struct polygon {
  int a, b, c, d;
  int material_index;
  int uv_index;
};

struct mesh_material {
  int width;
  int height;
  int offset;
};

struct mesh {
  const vec3 * position;
  const int position_length;
  const vec3 * normal;
  const int normal_length;
  const vec3 * polygon_normal;
  const int polygon_normal_length;
  const polygon * polygons;
  const int polygons_length;
  const vec2 ** uv_layers;
  const int uv_layers_length;
  const mesh_material * materials;
  const int materials_length;
};

struct object {
  const struct mesh * mesh;
  const vec3 scale;
  const vec4 rotation;
  const vec3 location;
};

struct material {
  void * start;
  int size;
  int offset;
};