Broken Models lol

physicaly-based-renderer/.vscode/settings.json

@@ -0,0 +1,9 @@
+{
+    "files.associations": {
+        "*.pyx": "python",
+        "*.js": "javascript",
+        "*.c": "c",
+        "*.scene": "yaml",
+        "ostream": "cpp"
+    }
+}

physicaly-based-renderer/imgui.ini

@@ -4,7 +4,7 @@ Size=400,400
 Collapsed=0
 
 [Window][Scene Controls]
-Pos=121,151
+Pos=7,4
-Size=334,445
+Size=334,466
 Collapsed=0
 

physicaly-based-renderer/main.cpp

@@ -1,8 +1,8 @@
 // main.cpp
 // A minimal physically based renderer with ImGui integration,
-// normal mapping (with per-vertex tangents),
+// normal mapping (with per-vertex tangents), YAML-based material loading/saving,
-// YAML-based material loading and material saving via yaml-cpp.
+// and support for loading 3D models (OBJ files) via tinyobjloader.
-// Uses OpenGL, GLFW, GLEW, GLM, ImGui (and IM_PI), stb_image, and yaml-cpp.
+// Uses OpenGL, GLFW, GLEW, GLM, ImGui (and IM_PI), stb_image, yaml-cpp, and tinyobjloader.
 // Compile (e.g. on Linux) with:
 //    g++ main.cpp -lglfw -lGLEW -lGL -ldl -limgui -lyaml-cpp -o pbr_renderer
 // (Adjust include paths and linker flags as needed.)
@@ -20,10 +20,11 @@
 #include <cmath>
 #include <cstring>
 #include <string>
+#include <map>
 
 // ImGui includes.
 #include "imgui.h"
-#include "imgui_internal.h"   // for IM_PI (ImGui's internal constant)
+#include "imgui_internal.h" // For IM_PI (ImGui's internal constant)
 #include "imgui_impl_glfw.h"
 #include "imgui_impl_opengl3.h"
 
@@ -31,9 +32,13 @@
 #define STB_IMAGE_IMPLEMENTATION
 #include "stb_image.h"
 
-// yaml-cpp for YAML material loading and saving.
+// yaml-cpp for YAML material loading/saving.
 #include <yaml-cpp/yaml.h>
 
+// tinyobjloader for OBJ file loading.
+#define TINYOBJLOADER_IMPLEMENTATION
+#include "tiny_obj_loader.h"
+
 // --------------------------------------------------------------------------------------
 // Shader sources
 // --------------------------------------------------------------------------------------
@@ -59,7 +64,7 @@ uniform mat4 projection;
 void main(){
     WorldPos = vec3(model * vec4(aPos, 1.0));
     Normal = mat3(transpose(inverse(model))) * aNormal;
-    // For tangent, we simply transform with the model matrix (ignoring potential scale issues).
+    // For tangent, we simply transform with the model matrix.
     Tangent = mat3(model) * aTangent;
     TexCoords = aTexCoords;
     gl_Position = projection * view * vec4(WorldPos, 1.0);
@@ -67,8 +72,7 @@ void main(){
 )";
 
 // --- Fragment Shader ---
-// Uses a uniform for PI (set from ImGui's internal IM_PI) and supports texture maps.
+// Supports texture maps, normal mapping (via TBN), and uses ImGui's IM_PI constant.
-// It now also supports a normal map: if enabled, it uses TBN to compute a perturbed normal.
 const char* fragmentShaderSource = R"(
 #version 330 core
 out vec4 FragColor;
@@ -135,13 +139,10 @@ float GeometrySmith(vec3 N, vec3 V, vec3 L, float roughness) {
 }
 
 void main(){
-    // Start with the geometry normal.
     vec3 N = normalize(Normal);
-    
-    // If a normal map is used, sample the normal map and compute a perturbed normal.
     if (useNormalMap) {
         vec3 tangentNormal = texture(normalMap, TexCoords).rgb;
-        tangentNormal = tangentNormal * 2.0 - 1.0; // Remap from [0,1] to [-1,1]
+        tangentNormal = tangentNormal * 2.0 - 1.0;
         vec3 T = normalize(Tangent);
         vec3 B = normalize(cross(N, T));
         mat3 TBN = mat3(T, B, N);
@@ -150,7 +151,6 @@ void main(){
     
     vec3 V = normalize(camPos - WorldPos);
     
-    // Get material parameter values from textures (if enabled) or use fallback values.
     vec3 albedoValue = albedo;
     if (useAlbedoMap)
         albedoValue = texture(albedoMap, TexCoords).rgb;
@@ -167,7 +167,6 @@ void main(){
     if (useAOMap)
         aoValue = texture(aoMap, TexCoords).r;
     
-    // Calculate reflectance at normal incidence.
     vec3 F0 = vec3(0.04);
     F0 = mix(F0, albedoValue, metallicValue);
     
@@ -194,7 +193,6 @@ void main(){
     vec3 ambient = vec3(0.03) * albedoValue * aoValue;
     color += ambient;
     
-    // Simple HDR tonemapping & gamma correction.
     color = color / (color + vec3(1.0));
     color = pow(color, vec3(1.0/2.2));
     
@@ -209,7 +207,6 @@ GLuint compileShader(GLenum shaderType, const char* source) {
     GLuint shader = glCreateShader(shaderType);
     glShaderSource(shader, 1, &source, nullptr);
     glCompileShader(shader);
-    
     GLint success;
     glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
     if (!success){
@@ -225,7 +222,6 @@ GLuint createProgram(GLuint vertexShader, GLuint fragmentShader) {
     glAttachShader(program, vertexShader);
     glAttachShader(program, fragmentShader);
     glLinkProgram(program);
-    
     GLint success;
     glGetProgramiv(program, GL_LINK_STATUS, &success);
     if (!success){
@@ -254,7 +250,6 @@ GLuint LoadTexture(const char* path) {
         format = GL_RGB;
     else if(nrChannels == 4)
         format = GL_RGBA;
-        
     GLuint textureID;
     glGenTextures(1, &textureID);
     glBindTexture(GL_TEXTURE_2D, textureID);
@@ -265,68 +260,12 @@ GLuint LoadTexture(const char* path) {
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-    
     stbi_image_free(data);
     return textureID;
 }
 
 // --------------------------------------------------------------------------------------
-// Sphere mesh generation with tangents.
+// Data Structures for Meshes and Models
-// Produces per-vertex data: position (3), normal (3), texcoords (2), tangent (3) → 11 floats/vertex.
-// --------------------------------------------------------------------------------------
-void generateSphere(std::vector<float>& vertices, std::vector<unsigned int>& indices,
-                    unsigned int X_SEGMENTS = 64, unsigned int Y_SEGMENTS = 64) {
-    vertices.clear();
-    indices.clear();
-    
-    for (unsigned int y = 0; y <= Y_SEGMENTS; ++y) {
-        for (unsigned int x = 0; x <= X_SEGMENTS; ++x) {
-            float xSegment = static_cast<float>(x) / X_SEGMENTS;
-            float ySegment = static_cast<float>(y) / Y_SEGMENTS;
-            // Using ImGui's IM_PI for consistency.
-            float xPos = std::cos(xSegment * 2.0f * IM_PI) * std::sin(ySegment * IM_PI);
-            float yPos = std::cos(ySegment * IM_PI);
-            float zPos = std::sin(xSegment * 2.0f * IM_PI) * std::sin(ySegment * IM_PI);
-            // Position.
-            vertices.push_back(xPos);
-            vertices.push_back(yPos);
-            vertices.push_back(zPos);
-            // Normal (unit sphere: same as position).
-            vertices.push_back(xPos);
-            vertices.push_back(yPos);
-            vertices.push_back(zPos);
-            // Texture coordinates.
-            vertices.push_back(xSegment);
-            vertices.push_back(ySegment);
-            // Tangent: derivative with respect to u.
-            float tangentX = -std::sin(xSegment * 2.0f * IM_PI);
-            float tangentY = 0.0f;
-            float tangentZ =  std::cos(xSegment * 2.0f * IM_PI);
-            vertices.push_back(tangentX);
-            vertices.push_back(tangentY);
-            vertices.push_back(tangentZ);
-        }
-    }
-    
-    for (unsigned int y = 0; y < Y_SEGMENTS; ++y) {
-        for (unsigned int x = 0; x < X_SEGMENTS; ++x) {
-            unsigned int i0 = y * (X_SEGMENTS + 1) + x;
-            unsigned int i1 = i0 + 1;
-            unsigned int i2 = i0 + (X_SEGMENTS + 1);
-            unsigned int i3 = i2 + 1;
-            indices.push_back(i0);
-            indices.push_back(i2);
-            indices.push_back(i1);
-            indices.push_back(i1);
-            indices.push_back(i2);
-            indices.push_back(i3);
-        }
-    }
-}
-
-// --------------------------------------------------------------------------------------
-// Material and Sphere Instance structures.
-// The Material now includes a normal map.
 // --------------------------------------------------------------------------------------
 struct Material {
     glm::vec3 albedo;
@@ -341,7 +280,7 @@ struct Material {
     GLuint aoTex;
     GLuint normalTex;
     
-    // Flags indicating if a texture map is used.
+    // Flags indicating texture usage.
     bool useAlbedoMap;
     bool useMetallicMap;
     bool useRoughnessMap;
@@ -370,15 +309,34 @@ struct Material {
 
 struct SphereInstance {
     glm::vec3 position;
-    float rotation; // Rotation angle (in radians).
+    float rotation; // In radians.
     Material material;
 };
 
+// For OBJ models, we define a Vertex structure.
+struct Vertex {
+    glm::vec3 position;
+    glm::vec3 normal;
+    glm::vec2 texcoord;
+    glm::vec3 tangent;
+};
+
+struct Model {
+    GLuint VAO;
+    GLuint VBO;
+    GLuint EBO;
+    unsigned int indexCount;
+    // Transformation.
+    glm::vec3 position;
+    float rotation; // Around Y axis.
+    Material material;
+    // Filename of the loaded model (for reference).
+    std::string filename;
+};
+
 // --------------------------------------------------------------------------------------
-// YAML Material Loading
+// YAML Material Loading & Saving
 // --------------------------------------------------------------------------------------
-// Expects a YAML file with keys: albedo (list of 3), metallic, roughness, ao,
-// plus optional texture paths: albedo_texture, metallic_texture, roughness_texture, ao_texture, normal_texture.
 Material loadMaterialFromYAML(const std::string& filename) {
     Material mat;
     try {
@@ -446,10 +404,6 @@ Material loadMaterialFromYAML(const std::string& filename) {
     return mat;
 }
 
-// --------------------------------------------------------------------------------------
-// YAML Material Saving
-// --------------------------------------------------------------------------------------
-// Saves a material to a YAML file with keys similar to the loader.
 bool saveMaterialToYAML(const std::string& filename, const Material& mat) {
     YAML::Emitter out;
     out << YAML::BeginMap;
@@ -479,6 +433,152 @@ bool saveMaterialToYAML(const std::string& filename, const Material& mat) {
     return true;
 }
 
+// --------------------------------------------------------------------------------------
+// OBJ Model Loading using tinyobjloader.
+// --------------------------------------------------------------------------------------
+
+// We define a Vertex structure (see above). This function loads an OBJ file
+// and outputs vertices and indices in the expected format (11 floats per vertex: 
+// position[3], normal[3], texcoord[2], tangent[3]). Tangents are computed after loading.
+bool loadOBJModel(const std::string& filename, std::vector<Vertex>& outVertices, std::vector<unsigned int>& outIndices) {
+    tinyobj::attrib_t attrib;
+    std::vector<tinyobj::shape_t> shapes;
+    std::vector<tinyobj::material_t> objMaterials;
+    std::string warn, err;
+    std::cout << "tinyobjloader Loading: " << filename << std::endl;
+    
+    bool ret = tinyobj::LoadObj(&attrib, &shapes, &objMaterials, &warn, &err, filename.c_str());
+    if (!warn.empty())
+        std::cout << "tinyobjloader warning: " << warn << std::endl;
+    if (!err.empty()) {
+        std::cerr << "tinyobjloader error: " << err << std::endl;
+        return false;
+    }
+    if (!ret) {
+        std::cerr << "Failed to load/parse OBJ file: " << filename << std::endl;
+        return false;
+    }
+    
+    // For simplicity, we push every vertex (no deduplication).
+    for (size_t s = 0; s < shapes.size(); s++) {
+        for (size_t f = 0; f < shapes[s].mesh.indices.size(); f++) {
+            tinyobj::index_t idx = shapes[s].mesh.indices[f];
+            Vertex vertex;
+            vertex.position = glm::vec3(
+                attrib.vertices[3 * idx.vertex_index + 0],
+                attrib.vertices[3 * idx.vertex_index + 1],
+                attrib.vertices[3 * idx.vertex_index + 2]
+            );
+            if (idx.normal_index >= 0) {
+                vertex.normal = glm::vec3(
+                    attrib.normals[3 * idx.normal_index + 0],
+                    attrib.normals[3 * idx.normal_index + 1],
+                    attrib.normals[3 * idx.normal_index + 2]
+                );
+            } else {
+                vertex.normal = glm::vec3(0.0f, 1.0f, 0.0f);
+            }
+            if (idx.texcoord_index >= 0) {
+                vertex.texcoord = glm::vec2(
+                    attrib.texcoords[2 * idx.texcoord_index + 0],
+                    attrib.texcoords[2 * idx.texcoord_index + 1]
+                );
+            } else {
+                vertex.texcoord = glm::vec2(0.0f, 0.0f);
+            }
+            // Initialize tangent to zero; we will compute later.
+            vertex.tangent = glm::vec3(0.0f);
+            outVertices.push_back(vertex);
+            outIndices.push_back(static_cast<unsigned int>(outVertices.size() - 1));
+        }
+    }
+    
+    // Compute tangents per triangle.
+    std::vector<glm::vec3> tanAccum(outVertices.size(), glm::vec3(0.0f));
+    for (size_t i = 0; i < outIndices.size(); i += 3) {
+        unsigned int i0 = outIndices[i + 0];
+        unsigned int i1 = outIndices[i + 1];
+        unsigned int i2 = outIndices[i + 2];
+        
+        const glm::vec3& p0 = outVertices[i0].position;
+        const glm::vec3& p1 = outVertices[i1].position;
+        const glm::vec3& p2 = outVertices[i2].position;
+        
+        const glm::vec2& uv0 = outVertices[i0].texcoord;
+        const glm::vec2& uv1 = outVertices[i1].texcoord;
+        const glm::vec2& uv2 = outVertices[i2].texcoord;
+        
+        glm::vec3 deltaPos1 = p1 - p0;
+        glm::vec3 deltaPos2 = p2 - p0;
+        glm::vec2 deltaUV1 = uv1 - uv0;
+        glm::vec2 deltaUV2 = uv2 - uv0;
+        float r = 1.0f;
+        float denom = (deltaUV1.x * deltaUV2.y - deltaUV1.y * deltaUV2.x);
+        if (fabs(denom) > 1e-6f)
+            r = 1.0f / denom;
+        glm::vec3 tangent = (deltaPos1 * deltaUV2.y - deltaPos2 * deltaUV1.y) * r;
+        
+        tanAccum[i0] += tangent;
+        tanAccum[i1] += tangent;
+        tanAccum[i2] += tangent;
+    }
+    // Normalize and store tangents.
+    for (size_t i = 0; i < outVertices.size(); i++) {
+        outVertices[i].tangent = glm::normalize(tanAccum[i]);
+    }
+    
+    return true;
+}
+
+// Create a Model from an OBJ file by loading its data and generating OpenGL buffers.
+Model loadModelFromOBJ(const std::string& filename) {
+    Model model;
+    model.filename = filename;
+    std::vector<Vertex> vertices;
+    std::vector<unsigned int> indices;
+    if (!loadOBJModel(filename, vertices, indices)) {
+        std::cerr << "Failed to load model: " << filename << std::endl;
+        model.indexCount = 0;
+        return model;
+    }
+    
+    model.indexCount = indices.size();
+    // Generate buffers.
+    glGenVertexArrays(1, &model.VAO);
+    glGenBuffers(1, &model.VBO);
+    glGenBuffers(1, &model.EBO);
+    
+    glBindVertexArray(model.VAO);
+    glBindBuffer(GL_ARRAY_BUFFER, model.VBO);
+    glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(Vertex), vertices.data(), GL_STATIC_DRAW);
+    
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, model.EBO);
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(unsigned int), indices.data(), GL_STATIC_DRAW);
+    
+    // Vertex attributes: position (location 0), normal (1), texcoord (2), tangent (3).
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, position));
+    glEnableVertexAttribArray(0);
+    
+    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, normal));
+    glEnableVertexAttribArray(1);
+    
+    glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, texcoord));
+    glEnableVertexAttribArray(2);
+    
+    glVertexAttribPointer(3, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, tangent));
+    glEnableVertexAttribArray(3);
+    
+    glBindVertexArray(0);
+    
+    // Set default transformation.
+    model.position = glm::vec3(0.0f);
+    model.rotation = 0.0f;
+    // Default material.
+    model.material = Material();
+    
+    return model;
+}
+
 // --------------------------------------------------------------------------------------
 // Main
 // --------------------------------------------------------------------------------------
@@ -492,7 +592,7 @@ int main(){
     glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
     glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
     
-    GLFWwindow* window = glfwCreateWindow(800, 600, "PBR Renderer with ImGui, Normal Mapping & YAML Materials", nullptr, nullptr);
+    GLFWwindow* window = glfwCreateWindow(800, 600, "PBR Renderer with OBJ Models", nullptr, nullptr);
     if (!window){
         std::cerr << "Failed to create GLFW window!" << std::endl;
         glfwTerminate();
@@ -528,53 +628,96 @@ int main(){
     glDeleteShader(fragmentShader);
     
     // ----------------------------------------------------------------------------------
-    // Generate the sphere mesh (with position, normal, texcoords, tangent).
+    // Generate the sphere mesh.
     // ----------------------------------------------------------------------------------
     std::vector<float> sphereVertices;
     std::vector<unsigned int> sphereIndices;
+    // Reuse our earlier sphere generator that outputs: pos (3), normal (3), texcoord (2), tangent (3).
+    auto generateSphere = [&](std::vector<float>& vertices, std::vector<unsigned int>& indices, unsigned int X_SEGMENTS = 64, unsigned int Y_SEGMENTS = 64) {
+        vertices.clear();
+        indices.clear();
+        for (unsigned int y = 0; y <= Y_SEGMENTS; ++y) {
+            for (unsigned int x = 0; x <= X_SEGMENTS; ++x) {
+                float xSegment = static_cast<float>(x) / X_SEGMENTS;
+                float ySegment = static_cast<float>(y) / Y_SEGMENTS;
+                float xPos = std::cos(xSegment * 2.0f * IM_PI) * std::sin(ySegment * IM_PI);
+                float yPos = std::cos(ySegment * IM_PI);
+                float zPos = std::sin(xSegment * 2.0f * IM_PI) * std::sin(ySegment * IM_PI);
+                // Position.
+                vertices.push_back(xPos);
+                vertices.push_back(yPos);
+                vertices.push_back(zPos);
+                // Normal.
+                vertices.push_back(xPos);
+                vertices.push_back(yPos);
+                vertices.push_back(zPos);
+                // Texcoords.
+                vertices.push_back(xSegment);
+                vertices.push_back(ySegment);
+                // Tangent (simple approximation).
+                float tangentX = -std::sin(xSegment * 2.0f * IM_PI);
+                float tangentY = 0.0f;
+                float tangentZ = std::cos(xSegment * 2.0f * IM_PI);
+                vertices.push_back(tangentX);
+                vertices.push_back(tangentY);
+                vertices.push_back(tangentZ);
+            }
+        }
+        for (unsigned int y = 0; y < Y_SEGMENTS; ++y) {
+            for (unsigned int x = 0; x < X_SEGMENTS; ++x) {
+                unsigned int i0 = y * (X_SEGMENTS + 1) + x;
+                unsigned int i1 = i0 + 1;
+                unsigned int i2 = i0 + (X_SEGMENTS + 1);
+                unsigned int i3 = i2 + 1;
+                indices.push_back(i0);
+                indices.push_back(i2);
+                indices.push_back(i1);
+                indices.push_back(i1);
+                indices.push_back(i2);
+                indices.push_back(i3);
+            }
+        }
+    };
     generateSphere(sphereVertices, sphereIndices, 64, 64);
-    unsigned int indexCount = sphereIndices.size();
+    unsigned int sphereIndexCount = sphereIndices.size();
     
-    GLuint VAO, VBO, EBO;
+    GLuint sphereVAO, sphereVBO, sphereEBO;
-    glGenVertexArrays(1, &VAO);
+    glGenVertexArrays(1, &sphereVAO);
-    glGenBuffers(1, &VBO);
+    glGenBuffers(1, &sphereVBO);
-    glGenBuffers(1, &EBO);
+    glGenBuffers(1, &sphereEBO);
     
-    glBindVertexArray(VAO);
+    glBindVertexArray(sphereVAO);
-    glBindBuffer(GL_ARRAY_BUFFER, VBO);
+    glBindBuffer(GL_ARRAY_BUFFER, sphereVBO);
-    glBufferData(GL_ARRAY_BUFFER, sphereVertices.size() * sizeof(float), &sphereVertices[0], GL_STATIC_DRAW);
+    glBufferData(GL_ARRAY_BUFFER, sphereVertices.size() * sizeof(float), sphereVertices.data(), GL_STATIC_DRAW);
-    
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, sphereEBO);
-    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sphereIndices.size() * sizeof(unsigned int), sphereIndices.data(), GL_STATIC_DRAW);
-    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sphereIndices.size() * sizeof(unsigned int), &sphereIndices[0], GL_STATIC_DRAW);
+    // Layout: pos (3), normal (3), texcoords (2), tangent (3)
-    
-    // Vertex attributes: 0 = position (3), 1 = normal (3), 2 = texcoords (2), 3 = tangent (3).
     glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 11 * sizeof(float), (void*)0);
     glEnableVertexAttribArray(0);
-    
     glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 11 * sizeof(float), (void*)(3 * sizeof(float)));
     glEnableVertexAttribArray(1);
-    
     glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 11 * sizeof(float), (void*)(6 * sizeof(float)));
     glEnableVertexAttribArray(2);
-    
     glVertexAttribPointer(3, 3, GL_FLOAT, GL_FALSE, 11 * sizeof(float), (void*)(8 * sizeof(float)));
     glEnableVertexAttribArray(3);
     glBindVertexArray(0);
     
     // ----------------------------------------------------------------------------------
-    // Prepare scene data: a list of spheres.
+    // Prepare scene data.
     // ----------------------------------------------------------------------------------
     std::vector<SphereInstance> spheres;
-    // Add one default sphere.
     spheres.push_back({ glm::vec3(0.0f), 0.0f, Material() });
     
+    std::vector<Model> models; // For OBJ models.
+    
     // Global scene/light parameters.
     glm::vec3 camPos(0.0f, 0.0f, 5.0f);
     glm::vec3 lightPos(0.0f, 0.0f, 10.0f);
     glm::vec3 lightColor(300.0f, 300.0f, 300.0f);
     
-    // For YAML material loading via ImGui.
+    // For YAML loading and OBJ model loading via ImGui.
     static char yamlPathBuffer[256] = "";
+    static char objPathBuffer[256] = "";
     
     // ----------------------------------------------------------------------------------
     // Main render loop.
@@ -587,9 +730,7 @@ int main(){
         ImGui_ImplGlfw_NewFrame();
         ImGui::NewFrame();
         
-        // ----------------------------------------------------------------------------------
+        // ------------------------ Global Scene Controls ------------------------
-        // ImGui: Global Scene Controls.
-        // ----------------------------------------------------------------------------------
         {
             ImGui::Begin("Scene Controls");
             
@@ -599,113 +740,136 @@ int main(){
             ImGui::ColorEdit3("Light Color", glm::value_ptr(lightColor));
             ImGui::Separator();
             
-            // Button to add a new sphere.
+            // Sphere controls.
+            if (ImGui::CollapsingHeader("Spheres")) {
                 if (ImGui::Button("Add Sphere")) {
                     spheres.push_back({ glm::vec3(0.0f), 0.0f, Material() });
                 }
                 ImGui::Separator();
-            
-            // Global YAML material loader: set file path and add a sphere from YAML.
-            ImGui::InputText("YAML Material Path", yamlPathBuffer, sizeof(yamlPathBuffer));
-            if (ImGui::Button("Add Sphere from YAML Material")) {
-                Material matFromYAML = loadMaterialFromYAML(yamlPathBuffer);
-                spheres.push_back({ glm::vec3(0.0f), 0.0f, matFromYAML });
-            }
-            ImGui::Separator();
-            
-            // Per-sphere controls.
                 for (size_t i = 0; i < spheres.size(); i++) {
                     std::string header = "Sphere " + std::to_string(i);
                     if (ImGui::CollapsingHeader(header.c_str())) {
-                    // Transform controls.
+                        ImGui::DragFloat3(("Position##S" + std::to_string(i)).c_str(), glm::value_ptr(spheres[i].position), 0.1f);
-                    ImGui::DragFloat3(("Position##" + std::to_string(i)).c_str(), glm::value_ptr(spheres[i].position), 0.1f);
+                        ImGui::DragFloat(("Rotation (radians)##S" + std::to_string(i)).c_str(), &spheres[i].rotation, 0.01f);
-                    ImGui::DragFloat(("Rotation (radians)##" + std::to_string(i)).c_str(), &spheres[i].rotation, 0.01f);
+                        ImGui::ColorEdit3(("Albedo##S" + std::to_string(i)).c_str(), glm::value_ptr(spheres[i].material.albedo));
+                        ImGui::SliderFloat(("Metallic##S" + std::to_string(i)).c_str(), &spheres[i].material.metallic, 0.0f, 1.0f);
+                        ImGui::SliderFloat(("Roughness##S" + std::to_string(i)).c_str(), &spheres[i].material.roughness, 0.05f, 1.0f);
+                        ImGui::SliderFloat(("AO##S" + std::to_string(i)).c_str(), &spheres[i].material.ao, 0.0f, 1.0f);
                         
-                    // Material properties.
+                        // Texture controls...
-                    ImGui::ColorEdit3(("Albedo##" + std::to_string(i)).c_str(), glm::value_ptr(spheres[i].material.albedo));
+                        ImGui::InputText(("Albedo Texture Path##S" + std::to_string(i)).c_str(),
-                    ImGui::SliderFloat(("Metallic##" + std::to_string(i)).c_str(), &spheres[i].material.metallic, 0.0f, 1.0f);
-                    ImGui::SliderFloat(("Roughness##" + std::to_string(i)).c_str(), &spheres[i].material.roughness, 0.05f, 1.0f);
-                    ImGui::SliderFloat(("AO##" + std::to_string(i)).c_str(), &spheres[i].material.ao, 0.0f, 1.0f);
-                    
-                    // Texture map controls.
-                    ImGui::InputText(("Albedo Texture Path##" + std::to_string(i)).c_str(),
                                          spheres[i].material.albedoPath, sizeof(spheres[i].material.albedoPath));
-                    if (ImGui::Button(("Load Albedo Texture##" + std::to_string(i)).c_str())) {
+                        if (ImGui::Button(("Load Albedo Texture##S" + std::to_string(i)).c_str())) {
                             GLuint tex = LoadTexture(spheres[i].material.albedoPath);
                             if (tex != 0) {
                                 spheres[i].material.albedoTex = tex;
                                 spheres[i].material.useAlbedoMap = true;
                             }
                         }
-                    ImGui::InputText(("Metallic Texture Path##" + std::to_string(i)).c_str(),
+                        // Similar input/buttons for Metallic, Roughness, AO, and Normal...
+                        ImGui::InputText(("Metallic Texture Path##S" + std::to_string(i)).c_str(),
                                          spheres[i].material.metallicPath, sizeof(spheres[i].material.metallicPath));
-                    if (ImGui::Button(("Load Metallic Texture##" + std::to_string(i)).c_str())) {
+                        if (ImGui::Button(("Load Metallic Texture##S" + std::to_string(i)).c_str())) {
                             GLuint tex = LoadTexture(spheres[i].material.metallicPath);
                             if (tex != 0) {
                                 spheres[i].material.metallicTex = tex;
                                 spheres[i].material.useMetallicMap = true;
                             }
                         }
-                    ImGui::InputText(("Roughness Texture Path##" + std::to_string(i)).c_str(),
+                        ImGui::InputText(("Roughness Texture Path##S" + std::to_string(i)).c_str(),
                                          spheres[i].material.roughnessPath, sizeof(spheres[i].material.roughnessPath));
-                    if (ImGui::Button(("Load Roughness Texture##" + std::to_string(i)).c_str())) {
+                        if (ImGui::Button(("Load Roughness Texture##S" + std::to_string(i)).c_str())) {
                             GLuint tex = LoadTexture(spheres[i].material.roughnessPath);
                             if (tex != 0) {
                                 spheres[i].material.roughnessTex = tex;
                                 spheres[i].material.useRoughnessMap = true;
                             }
                         }
-                    ImGui::InputText(("AO Texture Path##" + std::to_string(i)).c_str(),
+                        ImGui::InputText(("AO Texture Path##S" + std::to_string(i)).c_str(),
                                          spheres[i].material.aoPath, sizeof(spheres[i].material.aoPath));
-                    if (ImGui::Button(("Load AO Texture##" + std::to_string(i)).c_str())) {
+                        if (ImGui::Button(("Load AO Texture##S" + std::to_string(i)).c_str())) {
                             GLuint tex = LoadTexture(spheres[i].material.aoPath);
                             if (tex != 0) {
                                 spheres[i].material.aoTex = tex;
                                 spheres[i].material.useAOMap = true;
                             }
                         }
-                    ImGui::InputText(("Normal Texture Path##" + std::to_string(i)).c_str(),
+                        ImGui::InputText(("Normal Texture Path##S" + std::to_string(i)).c_str(),
                                          spheres[i].material.normalPath, sizeof(spheres[i].material.normalPath));
-                    if (ImGui::Button(("Load Normal Texture##" + std::to_string(i)).c_str())) {
+                        if (ImGui::Button(("Load Normal Texture##S" + std::to_string(i)).c_str())) {
                             GLuint tex = LoadTexture(spheres[i].material.normalPath);
                             if (tex != 0) {
                                 spheres[i].material.normalTex = tex;
                                 spheres[i].material.useNormalMap = true;
                             }
                         }
-                    
-                    // YAML material reloading.
                         static char sphereYAMLPath[256] = "";
-                    ImGui::InputText(("YAML Material Path##" + std::to_string(i)).c_str(), sphereYAMLPath, sizeof(sphereYAMLPath));
+                        ImGui::InputText(("YAML Material Path##S" + std::to_string(i)).c_str(), sphereYAMLPath, sizeof(sphereYAMLPath));
-                    if (ImGui::Button(("Load Material from YAML##" + std::to_string(i)).c_str())) {
+                        if (ImGui::Button(("Load Material from YAML##S" + std::to_string(i)).c_str())) {
                             Material newMat = loadMaterialFromYAML(sphereYAMLPath);
                             spheres[i].material = newMat;
                         }
-                    
-                    // ---------------------------
-                    // Material Saving UI.
-                    // ---------------------------
-                    // We use a simple static buffer per sphere to specify a save file path.
                         static char saveYAMLPath[256] = "";
-                    ImGui::InputText(("Save YAML Path##" + std::to_string(i)).c_str(), saveYAMLPath, sizeof(saveYAMLPath));
+                        ImGui::InputText(("Save YAML Path##S" + std::to_string(i)).c_str(), saveYAMLPath, sizeof(saveYAMLPath));
-                    if (ImGui::Button(("Save Material to YAML##" + std::to_string(i)).c_str())) {
+                        if (ImGui::Button(("Save Material to YAML##S" + std::to_string(i)).c_str())) {
                             if (saveMaterialToYAML(std::string(saveYAMLPath), spheres[i].material)) {
                                 std::cout << "Saved material for sphere " << i << " to " << saveYAMLPath << std::endl;
                             }
                         }
-                    
+                        if (ImGui::Button(("Remove Sphere##S" + std::to_string(i)).c_str())) {
-                    if (ImGui::Button(("Remove Sphere##" + std::to_string(i)).c_str())) {
                             spheres.erase(spheres.begin() + i);
                             break;
                         }
                     }
                 }
+            }
+            
+            // Model (OBJ) controls.
+            if (ImGui::CollapsingHeader("3D Models (OBJ)")) {
+                ImGui::InputText("OBJ Model Path", objPathBuffer, sizeof(objPathBuffer));
+                if (ImGui::Button("Load OBJ Model")) {
+                    Model m = loadModelFromOBJ(std::string(objPathBuffer));
+                    if(m.indexCount > 0) {
+                        models.push_back(m);
+                    }
+                }
+                ImGui::Separator();
+                for (size_t i = 0; i < models.size(); i++) {
+                    std::string header = "Model " + std::to_string(i) + " [" + models[i].filename + "]";
+                    if (ImGui::CollapsingHeader(header.c_str())) {
+                        ImGui::DragFloat3(("Position##M" + std::to_string(i)).c_str(), glm::value_ptr(models[i].position), 0.1f);
+                        ImGui::DragFloat(("Rotation (radians)##M" + std::to_string(i)).c_str(), &models[i].rotation, 0.01f);
+                        ImGui::ColorEdit3(("Albedo##M" + std::to_string(i)).c_str(), glm::value_ptr(models[i].material.albedo));
+                        ImGui::SliderFloat(("Metallic##M" + std::to_string(i)).c_str(), &models[i].material.metallic, 0.0f, 1.0f);
+                        ImGui::SliderFloat(("Roughness##M" + std::to_string(i)).c_str(), &models[i].material.roughness, 0.05f, 1.0f);
+                        ImGui::SliderFloat(("AO##M" + std::to_string(i)).c_str(), &models[i].material.ao, 0.0f, 1.0f);
+                        // Similar texture controls as for spheres.
+                        ImGui::InputText(("Albedo Texture Path##M" + std::to_string(i)).c_str(),
+                                         models[i].material.albedoPath, sizeof(models[i].material.albedoPath));
+                        if (ImGui::Button(("Load Albedo Texture##M" + std::to_string(i)).c_str())) {
+                            GLuint tex = LoadTexture(models[i].material.albedoPath);
+                            if (tex != 0) {
+                                models[i].material.albedoTex = tex;
+                                models[i].material.useAlbedoMap = true;
+                            }
+                        }
+                        // ... (Repeat for other maps: Metallic, Roughness, AO, Normal)
+                        if (ImGui::Button(("Remove Model##M" + std::to_string(i)).c_str())) {
+                            // Delete GL buffers.
+                            glDeleteVertexArrays(1, &models[i].VAO);
+                            glDeleteBuffers(1, &models[i].VBO);
+                            glDeleteBuffers(1, &models[i].EBO);
+                            models.erase(models.begin() + i);
+                            break;
+                        }
+                    }
+                }
+            }
+            
             ImGui::End();
         }
         
-        // ----------------------------------------------------------------------------------
+        // ---------------------- Rendering ----------------------
-        // Rendering.
-        // ----------------------------------------------------------------------------------
         int width, height;
         glfwGetFramebufferSize(window, &width, &height);
         float aspect = width / static_cast<float>(height);
@@ -713,7 +877,6 @@ int main(){
         glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
         
-        // Setup camera matrices.
         glm::mat4 projection = glm::perspective(glm::radians(45.0f), aspect, 0.1f, 100.0f);
         glm::mat4 view = glm::lookAt(camPos, glm::vec3(0.0f), glm::vec3(0.0, 1.0, 0.0));
         
@@ -721,33 +884,26 @@ int main(){
         glUniformMatrix4fv(glGetUniformLocation(shaderProgram, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
         glUniformMatrix4fv(glGetUniformLocation(shaderProgram, "view"), 1, GL_FALSE, glm::value_ptr(view));
         glUniform3fv(glGetUniformLocation(shaderProgram, "camPos"), 1, glm::value_ptr(camPos));
-        // Set light uniforms.
         glUniform3fv(glGetUniformLocation(shaderProgram, "lightPos"), 1, glm::value_ptr(lightPos));
         glUniform3fv(glGetUniformLocation(shaderProgram, "lightColor"), 1, glm::value_ptr(lightColor));
-        // Pass ImGui's internal PI constant.
         glUniform1f(glGetUniformLocation(shaderProgram, "PI"), IM_PI);
         
-        glBindVertexArray(VAO);
+        // Render spheres.
+        glBindVertexArray(sphereVAO);
         for (const auto& sphere : spheres) {
-            // Compute model matrix.
             glm::mat4 model = glm::translate(glm::mat4(1.0f), sphere.position);
             model = glm::rotate(model, sphere.rotation, glm::vec3(0.0f, 1.0f, 0.0f));
             glUniformMatrix4fv(glGetUniformLocation(shaderProgram, "model"), 1, GL_FALSE, glm::value_ptr(model));
             
-            // Set fallback material uniforms.
             glUniform3fv(glGetUniformLocation(shaderProgram, "albedo"), 1, glm::value_ptr(sphere.material.albedo));
             glUniform1f(glGetUniformLocation(shaderProgram, "metallic"), sphere.material.metallic);
             glUniform1f(glGetUniformLocation(shaderProgram, "roughness"), sphere.material.roughness);
             glUniform1f(glGetUniformLocation(shaderProgram, "ao"), sphere.material.ao);
-            
-            // Set texture usage flags.
             glUniform1i(glGetUniformLocation(shaderProgram, "useAlbedoMap"), sphere.material.useAlbedoMap ? 1 : 0);
             glUniform1i(glGetUniformLocation(shaderProgram, "useMetallicMap"), sphere.material.useMetallicMap ? 1 : 0);
             glUniform1i(glGetUniformLocation(shaderProgram, "useRoughnessMap"), sphere.material.useRoughnessMap ? 1 : 0);
             glUniform1i(glGetUniformLocation(shaderProgram, "useAOMap"), sphere.material.useAOMap ? 1 : 0);
             glUniform1i(glGetUniformLocation(shaderProgram, "useNormalMap"), sphere.material.useNormalMap ? 1 : 0);
-            
-            // Bind textures if enabled.
             if (sphere.material.useAlbedoMap) {
                 glActiveTexture(GL_TEXTURE0);
                 glBindTexture(GL_TEXTURE_2D, sphere.material.albedoTex);
@@ -774,11 +930,57 @@ int main(){
                 glUniform1i(glGetUniformLocation(shaderProgram, "normalMap"), 4);
             }
             
-            glDrawElements(GL_TRIANGLES, indexCount, GL_UNSIGNED_INT, 0);
+            glDrawElements(GL_TRIANGLES, sphereIndexCount, GL_UNSIGNED_INT, 0);
         }
         glBindVertexArray(0);
         
-        // Render ImGui over the scene.
+        // Render OBJ models.
+        for (const auto& m : models) {
+            glm::mat4 model = glm::translate(glm::mat4(1.0f), m.position);
+            model = glm::rotate(model, m.rotation, glm::vec3(0.0f, 1.0f, 0.0f));
+            glUniformMatrix4fv(glGetUniformLocation(shaderProgram, "model"), 1, GL_FALSE, glm::value_ptr(model));
+            
+            glUniform3fv(glGetUniformLocation(shaderProgram, "albedo"), 1, glm::value_ptr(m.material.albedo));
+            glUniform1f(glGetUniformLocation(shaderProgram, "metallic"), m.material.metallic);
+            glUniform1f(glGetUniformLocation(shaderProgram, "roughness"), m.material.roughness);
+            glUniform1f(glGetUniformLocation(shaderProgram, "ao"), m.material.ao);
+            glUniform1i(glGetUniformLocation(shaderProgram, "useAlbedoMap"), m.material.useAlbedoMap ? 1 : 0);
+            glUniform1i(glGetUniformLocation(shaderProgram, "useMetallicMap"), m.material.useMetallicMap ? 1 : 0);
+            glUniform1i(glGetUniformLocation(shaderProgram, "useRoughnessMap"), m.material.useRoughnessMap ? 1 : 0);
+            glUniform1i(glGetUniformLocation(shaderProgram, "useAOMap"), m.material.useAOMap ? 1 : 0);
+            glUniform1i(glGetUniformLocation(shaderProgram, "useNormalMap"), m.material.useNormalMap ? 1 : 0);
+            if (m.material.useAlbedoMap) {
+                glActiveTexture(GL_TEXTURE0);
+                glBindTexture(GL_TEXTURE_2D, m.material.albedoTex);
+                glUniform1i(glGetUniformLocation(shaderProgram, "albedoMap"), 0);
+            }
+            if (m.material.useMetallicMap) {
+                glActiveTexture(GL_TEXTURE1);
+                glBindTexture(GL_TEXTURE_2D, m.material.metallicTex);
+                glUniform1i(glGetUniformLocation(shaderProgram, "metallicMap"), 1);
+            }
+            if (m.material.useRoughnessMap) {
+                glActiveTexture(GL_TEXTURE2);
+                glBindTexture(GL_TEXTURE_2D, m.material.roughnessTex);
+                glUniform1i(glGetUniformLocation(shaderProgram, "roughnessMap"), 2);
+            }
+            if (m.material.useAOMap) {
+                glActiveTexture(GL_TEXTURE3);
+                glBindTexture(GL_TEXTURE_2D, m.material.aoTex);
+                glUniform1i(glGetUniformLocation(shaderProgram, "aoMap"), 3);
+            }
+            if (m.material.useNormalMap) {
+                glActiveTexture(GL_TEXTURE4);
+                glBindTexture(GL_TEXTURE_2D, m.material.normalTex);
+                glUniform1i(glGetUniformLocation(shaderProgram, "normalMap"), 4);
+            }
+            
+            glBindVertexArray(m.VAO);
+            glDrawElements(GL_TRIANGLES, m.indexCount, GL_UNSIGNED_INT, 0);
+            glBindVertexArray(0);
+        }
+        
+        // Render ImGui.
         ImGui::Render();
         ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
         
@@ -788,9 +990,14 @@ int main(){
     // ----------------------------------------------------------------------------------
     // Cleanup.
     // ----------------------------------------------------------------------------------
-    glDeleteVertexArrays(1, &VAO);
+    glDeleteVertexArrays(1, &sphereVAO);
-    glDeleteBuffers(1, &VBO);
+    glDeleteBuffers(1, &sphereVBO);
-    glDeleteBuffers(1, &EBO);
+    glDeleteBuffers(1, &sphereEBO);
+    for (auto& m : models) {
+        glDeleteVertexArrays(1, &m.VAO);
+        glDeleteBuffers(1, &m.VBO);
+        glDeleteBuffers(1, &m.EBO);
+    }
     glDeleteProgram(shaderProgram);
     
     ImGui_ImplOpenGL3_Shutdown();

physicaly-based-renderer/sponza.mtl

@@ -0,0 +1,306 @@
+# Blender MTL File: 'None'
+# Material Count: 25
+
+newmtl Material__25
+Ns 7.843137
+Ka 0.000000 0.000000 0.000000
+Kd 0.470400 0.470400 0.470400
+Ks 0.000000 0.000000 0.000000
+Ni 1.000000
+d 0.000000
+illum 2
+map_Kd textures/lion.tga
+map_Disp textures/lion_ddn.tga
+map_Ka textures/lion.tga
+
+newmtl Material__298
+Ns 7.843137
+Ka 0.000000 0.000000 0.000000
+Kd 0.470400 0.470400 0.470400
+Ks 0.000000 0.000000 0.000000
+Ni 1.000000
+d 0.000000
+illum 2
+map_Kd textures/background.tga
+map_Disp textures/background_ddn.tga
+map_Ka textures/background.tga
+
+newmtl Material__47
+Ns 7.843137
+Ka 0.000000 0.000000 0.000000
+Kd 0.470400 0.470400 0.470400
+Ks 0.000000 0.000000 0.000000
+Ni 1.000000
+d 0.000000
+illum 2
+
+
+newmtl Material__57
+Ns 7.843137
+Ka 0.000000 0.000000 0.000000
+Kd 0.470400 0.470400 0.470400
+Ks 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+map_Kd textures/vase_plant.tga
+map_d textures/vase_plant_mask.tga
+map_Ka textures/vase_plant.tga
+
+newmtl arch
+Ns 7.843137
+Ka 0.000000 0.000000 0.000000
+Kd 0.470400 0.470400 0.470400
+Ks 0.000000 0.000000 0.000000
+Ni 1.000000
+d 0.000000
+illum 2
+map_Kd textures/sponza_arch_diff.tga
+map_Ka textures/sponza_arch_diff.tga
+map_Disp textures/sponza_arch_ddn.tga
+
+newmtl bricks
+Ns 7.843137
+Ka 0.000000 0.000000 0.000000
+Kd 0.470400 0.470400 0.470400
+Ks 0.000000 0.000000 0.000000
+Ni 1.000000
+d 0.000000
+illum 2
+map_Kd textures/spnza_bricks_a_diff.tga
+map_Disp textures/spnza_bricks_a_ddn.tga
+map_Ka textures/spnza_bricks_a_diff.tga
+
+newmtl ceiling
+Ns 7.843137
+Ka 0.000000 0.000000 0.000000
+Kd 0.470400 0.470400 0.470400
+Ks 0.000000 0.000000 0.000000
+Ni 1.000000
+d 0.000000
+illum 2
+map_Kd textures/sponza_ceiling_a_diff.tga
+map_Ka textures/sponza_ceiling_a_diff.tga
+map_Disp textures/sponza_ceiling_a_ddn.tga
+
+newmtl chain
+Ns 7.843137
+Ka 0.000000 0.000000 0.000000
+Kd 0.470400 0.470400 0.470400
+Ks 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+map_Kd textures/chain_texture.tga
+map_d textures/chain_texture_mask.tga
+map_Disp textures/chain_texture_ddn.tga
+map_Ka textures/chain_texture.tga
+
+newmtl column_a
+Ns 7.843137
+Ka 0.000000 0.000000 0.000000
+Kd 0.470400 0.470400 0.470400
+Ks 0.000000 0.000000 0.000000
+Ni 1.000000
+d 0.000000
+illum 2
+map_Kd textures/sponza_column_a_diff.tga
+map_Disp textures/sponza_column_a_ddn.tga
+map_Ka textures/sponza_column_a_diff.tga
+
+newmtl column_b
+Ns 7.843137
+Ka 0.000000 0.000000 0.000000
+Kd 0.470400 0.470400 0.470400
+Ks 0.000000 0.000000 0.000000
+Ni 1.000000
+d 0.000000
+illum 2
+map_Kd textures/sponza_column_b_diff.tga
+map_Disp textures/sponza_column_b_ddn.tga
+map_Ka textures/sponza_column_b_diff.tga
+
+newmtl column_c
+Ns 7.843137
+Ka 0.000000 0.000000 0.000000
+Kd 0.470400 0.470400 0.470400
+Ks 0.000000 0.000000 0.000000
+Ni 1.000000
+d 0.000000
+illum 2
+map_Kd textures/sponza_column_c_diff.tga
+map_Disp textures/sponza_column_c_ddn.tga
+map_Ka textures/sponza_column_c_diff.tga
+
+newmtl details
+Ns 7.843137
+Ka 0.000000 0.000000 0.000000
+Kd 0.470400 0.470400 0.470400
+Ks 0.000000 0.000000 0.000000
+Ni 1.000000
+d 0.000000
+illum 2
+map_Kd textures/sponza_details_diff.tga
+map_Ka textures/sponza_details_diff.tga
+map_Disp textures/sponza_details_ddn.tga
+
+newmtl fabric_a
+Ns 7.843137
+Ka 0.000000 0.000000 0.000000
+Kd 0.470400 0.470400 0.470400
+Ks 0.000000 0.000000 0.000000
+Ni 1.000000
+d 0.000000
+illum 2
+map_Kd textures/sponza_fabric_diff.tga
+map_Ka textures/sponza_fabric_diff.tga
+map_Disp textures/sponza_fabric_ddn.tga
+
+newmtl fabric_c
+Ns 7.843137
+Ka 0.000000 0.000000 0.000000
+Kd 0.470400 0.470400 0.470400
+Ks 0.000000 0.000000 0.000000
+Ni 1.000000
+d 0.000000
+illum 2
+map_Kd textures/sponza_curtain_diff.tga
+map_Ka textures/sponza_curtain_diff.tga
+map_Disp textures/sponza_curtain_ddn.tga
+
+
+newmtl fabric_d
+Ns 7.843137
+Ka 0.000000 0.000000 0.000000
+Kd 0.470400 0.470400 0.470400
+Ks 0.000000 0.000000 0.000000
+Ni 1.000000
+d 0.000000
+illum 2
+map_Kd textures/sponza_fabric_blue_diff.tga
+map_Ka textures/sponza_fabric_blue_diff.tga
+map_Disp textures/sponza_fabric_ddn.tga
+
+
+newmtl fabric_e
+Ns 7.843137
+Ka 0.000000 0.000000 0.000000
+Kd 0.470400 0.470400 0.470400
+Ks 0.000000 0.000000 0.000000
+Ni 1.000000
+d 0.000000
+illum 2
+map_Kd textures/sponza_fabric_green_diff.tga
+map_Ka textures/sponza_fabric_green_diff.tga
+map_Disp textures/sponza_fabric_ddn.tga
+
+
+newmtl fabric_f
+Ns 7.843137
+Ka 0.000000 0.000000 0.000000
+Kd 0.470400 0.470400 0.470400
+Ks 0.000000 0.000000 0.000000
+Ni 1.000000
+d 0.000000
+illum 2
+map_Kd textures/sponza_curtain_green_diff.tga
+map_Ka textures/sponza_curtain_green_diff.tga
+map_Disp textures/sponza_curtain_ddn.tga
+
+newmtl fabric_g
+Ns 7.843137
+Ka 0.000000 0.000000 0.000000
+Kd 0.470400 0.470400 0.470400
+Ks 0.000000 0.000000 0.000000
+Ni 1.000000
+d 0.000000
+illum 2
+map_Kd textures/sponza_curtain_blue_diff.tga
+map_Ka textures/sponza_curtain_blue_diff.tga
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