Can load the backpack model and if you hit R it will be made of glass.

24-cubemaps/config.json

@@ -1,6 +1,10 @@
 {
   "scene": {
     "shader": {
+      "vertex_path": "shaders/21-framebuffers.vert.glsl",
+      "frag_path": "shaders/21-framebuffers.frag.glsl"
+    },
+    "reflect_shader": {
       "vertex_path": "shaders/24-vert.glsl",
       "frag_path": "shaders/24-frag.glsl"
     },
@@ -50,18 +54,18 @@
       "window": {
         "directory": "assets",
         "model_path": "window.glb"
+      },
+      "backpack": {
+        "directory": "assets/backpack",
+        "model_path": "backpack.obj"
       }
     },
     "things": [
-      {"model": "marble_cube", "position": [1.5,  0.0, -1.0],
+      {"model": "backpack", "position": [1.5,  0.0, -1.0],
         "rotation": {"angle": 0.0, "axes": [1.0, 1.0, 1.0]},
-        "scale": 2.0,
-        "material": "default"},
-      {"model": "window", "position": [1.5,  0.25,  0.0],
-        "rotation": {"angle": 90.0, "axes": [1.0,0.0,0.0]},
         "scale": 1.0,
-        "material": "shiny"},
+        "material": "default"},
-      {"model": "window", "position": [1.75,  0.25,  0.25],
+      {"model": "marble_cube", "position": [1.5,  0.25,  0.0],
         "rotation": {"angle": 90.0, "axes": [1.0,0.0,0.0]},
         "scale": 1.0,
         "material": "shiny"}

24-cubemaps/src/components.hpp

@@ -102,6 +102,7 @@ namespace components {
 
   struct Scene {
     components::Shader shader;
+    components::Shader reflect_shader;
     components::Shader screen_shader;
     components::Shader skybox_shader;
     std::vector<std::string> skybox_faces;
@@ -112,5 +113,5 @@ namespace components {
     Lighting light;
   };
 
-  ENROLL_COMPONENT(Scene, shader, screen_shader, skybox_shader, skybox_faces, materials, models, things, camera, light);
+  ENROLL_COMPONENT(Scene, shader, reflect_shader, screen_shader, skybox_shader, skybox_faces, materials, models, things, camera, light);
 }

24-cubemaps/src/main.cpp

@@ -70,6 +70,10 @@ void process_input(GLFWwindow *window, Scene& scene) {
     scene.camera.right();
   }
 
+  if(glfwGetKey(window, GLFW_KEY_R) == GLFW_PRESS) {
+    scene.reflect_on = !scene.reflect_on;
+  }
+
   if(glfwGetKey(window, GLFW_KEY_M) == GLFW_PRESS) {
     components::Rotation rotation{90.0f, {1.0f, 0.0f, 0.0f}};
     scene.spawn("grass", scene.camera.position, rotation);

24-cubemaps/src/scene.cpp

@@ -31,12 +31,14 @@ void Scene::draw_thing(Shader& with_shader, Thing& thing)
 
   with_shader.setMat4("model", model);
 
-  thing.model.draw(with_shader, false);
+  // !reflect_on turns it on? yeah weird
+  thing.model.draw(with_shader, !reflect_on);
 }
 
 void Scene::render(GLFWwindow* window) {
   glm::mat4 view = camera.look_at();
   glm::mat4 projection = glm::mat4(1.0f);
+  auto& with_shader = reflect_on ? reflect_shader : shader;
 
   // fov, aspect, near plane, far plane
   projection = glm::perspective(glm::radians(camera.fov), (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
@@ -44,13 +46,13 @@ void Scene::render(GLFWwindow* window) {
   framebuffer.begin();
 
   // render the scene
-  shader.use();
+  with_shader.use();
-  shader.setMat4("view", view);
+  with_shader.setMat4("view", view);
-  shader.setMat4("projection", projection);
+  with_shader.setMat4("projection", projection);
-  shader.setVec3("cameraPos", camera.position);
+  with_shader.setVec3("cameraPos", camera.position);
 
   for(auto& thing : things) {
-    draw_thing(shader, thing);
+    draw_thing(with_shader, thing);
   }
 
   render_skybox(projection);

24-cubemaps/src/scene.hpp

@@ -27,6 +27,7 @@ struct Thing {
 
 struct Scene {
   Shader shader;
+  Shader reflect_shader;
   Shader skybox_shader;
   std::vector<std::string> skybox_faces;
   Screen screen;
@@ -42,9 +43,11 @@ struct Scene {
   unsigned int skyboxVAO = 0;
   unsigned int skyboxVBO = 0;
   unsigned int skybox_texture_id = 0;
+  bool reflect_on = false;
 
   Scene(components::Scene& config):
     shader{config.shader.vertex_path, config.shader.frag_path},
+    reflect_shader{config.reflect_shader.vertex_path, config.reflect_shader.frag_path},
     skybox_shader{config.skybox_shader.vertex_path, config.skybox_shader.frag_path},
     skybox_faces{config.skybox_faces},
     screen{.shader={config.screen_shader.vertex_path, config.screen_shader.frag_path}},