Added mip selection using ray differentials

header/Material/Material.h

@@ -33,6 +33,10 @@ typedef struct
     const triangle_collection_t* triangles;
     const light_collection_t* lights;
     const texture_collection_t* textures;
+
+    uint64_t triangle_id;
+    float cone_width;
+    float spread_angle;
 } shading_context_t;
 
 typedef path_output (*material_render_loop_f)(const void* properties, const shading_context_t* context);