_idx(vnidx) {}
+};
+
+// Internal data structure for face representation
+// index + smoothing group.
+struct face_t {
+ unsigned int
+ smoothing_group_id; // smoothing group id. 0 = smoothing groupd is off.
+ int pad_;
+ std::vector<vertex_index_t> vertex_indices; // face vertex indices.
+
+ face_t() : smoothing_group_id(0), pad_(0) {}
+};
+
+// Internal data structure for line representation
+struct __line_t {
+ // l v1/vt1 v2/vt2 ...
+ // In the specification, line primitrive does not have normal index, but
+ // TinyObjLoader allow it
+ std::vector<vertex_index_t> vertex_indices;
+};
+
+// Internal data structure for points representation
+struct __points_t {
+ // p v1 v2 ...
+ // In the specification, point primitrive does not have normal index and
+ // texture coord index, but TinyObjLoader allow it.
+ std::vector<vertex_index_t> vertex_indices;
+};
+
+struct tag_sizes {
+ tag_sizes() : num_ints(0), num_reals(0), num_strings(0) {}
+ int num_ints;
+ int num_reals;
+ int num_strings;
+};
+
+struct obj_shape {
+ std::vector<real_t> v;
+ std::vector<real_t> vn;
+ std::vector<real_t> vt;
+};
+
+//
+// Manages group of primitives(face, line, points, ...)
+struct PrimGroup {
+ std::vector<face_t> faceGroup;
+ std::vector<__line_t> lineGroup;
+ std::vector<__points_t> pointsGroup;
+
+ void clear() {
+ faceGroup.clear();
+ lineGroup.clear();
+ pointsGroup.clear();
+ }
+
+ bool IsEmpty() const {
+ return faceGroup.empty() && lineGroup.empty() && pointsGroup.empty();
+ }
+
+ // TODO(syoyo): bspline, surface, ...
+};
+
+// See
+// http://stackoverflow.com/questions/6089231/getting-std-ifstream-to-handle-lf-cr-and-crlf
+static std::istream &safeGetline(std::istream &is, std::string &t) {
+ t.clear();
+
+ // The characters in the stream are read one-by-one using a std::streambuf.
+ // That is faster than reading them one-by-one using the std::istream.
+ // Code that uses streambuf this way must be guarded by a sentry object.
+ // The sentry object performs various tasks,
+ // such as thread synchronization and updating the stream state.
+
+ std::istream::sentry se(is, true);
+ std::streambuf *sb = is.rdbuf();
+
+ if (se) {
+ for (;;) {
+ int c = sb->sbumpc();
+ switch (c) {
+ case '\n':
+ return is;
+ case '\r':
+ if (sb->sgetc() == '\n') sb->sbumpc();
+ return is;
+ case EOF:
+ // Also handle the case when the last line has no line ending
+ if (t.empty()) is.setstate(std::ios::eofbit);
+ return is;
+ default:
+ t += static_cast<char>(c);
+ }
+ }
+ }
+
+ return is;
+}
+
+#define IS_SPACE(x) (((x) == ' ') || ((x) == '\t'))
+#define IS_DIGIT(x) \
+ (static_cast<unsigned int>((x) - '0') < static_cast<unsigned int>(10))
+#define IS_NEW_LINE(x) (((x) == '\r') || ((x) == '\n') || ((x) == '\0'))
+
+template <typename T>
+static inline std::string toString(const T &t) {
+ std::stringstream ss;
+ ss << t;
+ return ss.str();
+}
+
+struct warning_context {
+ std::string *warn;
+ size_t line_number;
+};
+
+// Make index zero-base, and also support relative index.
+static inline bool fixIndex(int idx, int n, int *ret, bool allow_zero,
+ const warning_context &context) {
+ if (!ret) {
+ return false;
+ }
+
+ if (idx > 0) {
+ (*ret) = idx - 1;
+ return true;
+ }
+
+ if (idx == 0) {
+ // zero is not allowed according to the spec.
+ if (context.warn) {
+ (*context.warn) +=
+ "A zero value index found (will have a value of -1 for normal and "
+ "tex indices. Line " +
+ toString(context.line_number) + ").\n";
+ }
+
+ (*ret) = idx - 1;
+ return allow_zero;
+ }
+
+ if (idx < 0) {
+ (*ret) = n + idx; // negative value = relative
+ if ((*ret) < 0) {
+ return false; // invalid relative index
+ }
+ return true;
+ }
+
+ return false; // never reach here.
+}
+
+static inline std::string parseString(const char **token) {
+ std::string s;
+ (*token) += strspn((*token), " \t");
+ size_t e = strcspn((*token), " \t\r");
+ s = std::string((*token), &(*token)[e]);
+ (*token) += e;
+ return s;
+}
+
+static inline int parseInt(const char **token) {
+ (*token) += strspn((*token), " \t");
+ int i = atoi((*token));
+ (*token) += strcspn((*token), " \t\r");
+ return i;
+}
+
+// Tries to parse a floating point number located at s.
+//
+// s_end should be a location in the string where reading should absolutely
+// stop. For example at the end of the string, to prevent buffer overflows.
+//
+// Parses the following EBNF grammar:
+// sign = "+" | "-" ;
+// END = ? anything not in digit ?
+// digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" ;
+// integer = [sign] , digit , {digit} ;
+// decimal = integer , ["." , integer] ;
+// float = ( decimal , END ) | ( decimal , ("E" | "e") , integer , END ) ;
+//
+// Valid strings are for example:
+// -0 +3.1417e+2 -0.0E-3 1.0324 -1.41 11e2
+//
+// If the parsing is a success, result is set to the parsed value and true
+// is returned.
+//
+// The function is greedy and will parse until any of the following happens:
+// - a non-conforming character is encountered.
+// - s_end is reached.
+//
+// The following situations triggers a failure:
+// - s >= s_end.
+// - parse failure.
+//
+static bool tryParseDouble(const char *s, const char *s_end, double *result) {
+ if (s >= s_end) {
+ return false;
+ }
+
+ double mantissa = 0.0;
+ // This exponent is base 2 rather than 10.
+ // However the exponent we parse is supposed to be one of ten,
+ // thus we must take care to convert the exponent/and or the
+ // mantissa to a * 2^E, where a is the mantissa and E is the
+ // exponent.
+ // To get the final double we will use ldexp, it requires the
+ // exponent to be in base 2.
+ int exponent = 0;
+
+ // NOTE: THESE MUST BE DECLARED HERE SINCE WE ARE NOT ALLOWED
+ // TO JUMP OVER DEFINITIONS.
+ char sign = '+';
+ char exp_sign = '+';
+ char const *curr = s;
+
+ // How many characters were read in a loop.
+ int read = 0;
+ // Tells whether a loop terminated due to reaching s_end.
+ bool end_not_reached = false;
+ bool leading_decimal_dots = false;
+
+ /*
+ BEGIN PARSING.
+ */
+
+ // Find out what sign we've got.
+ if (*curr == '+' || *curr == '-') {
+ sign = *curr;
+ curr++;
+ if ((curr != s_end) && (*curr == '.')) {
+ // accept. Somethig like `.7e+2`, `-.5234`
+ leading_decimal_dots = true;
+ }
+ } else if (IS_DIGIT(*curr)) { /* Pass through. */
+ } else if (*curr == '.') {
+ // accept. Somethig like `.7e+2`, `-.5234`
+ leading_decimal_dots = true;
+ } else {
+ goto fail;
+ }
+
+ // Read the integer part.
+ end_not_reached = (curr != s_end);
+ if (!leading_decimal_dots) {
+ while (end_not_reached && IS_DIGIT(*curr)) {
+ mantissa *= 10;
+ mantissa += static_cast<int>(*curr - 0x30);
+ curr++;
+ read++;
+ end_not_reached = (curr != s_end);
+ }
+
+ // We must make sure we actually got something.
+ if (read == 0) goto fail;
+ }
+
+ // We allow numbers of form "#", "###" etc.
+ if (!end_not_reached) goto assemble;
+
+ // Read the decimal part.
+ if (*curr == '.') {
+ curr++;
+ read = 1;
+ end_not_reached = (curr != s_end);
+ while (end_not_reached && IS_DIGIT(*curr)) {
+ static const double pow_lut[] = {
+ 1.0, 0.1, 0.01, 0.001, 0.0001, 0.00001, 0.000001, 0.0000001,
+ };
+ const int lut_entries = sizeof pow_lut / sizeof pow_lut[0];
+
+ // NOTE: Don't use powf here, it will absolutely murder precision.
+ mantissa += static_cast<int>(*curr - 0x30) *
+ (read < lut_entries ? pow_lut[read] : std::pow(10.0, -read));
+ read++;
+ curr++;
+ end_not_reached = (curr != s_end);
+ }
+ } else if (*curr == 'e' || *curr == 'E') {
+ } else {
+ goto assemble;
+ }
+
+ if (!end_not_reached) goto assemble;
+
+ // Read the exponent part.
+ if (*curr == 'e' || *curr == 'E') {
+ curr++;
+ // Figure out if a sign is present and if it is.
+ end_not_reached = (curr != s_end);
+ if (end_not_reached && (*curr == '+' || *curr == '-')) {
+ exp_sign = *curr;
+ curr++;
+ } else if (IS_DIGIT(*curr)) { /* Pass through. */
+ } else {
+ // Empty E is not allowed.
+ goto fail;
+ }
+
+ read = 0;
+ end_not_reached = (curr != s_end);
+ while (end_not_reached && IS_DIGIT(*curr)) {
+ // To avoid annoying MSVC's min/max macro definiton,
+ // Use hardcoded int max value
+ if (exponent >
+ (2147483647 / 10)) { // 2147483647 = std::numeric_limits<int>::max()
+ // Integer overflow
+ goto fail;
+ }
+ exponent *= 10;
+ exponent += static_cast<int>(*curr - 0x30);
+ curr++;
+ read++;
+ end_not_reached = (curr != s_end);
+ }
+ exponent *= (exp_sign == '+' ? 1 : -1);
+ if (read == 0) goto fail;
+ }
+
+assemble:
+ *result = (sign == '+' ? 1 : -1) *
+ (exponent ? std::ldexp(mantissa * std::pow(5.0, exponent), exponent)
+ : mantissa);
+ return true;
+fail:
+ return false;
+}
+
+static inline real_t parseReal(const char **token, double default_value = 0.0) {
+ (*token) += strspn((*token), " \t");
+ const char *end = (*token) + strcspn((*token), " \t\r");
+ double val = default_value;
+ tryParseDouble((*token), end, &val);
+ real_t f = static_cast<real_t>(val);
+ (*token) = end;
+ return f;
+}
+
+static inline bool parseReal(const char **token, real_t *out) {
+ (*token) += strspn((*token), " \t");
+ const char *end = (*token) + strcspn((*token), " \t\r");
+ double val;
+ bool ret = tryParseDouble((*token), end, &val);
+ if (ret) {
+ real_t f = static_cast<real_t>(val);
+ (*out) = f;
+ }
+ (*token) = end;
+ return ret;
+}
+
+static inline void parseReal2(real_t *x, real_t *y, const char **token,
+ const double default_x = 0.0,
+ const double default_y = 0.0) {
+ (*x) = parseReal(token, default_x);
+ (*y) = parseReal(token, default_y);
+}
+
+static inline void parseReal3(real_t *x, real_t *y, real_t *z,
+ const char **token, const double default_x = 0.0,
+ const double default_y = 0.0,
+ const double default_z = 0.0) {
+ (*x) = parseReal(token, default_x);
+ (*y) = parseReal(token, default_y);
+ (*z) = parseReal(token, default_z);
+}
+
+#if 0 // not used
+static inline void parseV(real_t *x, real_t *y, real_t *z, real_t *w,
+ const char **token, const double default_x = 0.0,
+ const double default_y = 0.0,
+ const double default_z = 0.0,
+ const double default_w = 1.0) {
+ (*x) = parseReal(token, default_x);
+ (*y) = parseReal(token, default_y);
+ (*z) = parseReal(token, default_z);
+ (*w) = parseReal(token, default_w);
+}
+#endif
+
+// Extension: parse vertex with colors(6 items)
+// Return 3: xyz, 4: xyzw, 6: xyzrgb
+// `r`: red(case 6) or [w](case 4)
+static inline int parseVertexWithColor(real_t *x, real_t *y, real_t *z,
+ real_t *r, real_t *g, real_t *b,
+ const char **token,
+ const double default_x = 0.0,
+ const double default_y = 0.0,
+ const double default_z = 0.0) {
+ // TODO: Check error
+ (*x) = parseReal(token, default_x);
+ (*y) = parseReal(token, default_y);
+ (*z) = parseReal(token, default_z);
+
+ // - 4 components(x, y, z, w) ot 6 components
+ bool has_r = parseReal(token, r);
+
+ if (!has_r) {
+ (*r) = (*g) = (*b) = 1.0;
+ return 3;
+ }
+
+ bool has_g = parseReal(token, g);
+
+ if (!has_g) {
+ (*g) = (*b) = 1.0;
+ return 4;
+ }
+
+ bool has_b = parseReal(token, b);
+
+ if (!has_b) {
+ (*r) = (*g) = (*b) = 1.0;
+ return 3; // treated as xyz
+ }
+
+ return 6;
+}
+
+static inline bool parseOnOff(const char **token, bool default_value = true) {
+ (*token) += strspn((*token), " \t");
+ const char *end = (*token) + strcspn((*token), " \t\r");
+
+ bool ret = default_value;
+ if ((0 == strncmp((*token), "on", 2))) {
+ ret = true;
+ } else if ((0 == strncmp((*token), "off", 3))) {
+ ret = false;
+ }
+
+ (*token) = end;
+ return ret;
+}
+
+static inline texture_type_t parseTextureType(
+ const char **token, texture_type_t default_value = TEXTURE_TYPE_NONE) {
+ (*token) += strspn((*token), " \t");
+ const char *end = (*token) + strcspn((*token), " \t\r");
+ texture_type_t ty = default_value;
+
+ if ((0 == strncmp((*token), "cube_top", strlen("cube_top")))) {
+ ty = TEXTURE_TYPE_CUBE_TOP;
+ } else if ((0 == strncmp((*token), "cube_bottom", strlen("cube_bottom")))) {
+ ty = TEXTURE_TYPE_CUBE_BOTTOM;
+ } else if ((0 == strncmp((*token), "cube_left", strlen("cube_left")))) {
+ ty = TEXTURE_TYPE_CUBE_LEFT;
+ } else if ((0 == strncmp((*token), "cube_right", strlen("cube_right")))) {
+ ty = TEXTURE_TYPE_CUBE_RIGHT;
+ } else if ((0 == strncmp((*token), "cube_front", strlen("cube_front")))) {
+ ty = TEXTURE_TYPE_CUBE_FRONT;
+ } else if ((0 == strncmp((*token), "cube_back", strlen("cube_back")))) {
+ ty = TEXTURE_TYPE_CUBE_BACK;
+ } else if ((0 == strncmp((*token), "sphere", strlen("sphere")))) {
+ ty = TEXTURE_TYPE_SPHERE;
+ }
+
+ (*token) = end;
+ return ty;
+}
+
+static tag_sizes parseTagTriple(const char **token) {
+ tag_sizes ts;
+
+ (*token) += strspn((*token), " \t");
+ ts.num_ints = atoi((*token));
+ (*token) += strcspn((*token), "/ \t\r");
+ if ((*token)[0] != '/') {
+ return ts;
+ }
+
+ (*token)++; // Skip '/'
+
+ (*token) += strspn((*token), " \t");
+ ts.num_reals = atoi((*token));
+ (*token) += strcspn((*token), "/ \t\r");
+ if ((*token)[0] != '/') {
+ return ts;
+ }
+ (*token)++; // Skip '/'
+
+ ts.num_strings = parseInt(token);
+
+ return ts;
+}
+
+// Parse triples with index offsets: i, i/j/k, i//k, i/j
+static bool parseTriple(const char **token, int vsize, int vnsize, int vtsize,
+ vertex_index_t *ret, const warning_context &context) {
+ if (!ret) {
+ return false;
+ }
+
+ vertex_index_t vi(-1);
+
+ if (!fixIndex(atoi((*token)), vsize, &vi.v_idx, false, context)) {
+ return false;
+ }
+
+ (*token) += strcspn((*token), "/ \t\r");
+ if ((*token)[0] != '/') {
+ (*ret) = vi;
+ return true;
+ }
+ (*token)++;
+
+ // i//k
+ if ((*token)[0] == '/') {
+ (*token)++;
+ if (!fixIndex(atoi((*token)), vnsize, &vi.vn_idx, true, context)) {
+ return false;
+ }
+ (*token) += strcspn((*token), "/ \t\r");
+ (*ret) = vi;
+ return true;
+ }
+
+ // i/j/k or i/j
+ if (!fixIndex(atoi((*token)), vtsize, &vi.vt_idx, true, context)) {
+ return false;
+ }
+
+ (*token) += strcspn((*token), "/ \t\r");
+ if ((*token)[0] != '/') {
+ (*ret) = vi;
+ return true;
+ }
+
+ // i/j/k
+ (*token)++; // skip '/'
+ if (!fixIndex(atoi((*token)), vnsize, &vi.vn_idx, true, context)) {
+ return false;
+ }
+ (*token) += strcspn((*token), "/ \t\r");
+
+ (*ret) = vi;
+
+ return true;
+}
+
+// Parse raw triples: i, i/j/k, i//k, i/j
+static vertex_index_t parseRawTriple(const char **token) {
+ vertex_index_t vi(static_cast<int>(0)); // 0 is an invalid index in OBJ
+
+ vi.v_idx = atoi((*token));
+ (*token) += strcspn((*token), "/ \t\r");
+ if ((*token)[0] != '/') {
+ return vi;
+ }
+ (*token)++;
+
+ // i//k
+ if ((*token)[0] == '/') {
+ (*token)++;
+ vi.vn_idx = atoi((*token));
+ (*token) += strcspn((*token), "/ \t\r");
+ return vi;
+ }
+
+ // i/j/k or i/j
+ vi.vt_idx = atoi((*token));
+ (*token) += strcspn((*token), "/ \t\r");
+ if ((*token)[0] != '/') {
+ return vi;
+ }
+
+ // i/j/k
+ (*token)++; // skip '/'
+ vi.vn_idx = atoi((*token));
+ (*token) += strcspn((*token), "/ \t\r");
+ return vi;
+}
+
+bool ParseTextureNameAndOption(std::string *texname, texture_option_t *texopt,
+ const char *linebuf) {
+ // @todo { write more robust lexer and parser. }
+ bool found_texname = false;
+ std::string texture_name;
+
+ const char *token = linebuf; // Assume line ends with NULL
+
+ while (!IS_NEW_LINE((*token))) {
+ token += strspn(token, " \t"); // skip space
+ if ((0 == strncmp(token, "-blendu", 7)) && IS_SPACE((token[7]))) {
+ token += 8;
+ texopt->blendu = parseOnOff(&token, /* default */ true);
+ } else if ((0 == strncmp(token, "-blendv", 7)) && IS_SPACE((token[7]))) {
+ token += 8;
+ texopt->blendv = parseOnOff(&token, /* default */ true);
+ } else if ((0 == strncmp(token, "-clamp", 6)) && IS_SPACE((token[6]))) {
+ token += 7;
+ texopt->clamp = parseOnOff(&token, /* default */ true);
+ } else if ((0 == strncmp(token, "-boost", 6)) && IS_SPACE((token[6]))) {
+ token += 7;
+ texopt->sharpness = parseReal(&token, 1.0);
+ } else if ((0 == strncmp(token, "-bm", 3)) && IS_SPACE((token[3]))) {
+ token += 4;
+ texopt->bump_multiplier = parseReal(&token, 1.0);
+ } else if ((0 == strncmp(token, "-o", 2)) && IS_SPACE((token[2]))) {
+ token += 3;
+ parseReal3(&(texopt->origin_offset[0]), &(texopt->origin_offset[1]),
+ &(texopt->origin_offset[2]), &token);
+ } else if ((0 == strncmp(token, "-s", 2)) && IS_SPACE((token[2]))) {
+ token += 3;
+ parseReal3(&(texopt->scale[0]), &(texopt->scale[1]), &(texopt->scale[2]),
+ &token, 1.0, 1.0, 1.0);
+ } else if ((0 == strncmp(token, "-t", 2)) && IS_SPACE((token[2]))) {
+ token += 3;
+ parseReal3(&(texopt->turbulence[0]), &(texopt->turbulence[1]),
+ &(texopt->turbulence[2]), &token);
+ } else if ((0 == strncmp(token, "-type", 5)) && IS_SPACE((token[5]))) {
+ token += 5;
+ texopt->type = parseTextureType((&token), TEXTURE_TYPE_NONE);
+ } else if ((0 == strncmp(token, "-texres", 7)) && IS_SPACE((token[7]))) {
+ token += 7;
+ // TODO(syoyo): Check if arg is int type.
+ texopt->texture_resolution = parseInt(&token);
+ } else if ((0 == strncmp(token, "-imfchan", 8)) && IS_SPACE((token[8]))) {
+ token += 9;
+ token += strspn(token, " \t");
+ const char *end = token + strcspn(token, " \t\r");
+ if ((end - token) == 1) { // Assume one char for -imfchan
+ texopt->imfchan = (*token);
+ }
+ token = end;
+ } else if ((0 == strncmp(token, "-mm", 3)) && IS_SPACE((token[3]))) {
+ token += 4;
+ parseReal2(&(texopt->brightness), &(texopt->contrast), &token, 0.0, 1.0);
+ } else if ((0 == strncmp(token, "-colorspace", 11)) &&
+ IS_SPACE((token[11]))) {
+ token += 12;
+ texopt->colorspace = parseString(&token);
+ } else {
+// Assume texture filename
+#if 0
+ size_t len = strcspn(token, " \t\r"); // untile next space
+ texture_name = std::string(token, token + len);
+ token += len;
+
+ token += strspn(token, " \t"); // skip space
+#else
+ // Read filename until line end to parse filename containing whitespace
+ // TODO(syoyo): Support parsing texture option flag after the filename.
+ texture_name = std::string(token);
+ token += texture_name.length();
+#endif
+
+ found_texname = true;
+ }
+ }
+
+ if (found_texname) {
+ (*texname) = texture_name;
+ return true;
+ } else {
+ return false;
+ }
+}
+
+static void InitTexOpt(texture_option_t *texopt, const bool is_bump) {
+ if (is_bump) {
+ texopt->imfchan = 'l';
+ } else {
+ texopt->imfchan = 'm';
+ }
+ texopt->bump_multiplier = static_cast<real_t>(1.0);
+ texopt->clamp = false;
+ texopt->blendu = true;
+ texopt->blendv = true;
+ texopt->sharpness = static_cast<real_t>(1.0);
+ texopt->brightness = static_cast<real_t>(0.0);
+ texopt->contrast = static_cast<real_t>(1.0);
+ texopt->origin_offset[0] = static_cast<real_t>(0.0);
+ texopt->origin_offset[1] = static_cast<real_t>(0.0);
+ texopt->origin_offset[2] = static_cast<real_t>(0.0);
+ texopt->scale[0] = static_cast<real_t>(1.0);
+ texopt->scale[1] = static_cast<real_t>(1.0);
+ texopt->scale[2] = static_cast<real_t>(1.0);
+ texopt->turbulence[0] = static_cast<real_t>(0.0);
+ texopt->turbulence[1] = static_cast<real_t>(0.0);
+ texopt->turbulence[2] = static_cast<real_t>(0.0);
+ texopt->texture_resolution = -1;
+ texopt->type = TEXTURE_TYPE_NONE;
+}
+
+static void InitMaterial(material_t *material) {
+ InitTexOpt(&material->ambient_texopt, /* is_bump */ false);
+ InitTexOpt(&material->diffuse_texopt, /* is_bump */ false);
+ InitTexOpt(&material->specular_texopt, /* is_bump */ false);
+ InitTexOpt(&material->specular_highlight_texopt, /* is_bump */ false);
+ InitTexOpt(&material->bump_texopt, /* is_bump */ true);
+ InitTexOpt(&material->displacement_texopt, /* is_bump */ false);
+ InitTexOpt(&material->alpha_texopt, /* is_bump */ false);
+ InitTexOpt(&material->reflection_texopt, /* is_bump */ false);
+ InitTexOpt(&material->roughness_texopt, /* is_bump */ false);
+ InitTexOpt(&material->metallic_texopt, /* is_bump */ false);
+ InitTexOpt(&material->sheen_texopt, /* is_bump */ false);
+ InitTexOpt(&material->emissive_texopt, /* is_bump */ false);
+ InitTexOpt(&material->normal_texopt,
+ /* is_bump */ false); // @fixme { is_bump will be true? }
+ material->name = "";
+ material->ambient_texname = "";
+ material->diffuse_texname = "";
+ material->specular_texname = "";
+ material->specular_highlight_texname = "";
+ material->bump_texname = "";
+ material->displacement_texname = "";
+ material->reflection_texname = "";
+ material->alpha_texname = "";
+ for (int i = 0; i < 3; i++) {
+ material->ambient[i] = static_cast<real_t>(0.0);
+ material->diffuse[i] = static_cast<real_t>(0.0);
+ material->specular[i] = static_cast<real_t>(0.0);
+ material->transmittance[i] = static_cast<real_t>(0.0);
+ material->emission[i] = static_cast<real_t>(0.0);
+ }
+ material->illum = 0;
+ material->dissolve = static_cast<real_t>(1.0);
+ material->shininess = static_cast<real_t>(1.0);
+ material->ior = static_cast<real_t>(1.0);
+
+ material->roughness = static_cast<real_t>(0.0);
+ material->metallic = static_cast<real_t>(0.0);
+ material->sheen = static_cast<real_t>(0.0);
+ material->clearcoat_thickness = static_cast<real_t>(0.0);
+ material->clearcoat_roughness = static_cast<real_t>(0.0);
+ material->anisotropy_rotation = static_cast<real_t>(0.0);
+ material->anisotropy = static_cast<real_t>(0.0);
+ material->roughness_texname = "";
+ material->metallic_texname = "";
+ material->sheen_texname = "";
+ material->emissive_texname = "";
+ material->normal_texname = "";
+
+ material->unknown_parameter.clear();
+}
+
+// code from https://wrf.ecse.rpi.edu//Research/Short_Notes/pnpoly.html
+template <typename T>
+static int pnpoly(int nvert, T *vertx, T *verty, T testx, T testy) {
+ int i, j, c = 0;
+ for (i = 0, j = nvert - 1; i < nvert; j = i++) {
+ if (((verty[i] > testy) != (verty[j] > testy)) &&
+ (testx <
+ (vertx[j] - vertx[i]) * (testy - verty[i]) / (verty[j] - verty[i]) +
+ vertx[i]))
+ c = !c;
+ }
+ return c;
+}
+
+struct TinyObjPoint {
+ real_t x, y, z;
+ TinyObjPoint() : x(0), y(0), z(0) {}
+ TinyObjPoint(real_t x_, real_t y_, real_t z_) : x(x_), y(y_), z(z_) {}
+};
+
+inline TinyObjPoint cross(const TinyObjPoint &v1, const TinyObjPoint &v2) {
+ return TinyObjPoint(v1.y * v2.z - v1.z * v2.y, v1.z * v2.x - v1.x * v2.z,
+ v1.x * v2.y - v1.y * v2.x);
+}
+
+inline real_t dot(const TinyObjPoint &v1, const TinyObjPoint &v2) {
+ return (v1.x * v2.x + v1.y * v2.y + v1.z * v2.z);
+}
+
+inline real_t GetLength(TinyObjPoint &e) {
+ return std::sqrt(e.x * e.x + e.y * e.y + e.z * e.z);
+}
+
+inline TinyObjPoint Normalize(TinyObjPoint e) {
+ real_t inv_length = real_t(1) / GetLength(e);
+ return TinyObjPoint(e.x * inv_length, e.y * inv_length, e.z * inv_length);
+}
+
+inline TinyObjPoint WorldToLocal(const TinyObjPoint &a, const TinyObjPoint &u,
+ const TinyObjPoint &v, const TinyObjPoint &w) {
+ return TinyObjPoint(dot(a, u), dot(a, v), dot(a, w));
+}
+
+// TODO(syoyo): refactor function.
+static bool exportGroupsToShape(shape_t *shape, const PrimGroup &prim_group,
+ const std::vector<tag_t> &tags,
+ const int material_id, const std::string &name,
+ bool triangulate, const std::vector<real_t> &v,
+ std::string *warn) {
+ if (prim_group.IsEmpty()) {
+ return false;
+ }
+
+ shape->name = name;
+
+ // polygon
+ if (!prim_group.faceGroup.empty()) {
+ // Flatten vertices and indices
+ for (size_t i = 0; i < prim_group.faceGroup.size(); i++) {
+ const face_t &face = prim_group.faceGroup[i];
+
+ size_t npolys = face.vertex_indices.size();
+
+ if (npolys < 3) {
+ // Face must have 3+ vertices.
+ if (warn) {
+ (*warn) += "Degenerated face found\n.";
+ }
+ continue;
+ }
+
+ if (triangulate && npolys != 3) {
+ if (npolys == 4) {
+ vertex_index_t i0 = face.vertex_indices[0];
+ vertex_index_t i1 = face.vertex_indices[1];
+ vertex_index_t i2 = face.vertex_indices[2];
+ vertex_index_t i3 = face.vertex_indices[3];
+
+ size_t vi0 = size_t(i0.v_idx);
+ size_t vi1 = size_t(i1.v_idx);
+ size_t vi2 = size_t(i2.v_idx);
+ size_t vi3 = size_t(i3.v_idx);
+
+ if (((3 * vi0 + 2) >= v.size()) || ((3 * vi1 + 2) >= v.size()) ||
+ ((3 * vi2 + 2) >= v.size()) || ((3 * vi3 + 2) >= v.size())) {
+ // Invalid triangle.
+ // FIXME(syoyo): Is it ok to simply skip this invalid triangle?
+ if (warn) {
+ (*warn) += "Face with invalid vertex index found.\n";
+ }
+ continue;
+ }
+
+ real_t v0x = v[vi0 * 3 + 0];
+ real_t v0y = v[vi0 * 3 + 1];
+ real_t v0z = v[vi0 * 3 + 2];
+ real_t v1x = v[vi1 * 3 + 0];
+ real_t v1y = v[vi1 * 3 + 1];
+ real_t v1z = v[vi1 * 3 + 2];
+ real_t v2x = v[vi2 * 3 + 0];
+ real_t v2y = v[vi2 * 3 + 1];
+ real_t v2z = v[vi2 * 3 + 2];
+ real_t v3x = v[vi3 * 3 + 0];
+ real_t v3y = v[vi3 * 3 + 1];
+ real_t v3z = v[vi3 * 3 + 2];
+
+ // There are two candidates to split the quad into two triangles.
+ //
+ // Choose the shortest edge.
+ // TODO: Is it better to determine the edge to split by calculating
+ // the area of each triangle?
+ //
+ // +---+
+ // |\ |
+ // | \ |
+ // | \|
+ // +---+
+ //
+ // +---+
+ // | /|
+ // | / |
+ // |/ |
+ // +---+
+
+ real_t e02x = v2x - v0x;
+ real_t e02y = v2y - v0y;
+ real_t e02z = v2z - v0z;
+ real_t e13x = v3x - v1x;
+ real_t e13y = v3y - v1y;
+ real_t e13z = v3z - v1z;
+
+ real_t sqr02 = e02x * e02x + e02y * e02y + e02z * e02z;
+ real_t sqr13 = e13x * e13x + e13y * e13y + e13z * e13z;
+
+ index_t idx0, idx1, idx2, idx3;
+
+ idx0.vertex_index = i0.v_idx;
+ idx0.normal_index = i0.vn_idx;
+ idx0.texcoord_index = i0.vt_idx;
+ idx1.vertex_index = i1.v_idx;
+ idx1.normal_index = i1.vn_idx;
+ idx1.texcoord_index = i1.vt_idx;
+ idx2.vertex_index = i2.v_idx;
+ idx2.normal_index = i2.vn_idx;
+ idx2.texcoord_index = i2.vt_idx;
+ idx3.vertex_index = i3.v_idx;
+ idx3.normal_index = i3.vn_idx;
+ idx3.texcoord_index = i3.vt_idx;
+
+ if (sqr02 < sqr13) {
+ // [0, 1, 2], [0, 2, 3]
+ shape->mesh.indices.push_back(idx0);
+ shape->mesh.indices.push_back(idx1);
+ shape->mesh.indices.push_back(idx2);
+
+ shape->mesh.indices.push_back(idx0);
+ shape->mesh.indices.push_back(idx2);
+ shape->mesh.indices.push_back(idx3);
+ } else {
+ // [0, 1, 3], [1, 2, 3]
+ shape->mesh.indices.push_back(idx0);
+ shape->mesh.indices.push_back(idx1);
+ shape->mesh.indices.push_back(idx3);
+
+ shape->mesh.indices.push_back(idx1);
+ shape->mesh.indices.push_back(idx2);
+ shape->mesh.indices.push_back(idx3);
+ }
+
+ // Two triangle faces
+ shape->mesh.num_face_vertices.push_back(3);
+ shape->mesh.num_face_vertices.push_back(3);
+
+ shape->mesh.material_ids.push_back(material_id);
+ shape->mesh.material_ids.push_back(material_id);
+
+ shape->mesh.smoothing_group_ids.push_back(face.smoothing_group_id);
+ shape->mesh.smoothing_group_ids.push_back(face.smoothing_group_id);
+
+ } else {
+#ifdef TINYOBJLOADER_USE_MAPBOX_EARCUT
+ vertex_index_t i0 = face.vertex_indices[0];
+ vertex_index_t i0_2 = i0;
+
+ // TMW change: Find the normal axis of the polygon using Newell's
+ // method
+ TinyObjPoint n;
+ for (size_t k = 0; k < npolys; ++k) {
+ i0 = face.vertex_indices[k % npolys];
+ size_t vi0 = size_t(i0.v_idx);
+
+ size_t j = (k + 1) % npolys;
+ i0_2 = face.vertex_indices[j];
+ size_t vi0_2 = size_t(i0_2.v_idx);
+
+ real_t v0x = v[vi0 * 3 + 0];
+ real_t v0y = v[vi0 * 3 + 1];
+ real_t v0z = v[vi0 * 3 + 2];
+
+ real_t v0x_2 = v[vi0_2 * 3 + 0];
+ real_t v0y_2 = v[vi0_2 * 3 + 1];
+ real_t v0z_2 = v[vi0_2 * 3 + 2];
+
+ const TinyObjPoint point1(v0x, v0y, v0z);
+ const TinyObjPoint point2(v0x_2, v0y_2, v0z_2);
+
+ TinyObjPoint a(point1.x - point2.x, point1.y - point2.y,
+ point1.z - point2.z);
+ TinyObjPoint b(point1.x + point2.x, point1.y + point2.y,
+ point1.z + point2.z);
+
+ n.x += (a.y * b.z);
+ n.y += (a.z * b.x);
+ n.z += (a.x * b.y);
+ }
+ real_t length_n = GetLength(n);
+ // Check if zero length normal
+ if (length_n <= 0) {
+ continue;
+ }
+ // Negative is to flip the normal to the correct direction
+ real_t inv_length = -real_t(1.0) / length_n;
+ n.x *= inv_length;
+ n.y *= inv_length;
+ n.z *= inv_length;
+
+ TinyObjPoint axis_w, axis_v, axis_u;
+ axis_w = n;
+ TinyObjPoint a;
+ if (std::fabs(axis_w.x) > real_t(0.9999999)) {
+ a = TinyObjPoint(0, 1, 0);
+ } else {
+ a = TinyObjPoint(1, 0, 0);
+ }
+ axis_v = Normalize(cross(axis_w, a));
+ axis_u = cross(axis_w, axis_v);
+ using Point = std::array<real_t, 2>;
+
+ // first polyline define the main polygon.
+ // following polylines define holes(not used in tinyobj).
+ std::vector<std::vector<Point> > polygon;
+
+ std::vector<Point> polyline;
+
+ // TMW change: Find best normal and project v0x and v0y to those
+ // coordinates, instead of picking a plane aligned with an axis (which
+ // can flip polygons).
+
+ // Fill polygon data(facevarying vertices).
+ for (size_t k = 0; k < npolys; k++) {
+ i0 = face.vertex_indices[k];
+ size_t vi0 = size_t(i0.v_idx);
+
+ assert(((3 * vi0 + 2) < v.size()));
+
+ real_t v0x = v[vi0 * 3 + 0];
+ real_t v0y = v[vi0 * 3 + 1];
+ real_t v0z = v[vi0 * 3 + 2];
+
+ TinyObjPoint polypoint(v0x, v0y, v0z);
+ TinyObjPoint loc = WorldToLocal(polypoint, axis_u, axis_v, axis_w);
+
+ polyline.push_back({loc.x, loc.y});
+ }
+
+ polygon.push_back(polyline);
+ std::vector<uint32_t> indices = mapbox::earcut<uint32_t>(polygon);
+ // => result = 3 * faces, clockwise
+
+ assert(indices.size() % 3 == 0);
+
+ // Reconstruct vertex_index_t
+ for (size_t k = 0; k < indices.size() / 3; k++) {
+ {
+ index_t idx0, idx1, idx2;
+ idx0.vertex_index = face.vertex_indices[indices[3 * k + 0]].v_idx;
+ idx0.normal_index =
+ face.vertex_indices[indices[3 * k + 0]].vn_idx;
+ idx0.texcoord_index =
+ face.vertex_indices[indices[3 * k + 0]].vt_idx;
+ idx1.vertex_index = face.vertex_indices[indices[3 * k + 1]].v_idx;
+ idx1.normal_index =
+ face.vertex_indices[indices[3 * k + 1]].vn_idx;
+ idx1.texcoord_index =
+ face.vertex_indices[indices[3 * k + 1]].vt_idx;
+ idx2.vertex_index = face.vertex_indices[indices[3 * k + 2]].v_idx;
+ idx2.normal_index =
+ face.vertex_indices[indices[3 * k + 2]].vn_idx;
+ idx2.texcoord_index =
+ face.vertex_indices[indices[3 * k + 2]].vt_idx;
+
+ shape->mesh.indices.push_back(idx0);
+ shape->mesh.indices.push_back(idx1);
+ shape->mesh.indices.push_back(idx2);
+
+ shape->mesh.num_face_vertices.push_back(3);
+ shape->mesh.material_ids.push_back(material_id);
+ shape->mesh.smoothing_group_ids.push_back(
+ face.smoothing_group_id);
+ }
+ }
+
+#else // Built-in ear clipping triangulation
+ vertex_index_t i0 = face.vertex_indices[0];
+ vertex_index_t i1(-1);
+ vertex_index_t i2 = face.vertex_indices[1];
+
+ // find the two axes to work in
+ size_t axes[2] = {1, 2};
+ for (size_t k = 0; k < npolys; ++k) {
+ i0 = face.vertex_indices[(k + 0) % npolys];
+ i1 = face.vertex_indices[(k + 1) % npolys];
+ i2 = face.vertex_indices[(k + 2) % npolys];
+ size_t vi0 = size_t(i0.v_idx);
+ size_t vi1 = size_t(i1.v_idx);
+ size_t vi2 = size_t(i2.v_idx);
+
+ if (((3 * vi0 + 2) >= v.size()) || ((3 * vi1 + 2) >= v.size()) ||
+ ((3 * vi2 + 2) >= v.size())) {
+ // Invalid triangle.
+ // FIXME(syoyo): Is it ok to simply skip this invalid triangle?
+ continue;
+ }
+ real_t v0x = v[vi0 * 3 + 0];
+ real_t v0y = v[vi0 * 3 + 1];
+ real_t v0z = v[vi0 * 3 + 2];
+ real_t v1x = v[vi1 * 3 + 0];
+ real_t v1y = v[vi1 * 3 + 1];
+ real_t v1z = v[vi1 * 3 + 2];
+ real_t v2x = v[vi2 * 3 + 0];
+ real_t v2y = v[vi2 * 3 + 1];
+ real_t v2z = v[vi2 * 3 + 2];
+ real_t e0x = v1x - v0x;
+ real_t e0y = v1y - v0y;
+ real_t e0z = v1z - v0z;
+ real_t e1x = v2x - v1x;
+ real_t e1y = v2y - v1y;
+ real_t e1z = v2z - v1z;
+ real_t cx = std::fabs(e0y * e1z - e0z * e1y);
+ real_t cy = std::fabs(e0z * e1x - e0x * e1z);
+ real_t cz = std::fabs(e0x * e1y - e0y * e1x);
+ const real_t epsilon = std::numeric_limits<real_t>::epsilon();
+ // std::cout << "cx " << cx << ", cy " << cy << ", cz " << cz <<
+ // "\n";
+ if (cx > epsilon || cy > epsilon || cz > epsilon) {
+ // std::cout << "corner\n";
+ // found a corner
+ if (cx > cy && cx > cz) {
+ // std::cout << "pattern0\n";
+ } else {
+ // std::cout << "axes[0] = 0\n";
+ axes[0] = 0;
+ if (cz > cx && cz > cy) {
+ // std::cout << "axes[1] = 1\n";
+ axes[1] = 1;
+ }
+ }
+ break;
+ }
+ }
+
+ face_t remainingFace = face; // copy
+ size_t guess_vert = 0;
+ vertex_index_t ind[3];
+ real_t vx[3];
+ real_t vy[3];
+
+ // How many iterations can we do without decreasing the remaining
+ // vertices.
+ size_t remainingIterations = face.vertex_indices.size();
+ size_t previousRemainingVertices =
+ remainingFace.vertex_indices.size();
+
+ while (remainingFace.vertex_indices.size() > 3 &&
+ remainingIterations > 0) {
+ // std::cout << "remainingIterations " << remainingIterations <<
+ // "\n";
+
+ npolys = remainingFace.vertex_indices.size();
+ if (guess_vert >= npolys) {
+ guess_vert -= npolys;
+ }
+
+ if (previousRemainingVertices != npolys) {
+ // The number of remaining vertices decreased. Reset counters.
+ previousRemainingVertices = npolys;
+ remainingIterations = npolys;
+ } else {
+ // We didn't consume a vertex on previous iteration, reduce the
+ // available iterations.
+ remainingIterations--;
+ }
+
+ for (size_t k = 0; k < 3; k++) {
+ ind[k] = remainingFace.vertex_indices[(guess_vert + k) % npolys];
+ size_t vi = size_t(ind[k].v_idx);
+ if (((vi * 3 + axes[0]) >= v.size()) ||
+ ((vi * 3 + axes[1]) >= v.size())) {
+ // ???
+ vx[k] = static_cast<real_t>(0.0);
+ vy[k] = static_cast<real_t>(0.0);
+ } else {
+ vx[k] = v[vi * 3 + axes[0]];
+ vy[k] = v[vi * 3 + axes[1]];
+ }
+ }
+
+ //
+ // area is calculated per face
+ //
+ real_t e0x = vx[1] - vx[0];
+ real_t e0y = vy[1] - vy[0];
+ real_t e1x = vx[2] - vx[1];
+ real_t e1y = vy[2] - vy[1];
+ real_t cross = e0x * e1y - e0y * e1x;
+ // std::cout << "axes = " << axes[0] << ", " << axes[1] << "\n";
+ // std::cout << "e0x, e0y, e1x, e1y " << e0x << ", " << e0y << ", "
+ // << e1x << ", " << e1y << "\n";
+
+ real_t area =
+ (vx[0] * vy[1] - vy[0] * vx[1]) * static_cast<real_t>(0.5);
+ // std::cout << "cross " << cross << ", area " << area << "\n";
+ // if an internal angle
+ if (cross * area < static_cast<real_t>(0.0)) {
+ // std::cout << "internal \n";
+ guess_vert += 1;
+ // std::cout << "guess vert : " << guess_vert << "\n";
+ continue;
+ }
+
+ // check all other verts in case they are inside this triangle
+ bool overlap = false;
+ for (size_t otherVert = 3; otherVert < npolys; ++otherVert) {
+ size_t idx = (guess_vert + otherVert) % npolys;
+
+ if (idx >= remainingFace.vertex_indices.size()) {
+ // std::cout << "???0\n";
+ // ???
+ continue;
+ }
+
+ size_t ovi = size_t(remainingFace.vertex_indices[idx].v_idx);
+
+ if (((ovi * 3 + axes[0]) >= v.size()) ||
+ ((ovi * 3 + axes[1]) >= v.size())) {
+ // std::cout << "???1\n";
+ // ???
+ continue;
+ }
+ real_t tx = v[ovi * 3 + axes[0]];
+ real_t ty = v[ovi * 3 + axes[1]];
+ if (pnpoly(3, vx, vy, tx, ty)) {
+ // std::cout << "overlap\n";
+ overlap = true;
+ break;
+ }
+ }
+
+ if (overlap) {
+ // std::cout << "overlap2\n";
+ guess_vert += 1;
+ continue;
+ }
+
+ // this triangle is an ear
+ {
+ index_t idx0, idx1, idx2;
+ idx0.vertex_index = ind[0].v_idx;
+ idx0.normal_index = ind[0].vn_idx;
+ idx0.texcoord_index = ind[0].vt_idx;
+ idx1.vertex_index = ind[1].v_idx;
+ idx1.normal_index = ind[1].vn_idx;
+ idx1.texcoord_index = ind[1].vt_idx;
+ idx2.vertex_index = ind[2].v_idx;
+ idx2.normal_index = ind[2].vn_idx;
+ idx2.texcoord_index = ind[2].vt_idx;
+
+ shape->mesh.indices.push_back(idx0);
+ shape->mesh.indices.push_back(idx1);
+ shape->mesh.indices.push_back(idx2);
+
+ shape->mesh.num_face_vertices.push_back(3);
+ shape->mesh.material_ids.push_back(material_id);
+ shape->mesh.smoothing_group_ids.push_back(
+ face.smoothing_group_id);
+ }
+
+ // remove v1 from the list
+ size_t removed_vert_index = (guess_vert + 1) % npolys;
+ while (removed_vert_index + 1 < npolys) {
+ remainingFace.vertex_indices[removed_vert_index] =
+ remainingFace.vertex_indices[removed_vert_index + 1];
+ removed_vert_index += 1;
+ }
+ remainingFace.vertex_indices.pop_back();
+ }
+
+ // std::cout << "remainingFace.vi.size = " <<
+ // remainingFace.vertex_indices.size() << "\n";
+ if (remainingFace.vertex_indices.size() == 3) {
+ i0 = remainingFace.vertex_indices[0];
+ i1 = remainingFace.vertex_indices[1];
+ i2 = remainingFace.vertex_indices[2];
+ {
+ index_t idx0, idx1, idx2;
+ idx0.vertex_index = i0.v_idx;
+ idx0.normal_index = i0.vn_idx;
+ idx0.texcoord_index = i0.vt_idx;
+ idx1.vertex_index = i1.v_idx;
+ idx1.normal_index = i1.vn_idx;
+ idx1.texcoord_index = i1.vt_idx;
+ idx2.vertex_index = i2.v_idx;
+ idx2.normal_index = i2.vn_idx;
+ idx2.texcoord_index = i2.vt_idx;
+
+ shape->mesh.indices.push_back(idx0);
+ shape->mesh.indices.push_back(idx1);
+ shape->mesh.indices.push_back(idx2);
+
+ shape->mesh.num_face_vertices.push_back(3);
+ shape->mesh.material_ids.push_back(material_id);
+ shape->mesh.smoothing_group_ids.push_back(
+ face.smoothing_group_id);
+ }
+ }
+#endif
+ } // npolys
+ } else {
+ for (size_t k = 0; k < npolys; k++) {
+ index_t idx;
+ idx.vertex_index = face.vertex_indices[k].v_idx;
+ idx.normal_index = face.vertex_indices[k].vn_idx;
+ idx.texcoord_index = face.vertex_indices[k].vt_idx;
+ shape->mesh.indices.push_back(idx);
+ }
+
+ shape->mesh.num_face_vertices.push_back(
+ static_cast<unsigned int>(npolys));
+ shape->mesh.material_ids.push_back(material_id); // per face
+ shape->mesh.smoothing_group_ids.push_back(
+ face.smoothing_group_id); // per face
+ }
+ }
+
+ shape->mesh.tags = tags;
+ }
+
+ // line
+ if (!prim_group.lineGroup.empty()) {
+ // Flatten indices
+ for (size_t i = 0; i < prim_group.lineGroup.size(); i++) {
+ for (size_t j = 0; j < prim_group.lineGroup[i].vertex_indices.size();
+ j++) {
+ const vertex_index_t &vi = prim_group.lineGroup[i].vertex_indices[j];
+
+ index_t idx;
+ idx.vertex_index = vi.v_idx;
+ idx.normal_index = vi.vn_idx;
+ idx.texcoord_index = vi.vt_idx;
+
+ shape->lines.indices.push_back(idx);
+ }
+
+ shape->lines.num_line_vertices.push_back(
+ int(prim_group.lineGroup[i].vertex_indices.size()));
+ }
+ }
+
+ // points
+ if (!prim_group.pointsGroup.empty()) {
+ // Flatten & convert indices
+ for (size_t i = 0; i < prim_group.pointsGroup.size(); i++) {
+ for (size_t j = 0; j < prim_group.pointsGroup[i].vertex_indices.size();
+ j++) {
+ const vertex_index_t &vi = prim_group.pointsGroup[i].vertex_indices[j];
+
+ index_t idx;
+ idx.vertex_index = vi.v_idx;
+ idx.normal_index = vi.vn_idx;
+ idx.texcoord_index = vi.vt_idx;
+
+ shape->points.indices.push_back(idx);
+ }
+ }
+ }
+
+ return true;
+}
+
+// Split a string with specified delimiter character and escape character.
+// https://rosettacode.org/wiki/Tokenize_a_string_with_escaping#C.2B.2B
+static void SplitString(const std::string &s, char delim, char escape,
+ std::vector<std::string> &elems) {
+ std::string token;
+
+ bool escaping = false;
+ for (size_t i = 0; i < s.size(); ++i) {
+ char ch = s[i];
+ if (escaping) {
+ escaping = false;
+ } else if (ch == escape) {
+ escaping = true;
+ continue;
+ } else if (ch == delim) {
+ if (!token.empty()) {
+ elems.push_back(token);
+ }
+ token.clear();
+ continue;
+ }
+ token += ch;
+ }
+
+ elems.push_back(token);
+}
+
+static std::string JoinPath(const std::string &dir,
+ const std::string &filename) {
+ if (dir.empty()) {
+ return filename;
+ } else {
+ // check '/'
+ char lastChar = *dir.rbegin();
+ if (lastChar != '/') {
+ return dir + std::string("/") + filename;
+ } else {
+ return dir + filename;
+ }
+ }
+}
+
+void LoadMtl(std::map<std::string, int> *material_map,
+ std::vector<material_t> *materials, std::istream *inStream,
+ std::string *warning, std::string *err) {
+ (void)err;
+
+ // Create a default material anyway.
+ material_t material;
+ InitMaterial(&material);
+
+ // Issue 43. `d` wins against `Tr` since `Tr` is not in the MTL specification.
+ bool has_d = false;
+ bool has_tr = false;
+
+ // has_kd is used to set a default diffuse value when map_Kd is present
+ // and Kd is not.
+ bool has_kd = false;
+
+ std::stringstream warn_ss;
+
+ size_t line_no = 0;
+ std::string linebuf;
+ while (inStream->peek() != -1) {
+ safeGetline(*inStream, linebuf);
+ line_no++;
+
+ // Trim trailing whitespace.
+ if (linebuf.size() > 0) {
+ linebuf = linebuf.substr(0, linebuf.find_last_not_of(" \t") + 1);
+ }
+
+ // Trim newline '\r\n' or '\n'
+ if (linebuf.size() > 0) {
+ if (linebuf[linebuf.size() - 1] == '\n')
+ linebuf.erase(linebuf.size() - 1);
+ }
+ if (linebuf.size() > 0) {
+ if (linebuf[linebuf.size() - 1] == '\r')
+ linebuf.erase(linebuf.size() - 1);
+ }
+
+ // Skip if empty line.
+ if (linebuf.empty()) {
+ continue;
+ }
+
+ // Skip leading space.
+ const char *token = linebuf.c_str();
+ token += strspn(token, " \t");
+
+ assert(token);
+ if (token[0] == '\0') continue; // empty line
+
+ if (token[0] == '#') continue; // comment line
+
+ // new mtl
+ if ((0 == strncmp(token, "newmtl", 6)) && IS_SPACE((token[6]))) {
+ // flush previous material.
+ if (!material.name.empty()) {
+ material_map->insert(std::pair<std::string, int>(
+ material.name, static_cast<int>(materials->size())));
+ materials->push_back(material);
+ }
+
+ // initial temporary material
+ InitMaterial(&material);
+
+ has_d = false;
+ has_tr = false;
+ has_kd = false;
+
+ // set new mtl name
+ token += 7;
+ {
+ std::string namebuf = parseString(&token);
+ // TODO: empty name check?
+ if (namebuf.empty()) {
+ if (warning) {
+ (*warning) += "empty material name in `newmtl`\n";
+ }
+ }
+ material.name = namebuf;
+ }
+ continue;
+ }
+
+ // ambient
+ if (token[0] == 'K' && token[1] == 'a' && IS_SPACE((token[2]))) {
+ token += 2;
+ real_t r, g, b;
+ parseReal3(&r, &g, &b, &token);
+ material.ambient[0] = r;
+ material.ambient[1] = g;
+ material.ambient[2] = b;
+ continue;
+ }
+
+ // diffuse
+ if (token[0] == 'K' && token[1] == 'd' && IS_SPACE((token[2]))) {
+ token += 2;
+ real_t r, g, b;
+ parseReal3(&r, &g, &b, &token);
+ material.diffuse[0] = r;
+ material.diffuse[1] = g;
+ material.diffuse[2] = b;
+ has_kd = true;
+ continue;
+ }
+
+ // specular
+ if (token[0] == 'K' && token[1] == 's' && IS_SPACE((token[2]))) {
+ token += 2;
+ real_t r, g, b;
+ parseReal3(&r, &g, &b, &token);
+ material.specular[0] = r;
+ material.specular[1] = g;
+ material.specular[2] = b;
+ continue;
+ }
+
+ // transmittance
+ if ((token[0] == 'K' && token[1] == 't' && IS_SPACE((token[2]))) ||
+ (token[0] == 'T' && token[1] == 'f' && IS_SPACE((token[2])))) {
+ token += 2;
+ real_t r, g, b;
+ parseReal3(&r, &g, &b, &token);
+ material.transmittance[0] = r;
+ material.transmittance[1] = g;
+ material.transmittance[2] = b;
+ continue;
+ }
+
+ // ior(index of refraction)
+ if (token[0] == 'N' && token[1] == 'i' && IS_SPACE((token[2]))) {
+ token += 2;
+ material.ior = parseReal(&token);
+ continue;
+ }
+
+ // emission
+ if (token[0] == 'K' && token[1] == 'e' && IS_SPACE(token[2])) {
+ token += 2;
+ real_t r, g, b;
+ parseReal3(&r, &g, &b, &token);
+ material.emission[0] = r;
+ material.emission[1] = g;
+ material.emission[2] = b;
+ continue;
+ }
+
+ // shininess
+ if (token[0] == 'N' && token[1] == 's' && IS_SPACE(token[2])) {
+ token += 2;
+ material.shininess = parseReal(&token);
+ continue;
+ }
+
+ // illum model
+ if (0 == strncmp(token, "illum", 5) && IS_SPACE(token[5])) {
+ token += 6;
+ material.illum = parseInt(&token);
+ continue;
+ }
+
+ // dissolve
+ if ((token[0] == 'd' && IS_SPACE(token[1]))) {
+ token += 1;
+ material.dissolve = parseReal(&token);
+
+ if (has_tr) {
+ warn_ss << "Both `d` and `Tr` parameters defined for \""
+ << material.name
+ << "\". Use the value of `d` for dissolve (line " << line_no
+ << " in .mtl.)\n";
+ }
+ has_d = true;
+ continue;
+ }
+ if (token[0] == 'T' && token[1] == 'r' && IS_SPACE(token[2])) {
+ token += 2;
+ if (has_d) {
+ // `d` wins. Ignore `Tr` value.
+ warn_ss << "Both `d` and `Tr` parameters defined for \""
+ << material.name
+ << "\". Use the value of `d` for dissolve (line " << line_no
+ << " in .mtl.)\n";
+ } else {
+ // We invert value of Tr(assume Tr is in range [0, 1])
+ // NOTE: Interpretation of Tr is application(exporter) dependent. For
+ // some application(e.g. 3ds max obj exporter), Tr = d(Issue 43)
+ material.dissolve = static_cast<real_t>(1.0) - parseReal(&token);
+ }
+ has_tr = true;
+ continue;
+ }
+
+ // PBR: roughness
+ if (token[0] == 'P' && token[1] == 'r' && IS_SPACE(token[2])) {
+ token += 2;
+ material.roughness = parseReal(&token);
+ continue;
+ }
+
+ // PBR: metallic
+ if (token[0] == 'P' && token[1] == 'm' && IS_SPACE(token[2])) {
+ token += 2;
+ material.metallic = parseReal(&token);
+ continue;
+ }
+
+ // PBR: sheen
+ if (token[0] == 'P' && token[1] == 's' && IS_SPACE(token[2])) {
+ token += 2;
+ material.sheen = parseReal(&token);
+ continue;
+ }
+
+ // PBR: clearcoat thickness
+ if (token[0] == 'P' && token[1] == 'c' && IS_SPACE(token[2])) {
+ token += 2;
+ material.clearcoat_thickness = parseReal(&token);
+ continue;
+ }
+
+ // PBR: clearcoat roughness
+ if ((0 == strncmp(token, "Pcr", 3)) && IS_SPACE(token[3])) {
+ token += 4;
+ material.clearcoat_roughness = parseReal(&token);
+ continue;
+ }
+
+ // PBR: anisotropy
+ if ((0 == strncmp(token, "aniso", 5)) && IS_SPACE(token[5])) {
+ token += 6;
+ material.anisotropy = parseReal(&token);
+ continue;
+ }
+
+ // PBR: anisotropy rotation
+ if ((0 == strncmp(token, "anisor", 6)) && IS_SPACE(token[6])) {
+ token += 7;
+ material.anisotropy_rotation = parseReal(&token);
+ continue;
+ }
+
+ // ambient or ambient occlusion texture
+ if ((0 == strncmp(token, "map_Ka", 6)) && IS_SPACE(token[6])) {
+ token += 7;
+ ParseTextureNameAndOption(&(material.ambient_texname),
+ &(material.ambient_texopt), token);
+ continue;
+ }
+
+ // diffuse texture
+ if ((0 == strncmp(token, "map_Kd", 6)) && IS_SPACE(token[6])) {
+ token += 7;
+ ParseTextureNameAndOption(&(material.diffuse_texname),
+ &(material.diffuse_texopt), token);
+
+ // Set a decent diffuse default value if a diffuse texture is specified
+ // without a matching Kd value.
+ if (!has_kd) {
+ material.diffuse[0] = static_cast<real_t>(0.6);
+ material.diffuse[1] = static_cast<real_t>(0.6);
+ material.diffuse[2] = static_cast<real_t>(0.6);
+ }
+
+ continue;
+ }
+
+ // specular texture
+ if ((0 == strncmp(token, "map_Ks", 6)) && IS_SPACE(token[6])) {
+ token += 7;
+ ParseTextureNameAndOption(&(material.specular_texname),
+ &(material.specular_texopt), token);
+ continue;
+ }
+
+ // specular highlight texture
+ if ((0 == strncmp(token, "map_Ns", 6)) && IS_SPACE(token[6])) {
+ token += 7;
+ ParseTextureNameAndOption(&(material.specular_highlight_texname),
+ &(material.specular_highlight_texopt), token);
+ continue;
+ }
+
+ // bump texture
+ if (((0 == strncmp(token, "map_bump", 8)) ||
+ (0 == strncmp(token, "map_Bump", 8))) &&
+ IS_SPACE(token[8])) {
+ token += 9;
+ ParseTextureNameAndOption(&(material.bump_texname),
+ &(material.bump_texopt), token);
+ continue;
+ }
+
+ // bump texture
+ if ((0 == strncmp(token, "bump", 4)) && IS_SPACE(token[4])) {
+ token += 5;
+ ParseTextureNameAndOption(&(material.bump_texname),
+ &(material.bump_texopt), token);
+ continue;
+ }
+
+ // alpha texture
+ if ((0 == strncmp(token, "map_d", 5)) && IS_SPACE(token[5])) {
+ token += 6;
+ material.alpha_texname = token;
+ ParseTextureNameAndOption(&(material.alpha_texname),
+ &(material.alpha_texopt), token);
+ continue;
+ }
+
+ // displacement texture
+ if (((0 == strncmp(token, "map_disp", 8)) ||
+ (0 == strncmp(token, "map_Disp", 8))) &&
+ IS_SPACE(token[8])) {
+ token += 9;
+ ParseTextureNameAndOption(&(material.displacement_texname),
+ &(material.displacement_texopt), token);
+ continue;
+ }
+
+ // displacement texture
+ if ((0 == strncmp(token, "disp", 4)) && IS_SPACE(token[4])) {
+ token += 5;
+ ParseTextureNameAndOption(&(material.displacement_texname),
+ &(material.displacement_texopt), token);
+ continue;
+ }
+
+ // reflection map
+ if ((0 == strncmp(token, "refl", 4)) && IS_SPACE(token[4])) {
+ token += 5;
+ ParseTextureNameAndOption(&(material.reflection_texname),
+ &(material.reflection_texopt), token);
+ continue;
+ }
+
+ // PBR: roughness texture
+ if ((0 == strncmp(token, "map_Pr", 6)) && IS_SPACE(token[6])) {
+ token += 7;
+ ParseTextureNameAndOption(&(material.roughness_texname),
+ &(material.roughness_texopt), token);
+ continue;
+ }
+
+ // PBR: metallic texture
+ if ((0 == strncmp(token, "map_Pm", 6)) && IS_SPACE(token[6])) {
+ token += 7;
+ ParseTextureNameAndOption(&(material.metallic_texname),
+ &(material.metallic_texopt), token);
+ continue;
+ }
+
+ // PBR: sheen texture
+ if ((0 == strncmp(token, "map_Ps", 6)) && IS_SPACE(token[6])) {
+ token += 7;
+ ParseTextureNameAndOption(&(material.sheen_texname),
+ &(material.sheen_texopt), token);
+ continue;
+ }
+
+ // PBR: emissive texture
+ if ((0 == strncmp(token, "map_Ke", 6)) && IS_SPACE(token[6])) {
+ token += 7;
+ ParseTextureNameAndOption(&(material.emissive_texname),
+ &(material.emissive_texopt), token);
+ continue;
+ }
+
+ // PBR: normal map texture
+ if ((0 == strncmp(token, "norm", 4)) && IS_SPACE(token[4])) {
+ token += 5;
+ ParseTextureNameAndOption(&(material.normal_texname),
+ &(material.normal_texopt), token);
+ continue;
+ }
+
+ // unknown parameter
+ const char *_space = strchr(token, ' ');
+ if (!_space) {
+ _space = strchr(token, '\t');
+ }
+ if (_space) {
+ std::ptrdiff_t len = _space - token;
+ std::string key(token, static_cast<size_t>(len));
+ std::string value = _space + 1;
+ material.unknown_parameter.insert(
+ std::pair<std::string, std::string>(key, value));
+ }
+ }
+ // flush last material.
+ material_map->insert(std::pair<std::string, int>(
+ material.name, static_cast<int>(materials->size())));
+ materials->push_back(material);
+
+ if (warning) {
+ (*warning) = warn_ss.str();
+ }
+}
+
+bool MaterialFileReader::operator()(const std::string &matId,
+ std::vector<material_t> *materials,
+ std::map<std::string, int> *matMap,
+ std::string *warn, std::string *err) {
+ if (!m_mtlBaseDir.empty()) {
+#ifdef _WIN32
+ char sep = ';';
+#else
+ char sep = ':';
+#endif
+
+ // https://stackoverflow.com/questions/5167625/splitting-a-c-stdstring-using-tokens-e-g
+ std::vector<std::string> paths;
+ std::istringstream f(m_mtlBaseDir);
+
+ std::string s;
+ while (getline(f, s, sep)) {
+ paths.push_back(s);
+ }
+
+ for (size_t i = 0; i < paths.size(); i++) {
+ std::string filepath = JoinPath(paths[i], matId);
+
+ std::ifstream matIStream(filepath.c_str());
+ if (matIStream) {
+ LoadMtl(matMap, materials, &matIStream, warn, err);
+
+ return true;
+ }
+ }
+
+ std::stringstream ss;
+ ss << "Material file [ " << matId
+ << " ] not found in a path : " << m_mtlBaseDir << "\n";
+ if (warn) {
+ (*warn) += ss.str();
+ }
+ return false;
+
+ } else {
+ std::string filepath = matId;
+ std::ifstream matIStream(filepath.c_str());
+ if (matIStream) {
+ LoadMtl(matMap, materials, &matIStream, warn, err);
+
+ return true;
+ }
+
+ std::stringstream ss;
+ ss << "Material file [ " << filepath
+ << " ] not found in a path : " << m_mtlBaseDir << "\n";
+ if (warn) {
+ (*warn) += ss.str();
+ }
+
+ return false;
+ }
+}
+
+bool MaterialStreamReader::operator()(const std::string &matId,
+ std::vector<material_t> *materials,
+ std::map<std::string, int> *matMap,
+ std::string *warn, std::string *err) {
+ (void)err;
+ (void)matId;
+ if (!m_inStream) {
+ std::stringstream ss;
+ ss << "Material stream in error state. \n";
+ if (warn) {
+ (*warn) += ss.str();
+ }
+ return false;
+ }
+
+ LoadMtl(matMap, materials, &m_inStream, warn, err);
+
+ return true;
+}
+
+bool LoadObj(attrib_t *attrib, std::vector<shape_t> *shapes,
+ std::vector<material_t> *materials, std::string *warn,
+ std::string *err, const char *filename, const char *mtl_basedir,
+ bool triangulate, bool default_vcols_fallback) {
+ attrib->vertices.clear();
+ attrib->normals.clear();
+ attrib->texcoords.clear();
+ attrib->colors.clear();
+ shapes->clear();
+
+ std::stringstream errss;
+
+ std::ifstream ifs(filename);
+ if (!ifs) {
+ errss << "Cannot open file [" << filename << "]\n";
+ if (err) {
+ (*err) = errss.str();
+ }
+ return false;
+ }
+
+ std::string baseDir = mtl_basedir ? mtl_basedir : "";
+ if (!baseDir.empty()) {
+#ifndef _WIN32
+ const char dirsep = '/';
+#else
+ const char dirsep = '\\';
+#endif
+ if (baseDir[baseDir.length() - 1] != dirsep) baseDir += dirsep;
+ }
+ MaterialFileReader matFileReader(baseDir);
+
+ return LoadObj(attrib, shapes, materials, warn, err, &ifs, &matFileReader,
+ triangulate, default_vcols_fallback);
+}
+
+bool LoadObj(attrib_t *attrib, std::vector<shape_t> *shapes,
+ std::vector<material_t> *materials, std::string *warn,
+ std::string *err, std::istream *inStream,
+ MaterialReader *readMatFn /*= NULL*/, bool triangulate,
+ bool default_vcols_fallback) {
+ std::stringstream errss;
+
+ std::vector<real_t> v;
+ std::vector<real_t> vertex_weights; // optional [w] component in `v`
+ std::vector<real_t> vn;
+ std::vector<real_t> vt;
+ std::vector<real_t> vc;
+ std::vector<skin_weight_t> vw; // tinyobj extension: vertex skin weights
+ std::vector<tag_t> tags;
+ PrimGroup prim_group;
+ std::string name;
+
+ // material
+ std::set<std::string> material_filenames;
+ std::map<std::string, int> material_map;
+ int material = -1;
+
+ // smoothing group id
+ unsigned int current_smoothing_id =
+ 0; // Initial value. 0 means no smoothing.
+
+ int greatest_v_idx = -1;
+ int greatest_vn_idx = -1;
+ int greatest_vt_idx = -1;
+
+ shape_t shape;
+
+ bool found_all_colors = true; // check if all 'v' line has color info
+
+ size_t line_num = 0;
+ std::string linebuf;
+ while (inStream->peek() != -1) {
+ safeGetline(*inStream, linebuf);
+
+ line_num++;
+
+ // Trim newline '\r\n' or '\n'
+ if (linebuf.size() > 0) {
+ if (linebuf[linebuf.size() - 1] == '\n')
+ linebuf.erase(linebuf.size() - 1);
+ }
+ if (linebuf.size() > 0) {
+ if (linebuf[linebuf.size() - 1] == '\r')
+ linebuf.erase(linebuf.size() - 1);
+ }
+
+ // Skip if empty line.
+ if (linebuf.empty()) {
+ continue;
+ }
+
+ // Skip leading space.
+ const char *token = linebuf.c_str();
+ token += strspn(token, " \t");
+
+ assert(token);
+ if (token[0] == '\0') continue; // empty line
+
+ if (token[0] == '#') continue; // comment line
+
+ // vertex
+ if (token[0] == 'v' && IS_SPACE((token[1]))) {
+ token += 2;
+ real_t x, y, z;
+ real_t r, g, b;
+
+ int num_components = parseVertexWithColor(&x, &y, &z, &r, &g, &b, &token);
+ found_all_colors &= (num_components == 6);
+
+ v.push_back(x);
+ v.push_back(y);
+ v.push_back(z);
+
+ vertex_weights.push_back(
+ r); // r = w, and initialized to 1.0 when `w` component is not found.
+
+ if ((num_components == 6) || default_vcols_fallback) {
+ vc.push_back(r);
+ vc.push_back(g);
+ vc.push_back(b);
+ }
+
+ continue;
+ }
+
+ // normal
+ if (token[0] == 'v' && token[1] == 'n' && IS_SPACE((token[2]))) {
+ token += 3;
+ real_t x, y, z;
+ parseReal3(&x, &y, &z, &token);
+ vn.push_back(x);
+ vn.push_back(y);
+ vn.push_back(z);
+ continue;
+ }
+
+ // texcoord
+ if (token[0] == 'v' && token[1] == 't' && IS_SPACE((token[2]))) {
+ token += 3;
+ real_t x, y;
+ parseReal2(&x, &y, &token);
+ vt.push_back(x);
+ vt.push_back(y);
+ continue;
+ }
+
+ // skin weight. tinyobj extension
+ if (token[0] == 'v' && token[1] == 'w' && IS_SPACE((token[2]))) {
+ token += 3;
+
+ // vw <vid> <joint_0> <weight_0> <joint_1> <weight_1> ...
+ // example:
+ // vw 0 0 0.25 1 0.25 2 0.5
+
+ // TODO(syoyo): Add syntax check
+ int vid = 0;
+ vid = parseInt(&token);
+
+ skin_weight_t sw;
+
+ sw.vertex_id = vid;
+
+ while (!IS_NEW_LINE(token[0]) && token[0] != '#') {
+ real_t j, w;
+ // joint_id should not be negative, weight may be negative
+ // TODO(syoyo): # of elements check
+ parseReal2(&j, &w, &token, -1.0);
+
+ if (j < static_cast<real_t>(0)) {
+ if (err) {
+ std::stringstream ss;
+ ss << "Failed parse `vw' line. joint_id is negative. "
+ "line "
+ << line_num << ".)\n";
+ (*err) += ss.str();
+ }
+ return false;
+ }
+
+ joint_and_weight_t jw;
+
+ jw.joint_id = int(j);
+ jw.weight = w;
+
+ sw.weightValues.push_back(jw);
+
+ size_t n = strspn(token, " \t\r");
+ token += n;
+ }
+
+ vw.push_back(sw);
+ }
+
+ warning_context context;
+ context.warn = warn;
+ context.line_number = line_num;
+
+ // line
+ if (token[0] == 'l' && IS_SPACE((token[1]))) {
+ token += 2;
+
+ __line_t line;
+
+ while (!IS_NEW_LINE(token[0]) && token[0] != '#') {
+ vertex_index_t vi;
+ if (!parseTriple(&token, static_cast<int>(v.size() / 3),
+ static_cast<int>(vn.size() / 3),
+ static_cast<int>(vt.size() / 2), &vi, context)) {
+ if (err) {
+ (*err) +=
+ "Failed to parse `l' line (e.g. a zero value for vertex index. "
+ "Line " +
+ toString(line_num) + ").\n";
+ }
+ return false;
+ }
+
+ line.vertex_indices.push_back(vi);
+
+ size_t n = strspn(token, " \t\r");
+ token += n;
+ }
+
+ prim_group.lineGroup.push_back(line);
+
+ continue;
+ }
+
+ // points
+ if (token[0] == 'p' && IS_SPACE((token[1]))) {
+ token += 2;
+
+ __points_t pts;
+
+ while (!IS_NEW_LINE(token[0]) && token[0] != '#') {
+ vertex_index_t vi;
+ if (!parseTriple(&token, static_cast<int>(v.size() / 3),
+ static_cast<int>(vn.size() / 3),
+ static_cast<int>(vt.size() / 2), &vi, context)) {
+ if (err) {
+ (*err) +=
+ "Failed to parse `p' line (e.g. a zero value for vertex index. "
+ "Line " +
+ toString(line_num) + ").\n";
+ }
+ return false;
+ }
+
+ pts.vertex_indices.push_back(vi);
+
+ size_t n = strspn(token, " \t\r");
+ token += n;
+ }
+
+ prim_group.pointsGroup.push_back(pts);
+
+ continue;
+ }
+
+ // face
+ if (token[0] == 'f' && IS_SPACE((token[1]))) {
+ token += 2;
+ token += strspn(token, " \t");
+
+ face_t face;
+
+ face.smoothing_group_id = current_smoothing_id;
+ face.vertex_indices.reserve(3);
+
+ while (!IS_NEW_LINE(token[0]) && token[0] != '#') {
+ vertex_index_t vi;
+ if (!parseTriple(&token, static_cast<int>(v.size() / 3),
+ static_cast<int>(vn.size() / 3),
+ static_cast<int>(vt.size() / 2), &vi, context)) {
+ if (err) {
+ (*err) +=
+ "Failed to parse `f' line (e.g. a zero value for vertex index "
+ "or invalid relative vertex index). Line " +
+ toString(line_num) + ").\n";
+ }
+ return false;
+ }
+
+ greatest_v_idx = greatest_v_idx > vi.v_idx ? greatest_v_idx : vi.v_idx;
+ greatest_vn_idx =
+ greatest_vn_idx > vi.vn_idx ? greatest_vn_idx : vi.vn_idx;
+ greatest_vt_idx =
+ greatest_vt_idx > vi.vt_idx ? greatest_vt_idx : vi.vt_idx;
+
+ face.vertex_indices.push_back(vi);
+ size_t n = strspn(token, " \t\r");
+ token += n;
+ }
+
+ // replace with emplace_back + std::move on C++11
+ prim_group.faceGroup.push_back(face);
+
+ continue;
+ }
+
+ // use mtl
+ if ((0 == strncmp(token, "usemtl", 6))) {
+ token += 6;
+ std::string namebuf = parseString(&token);
+
+ int newMaterialId = -1;
+ std::map<std::string, int>::const_iterator it =
+ material_map.find(namebuf);
+ if (it != material_map.end()) {
+ newMaterialId = it->second;
+ } else {
+ // { error!! material not found }
+ if (warn) {
+ (*warn) += "material [ '" + namebuf + "' ] not found in .mtl\n";
+ }
+ }
+
+ if (newMaterialId != material) {
+ // Create per-face material. Thus we don't add `shape` to `shapes` at
+ // this time.
+ // just clear `faceGroup` after `exportGroupsToShape()` call.
+ exportGroupsToShape(&shape, prim_group, tags, material, name,
+ triangulate, v, warn);
+ prim_group.faceGroup.clear();
+ material = newMaterialId;
+ }
+
+ continue;
+ }
+
+ // load mtl
+ if ((0 == strncmp(token, "mtllib", 6)) && IS_SPACE((token[6]))) {
+ if (readMatFn) {
+ token += 7;
+
+ std::vector<std::string> filenames;
+ SplitString(std::string(token), ' ', '\\', filenames);
+
+ if (filenames.empty()) {
+ if (warn) {
+ std::stringstream ss;
+ ss << "Looks like empty filename for mtllib. Use default "
+ "material (line "
+ << line_num << ".)\n";
+
+ (*warn) += ss.str();
+ }
+ } else {
+ bool found = false;
+ for (size_t s = 0; s < filenames.size(); s++) {
+ if (material_filenames.count(filenames[s]) > 0) {
+ found = true;
+ continue;
+ }
+
+ std::string warn_mtl;
+ std::string err_mtl;
+ bool ok = (*readMatFn)(filenames[s].c_str(), materials,
+ &material_map, &warn_mtl, &err_mtl);
+ if (warn && (!warn_mtl.empty())) {
+ (*warn) += warn_mtl;
+ }
+
+ if (err && (!err_mtl.empty())) {
+ (*err) += err_mtl;
+ }
+
+ if (ok) {
+ found = true;
+ material_filenames.insert(filenames[s]);
+ break;
+ }
+ }
+
+ if (!found) {
+ if (warn) {
+ (*warn) +=
+ "Failed to load material file(s). Use default "
+ "material.\n";
+ }
+ }
+ }
+ }
+
+ continue;
+ }
+
+ // group name
+ if (token[0] == 'g' && IS_SPACE((token[1]))) {
+ // flush previous face group.
+ bool ret = exportGroupsToShape(&shape, prim_group, tags, material, name,
+ triangulate, v, warn);
+ (void)ret; // return value not used.
+
+ if (shape.mesh.indices.size() > 0) {
+ shapes->push_back(shape);
+ }
+
+ shape = shape_t();
+
+ // material = -1;
+ prim_group.clear();
+
+ std::vector<std::string> names;
+
+ while (!IS_NEW_LINE(token[0]) && token[0] != '#') {
+ std::string str = parseString(&token);
+ names.push_back(str);
+ token += strspn(token, " \t\r"); // skip tag
+ }
+
+ // names[0] must be 'g'
+
+ if (names.size() < 2) {
+ // 'g' with empty names
+ if (warn) {
+ std::stringstream ss;
+ ss << "Empty group name. line: " << line_num << "\n";
+ (*warn) += ss.str();
+ name = "";
+ }
+ } else {
+ std::stringstream ss;
+ ss << names[1];
+
+ // tinyobjloader does not support multiple groups for a primitive.
+ // Currently we concatinate multiple group names with a space to get
+ // single group name.
+
+ for (size_t i = 2; i < names.size(); i++) {
+ ss << " " << names[i];
+ }
+
+ name = ss.str();
+ }
+
+ continue;
+ }
+
+ // object name
+ if (token[0] == 'o' && IS_SPACE((token[1]))) {
+ // flush previous face group.
+ bool ret = exportGroupsToShape(&shape, prim_group, tags, material, name,
+ triangulate, v, warn);
+ (void)ret; // return value not used.
+
+ if (shape.mesh.indices.size() > 0 || shape.lines.indices.size() > 0 ||
+ shape.points.indices.size() > 0) {
+ shapes->push_back(shape);
+ }
+
+ // material = -1;
+ prim_group.clear();
+ shape = shape_t();
+
+ // @todo { multiple object name? }
+ token += 2;
+ std::stringstream ss;
+ ss << token;
+ name = ss.str();
+
+ continue;
+ }
+
+ if (token[0] == 't' && IS_SPACE(token[1])) {
+ const int max_tag_nums = 8192; // FIXME(syoyo): Parameterize.
+ tag_t tag;
+
+ token += 2;
+
+ tag.name = parseString(&token);
+
+ tag_sizes ts = parseTagTriple(&token);
+
+ if (ts.num_ints < 0) {
+ ts.num_ints = 0;
+ }
+ if (ts.num_ints > max_tag_nums) {
+ ts.num_ints = max_tag_nums;
+ }
+
+ if (ts.num_reals < 0) {
+ ts.num_reals = 0;
+ }
+ if (ts.num_reals > max_tag_nums) {
+ ts.num_reals = max_tag_nums;
+ }
+
+ if (ts.num_strings < 0) {
+ ts.num_strings = 0;
+ }
+ if (ts.num_strings > max_tag_nums) {
+ ts.num_strings = max_tag_nums;
+ }
+
+ tag.intValues.resize(static_cast<size_t>(ts.num_ints));
+
+ for (size_t i = 0; i < static_cast<size_t>(ts.num_ints); ++i) {
+ tag.intValues[i] = parseInt(&token);
+ }
+
+ tag.floatValues.resize(static_cast<size_t>(ts.num_reals));
+ for (size_t i = 0; i < static_cast<size_t>(ts.num_reals); ++i) {
+ tag.floatValues[i] = parseReal(&token);
+ }
+
+ tag.stringValues.resize(static_cast<size_t>(ts.num_strings));
+ for (size_t i = 0; i < static_cast<size_t>(ts.num_strings); ++i) {
+ tag.stringValues[i] = parseString(&token);
+ }
+
+ tags.push_back(tag);
+
+ continue;
+ }
+
+ if (token[0] == 's' && IS_SPACE(token[1])) {
+ // smoothing group id
+ token += 2;
+
+ // skip space.
+ token += strspn(token, " \t"); // skip space
+
+ if (token[0] == '\0') {
+ continue;
+ }
+
+ if (token[0] == '\r' || token[1] == '\n') {
+ continue;
+ }
+
+ if (strlen(token) >= 3 && token[0] == 'o' && token[1] == 'f' &&
+ token[2] == 'f') {
+ current_smoothing_id = 0;
+ } else {
+ // assume number
+ int smGroupId = parseInt(&token);
+ if (smGroupId < 0) {
+ // parse error. force set to 0.
+ // FIXME(syoyo): Report warning.
+ current_smoothing_id = 0;
+ } else {
+ current_smoothing_id = static_cast<unsigned int>(smGroupId);
+ }
+ }
+
+ continue;
+ } // smoothing group id
+
+ // Ignore unknown command.
+ }
+
+ // not all vertices have colors, no default colors desired? -> clear colors
+ if (!found_all_colors && !default_vcols_fallback) {
+ vc.clear();
+ }
+
+ if (greatest_v_idx >= static_cast<int>(v.size() / 3)) {
+ if (warn) {
+ std::stringstream ss;
+ ss << "Vertex indices out of bounds (line " << line_num << ".)\n\n";
+ (*warn) += ss.str();
+ }
+ }
+ if (greatest_vn_idx >= static_cast<int>(vn.size() / 3)) {
+ if (warn) {
+ std::stringstream ss;
+ ss << "Vertex normal indices out of bounds (line " << line_num
+ << ".)\n\n";
+ (*warn) += ss.str();
+ }
+ }
+ if (greatest_vt_idx >= static_cast<int>(vt.size() / 2)) {
+ if (warn) {
+ std::stringstream ss;
+ ss << "Vertex texcoord indices out of bounds (line " << line_num
+ << ".)\n\n";
+ (*warn) += ss.str();
+ }
+ }
+
+ bool ret = exportGroupsToShape(&shape, prim_group, tags, material, name,
+ triangulate, v, warn);
+ // exportGroupsToShape return false when `usemtl` is called in the last
+ // line.
+ // we also add `shape` to `shapes` when `shape.mesh` has already some
+ // faces(indices)
+ if (ret || shape.mesh.indices
+ .size()) { // FIXME(syoyo): Support other prims(e.g. lines)
+ shapes->push_back(shape);
+ }
+ prim_group.clear(); // for safety
+
+ if (err) {
+ (*err) += errss.str();
+ }
+
+ attrib->vertices.swap(v);
+ attrib->vertex_weights.swap(vertex_weights);
+ attrib->normals.swap(vn);
+ attrib->texcoords.swap(vt);
+ attrib->texcoord_ws.swap(vt);
+ attrib->colors.swap(vc);
+ attrib->skin_weights.swap(vw);
+
+ return true;
+}
+
+bool LoadObjWithCallback(std::istream &inStream, const callback_t &callback,
+ void *user_data /*= NULL*/,
+ MaterialReader *readMatFn /*= NULL*/,
+ std::string *warn, /* = NULL*/
+ std::string *err /*= NULL*/) {
+ std::stringstream errss;
+
+ // material
+ std::set<std::string> material_filenames;
+ std::map<std::string, int> material_map;
+ int material_id = -1; // -1 = invalid
+
+ std::vector<index_t> indices;
+ std::vector<material_t> materials;
+ std::vector<std::string> names;
+ names.reserve(2);
+ std::vector<const char *> names_out;
+
+ std::string linebuf;
+ while (inStream.peek() != -1) {
+ safeGetline(inStream, linebuf);
+
+ // Trim newline '\r\n' or '\n'
+ if (linebuf.size() > 0) {
+ if (linebuf[linebuf.size() - 1] == '\n')
+ linebuf.erase(linebuf.size() - 1);
+ }
+ if (linebuf.size() > 0) {
+ if (linebuf[linebuf.size() - 1] == '\r')
+ linebuf.erase(linebuf.size() - 1);
+ }
+
+ // Skip if empty line.
+ if (linebuf.empty()) {
+ continue;
+ }
+
+ // Skip leading space.
+ const char *token = linebuf.c_str();
+ token += strspn(token, " \t");
+
+ assert(token);
+ if (token[0] == '\0') continue; // empty line
+
+ if (token[0] == '#') continue; // comment line
+
+ // vertex
+ if (token[0] == 'v' && IS_SPACE((token[1]))) {
+ token += 2;
+ real_t x, y, z;
+ real_t r, g, b;
+
+ int num_components = parseVertexWithColor(&x, &y, &z, &r, &g, &b, &token);
+ if (callback.vertex_cb) {
+ callback.vertex_cb(user_data, x, y, z, r); // r=w is optional
+ }
+ if (callback.vertex_color_cb) {
+ bool found_color = (num_components == 6);
+ callback.vertex_color_cb(user_data, x, y, z, r, g, b, found_color);
+ }
+ continue;
+ }
+
+ // normal
+ if (token[0] == 'v' && token[1] == 'n' && IS_SPACE((token[2]))) {
+ token += 3;
+ real_t x, y, z;
+ parseReal3(&x, &y, &z, &token);
+ if (callback.normal_cb) {
+ callback.normal_cb(user_data, x, y, z);
+ }
+ continue;
+ }
+
+ // texcoord
+ if (token[0] == 'v' && token[1] == 't' && IS_SPACE((token[2]))) {
+ token += 3;
+ real_t x, y, z; // y and z are optional. default = 0.0
+ parseReal3(&x, &y, &z, &token);
+ if (callback.texcoord_cb) {
+ callback.texcoord_cb(user_data, x, y, z);
+ }
+ continue;
+ }
+
+ // face
+ if (token[0] == 'f' && IS_SPACE((token[1]))) {
+ token += 2;
+ token += strspn(token, " \t");
+
+ indices.clear();
+ while (!IS_NEW_LINE(token[0]) && token[0] != '#') {
+ vertex_index_t vi = parseRawTriple(&token);
+
+ index_t idx;
+ idx.vertex_index = vi.v_idx;
+ idx.normal_index = vi.vn_idx;
+ idx.texcoord_index = vi.vt_idx;
+
+ indices.push_back(idx);
+ size_t n = strspn(token, " \t\r");
+ token += n;
+ }
+
+ if (callback.index_cb && indices.size() > 0) {
+ callback.index_cb(user_data, &indices.at(0),
+ static_cast<int>(indices.size()));
+ }
+
+ continue;
+ }
+
+ // use mtl
+ if ((0 == strncmp(token, "usemtl", 6)) && IS_SPACE((token[6]))) {
+ token += 7;
+ std::stringstream ss;
+ ss << token;
+ std::string namebuf = ss.str();
+
+ int newMaterialId = -1;
+ std::map<std::string, int>::const_iterator it =
+ material_map.find(namebuf);
+ if (it != material_map.end()) {
+ newMaterialId = it->second;
+ } else {
+ // { warn!! material not found }
+ if (warn && (!callback.usemtl_cb)) {
+ (*warn) += "material [ " + namebuf + " ] not found in .mtl\n";
+ }
+ }
+
+ if (newMaterialId != material_id) {
+ material_id = newMaterialId;
+ }
+
+ if (callback.usemtl_cb) {
+ callback.usemtl_cb(user_data, namebuf.c_str(), material_id);
+ }
+
+ continue;
+ }
+
+ // load mtl
+ if ((0 == strncmp(token, "mtllib", 6)) && IS_SPACE((token[6]))) {
+ if (readMatFn) {
+ token += 7;
+
+ std::vector<std::string> filenames;
+ SplitString(std::string(token), ' ', '\\', filenames);
+
+ if (filenames.empty()) {
+ if (warn) {
+ (*warn) +=
+ "Looks like empty filename for mtllib. Use default "
+ "material. \n";
+ }
+ } else {
+ bool found = false;
+ for (size_t s = 0; s < filenames.size(); s++) {
+ if (material_filenames.count(filenames[s]) > 0) {
+ found = true;
+ continue;
+ }
+
+ std::string warn_mtl;
+ std::string err_mtl;
+ bool ok = (*readMatFn)(filenames[s].c_str(), &materials,
+ &material_map, &warn_mtl, &err_mtl);
+
+ if (warn && (!warn_mtl.empty())) {
+ (*warn) += warn_mtl; // This should be warn message.
+ }
+
+ if (err && (!err_mtl.empty())) {
+ (*err) += err_mtl;
+ }
+
+ if (ok) {
+ found = true;
+ material_filenames.insert(filenames[s]);
+ break;
+ }
+ }
+
+ if (!found) {
+ if (warn) {
+ (*warn) +=
+ "Failed to load material file(s). Use default "
+ "material.\n";
+ }
+ } else {
+ if (callback.mtllib_cb) {
+ callback.mtllib_cb(user_data, &materials.at(0),
+ static_cast<int>(materials.size()));
+ }
+ }
+ }
+ }
+
+ continue;
+ }
+
+ // group name
+ if (token[0] == 'g' && IS_SPACE((token[1]))) {
+ names.clear();
+
+ while (!IS_NEW_LINE(token[0]) && token[0] != '#') {
+ std::string str = parseString(&token);
+ names.push_back(str);
+ token += strspn(token, " \t\r"); // skip tag
+ }
+
+ assert(names.size() > 0);
+
+ if (callback.group_cb) {
+ if (names.size() > 1) {
+ // create const char* array.
+ names_out.resize(names.size() - 1);
+ for (size_t j = 0; j < names_out.size(); j++) {
+ names_out[j] = names[j + 1].c_str();
+ }
+ callback.group_cb(user_data, &names_out.at(0),
+ static_cast<int>(names_out.size()));
+
+ } else {
+ callback.group_cb(user_data, NULL, 0);
+ }
+ }
+
+ continue;
+ }
+
+ // object name
+ if (token[0] == 'o' && IS_SPACE((token[1]))) {
+ // @todo { multiple object name? }
+ token += 2;
+
+ std::stringstream ss;
+ ss << token;
+ std::string object_name = ss.str();
+
+ if (callback.object_cb) {
+ callback.object_cb(user_data, object_name.c_str());
+ }
+
+ continue;
+ }
+
+#if 0 // @todo
+ if (token[0] == 't' && IS_SPACE(token[1])) {
+ tag_t tag;
+
+ token += 2;
+ std::stringstream ss;
+ ss << token;
+ tag.name = ss.str();
+
+ token += tag.name.size() + 1;
+
+ tag_sizes ts = parseTagTriple(&token);
+
+ tag.intValues.resize(static_cast<size_t>(ts.num_ints));
+
+ for (size_t i = 0; i < static_cast<size_t>(ts.num_ints); ++i) {
+ tag.intValues[i] = atoi(token);
+ token += strcspn(token, "/ \t\r") + 1;
+ }
+
+ tag.floatValues.resize(static_cast<size_t>(ts.num_reals));
+ for (size_t i = 0; i < static_cast<size_t>(ts.num_reals); ++i) {
+ tag.floatValues[i] = parseReal(&token);
+ token += strcspn(token, "/ \t\r") + 1;
+ }
+
+ tag.stringValues.resize(static_cast<size_t>(ts.num_strings));
+ for (size_t i = 0; i < static_cast<size_t>(ts.num_strings); ++i) {
+ std::stringstream ss;
+ ss << token;
+ tag.stringValues[i] = ss.str();
+ token += tag.stringValues[i].size() + 1;
+ }
+
+ tags.push_back(tag);
+ }
+#endif
+
+ // Ignore unknown command.
+ }
+
+ if (err) {
+ (*err) += errss.str();
+ }
+
+ return true;
+}
+
+bool ObjReader::ParseFromFile(const std::string &filename,
+ const ObjReaderConfig &config) {
+ std::string mtl_search_path;
+
+ if (config.mtl_search_path.empty()) {
+ //
+ // split at last '/'(for unixish system) or '\\'(for windows) to get
+ // the base directory of .obj file
+ //
+ size_t pos = filename.find_last_of("/\\");
+ if (pos != std::string::npos) {
+ mtl_search_path = filename.substr(0, pos);
+ }
+ } else {
+ mtl_search_path = config.mtl_search_path;
+ }
+
+ valid_ = LoadObj(&attrib_, &shapes_, &materials_, &warning_, &error_,
+ filename.c_str(), mtl_search_path.c_str(),
+ config.triangulate, config.vertex_color);
+
+ return valid_;
+}
+
+bool ObjReader::ParseFromString(const std::string &obj_text,
+ const std::string &mtl_text,
+ const ObjReaderConfig &config) {
+ std::stringbuf obj_buf(obj_text);
+ std::stringbuf mtl_buf(mtl_text);
+
+ std::istream obj_ifs(&obj_buf);
+ std::istream mtl_ifs(&mtl_buf);
+
+ MaterialStreamReader mtl_ss(mtl_ifs);
+
+ valid_ = LoadObj(&attrib_, &shapes_, &materials_, &warning_, &error_,
+ &obj_ifs, &mtl_ss, config.triangulate, config.vertex_color);
+
+ return valid_;
+}
+
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif
+} // namespace tinyobj
+
+#endif