+ Texture2D depth_buf;
+ Face faces[6];
+
+ TextureCube irradiance;
+ const Program &irradiance_shprog;
+ Framebuffer irradiance_fbo;
+ const Program &specular_shprog;
+ std::vector<Framebuffer> specular_fbos;
+ ProgramData prefilter_shdata;
+ const Mesh &fullscreen_mesh;
+