text: #ifndef BERRY3D_PLANE_H
  #define BERRY3D_PLANE_H
  
  #include "item.h"
  
  namespace Berry3D {
      class Plane : public Entity {
      public:
          Plane(float w = 1, float h = 1) : Entity(sqrt(w * w + h * h)) {
              points.push_back(new Vector3(w, h, 0));
              points.push_back(new Vector3(-w, h, 0));
              points.push_back(new Vector3(w, -h, 0));
              planes.push_back(new PlaneEle(new Vector3(0, 0, 0), 0, 1, 2));
          }
          ~Plane() { }
      private:
      };
  }
  
  #endif //BERRY3D_PLANE_H
  