adding brdf, but virtual is probably terrible for performance

src/util/Model.h

@@ -1,20 +1,14 @@
 #pragma once
 #include "Minimal.h"
+#include "Material.h"
 #include "scene/AABB.h"
 #include <optional>
 #include <vector>
 
-// material infos
-// shading parameter
-// hit data
 struct IntersectionInfo
 {
-  float t;
-  glm::vec3 position;
-  glm::vec3 normal;
-  glm::vec3 albedo;
-  glm::vec3 emissive;
-  //....
+  HitInfo hitInfo;
+  MaterialInfo shadingInfo;
 };
 class Model
 {