text: #ifndef DIFFUSE_H_
  #define DIFFUSE_H_
  
  #include <glm/glm.hpp>
  #include "brdf.h"
  
  class Diffuse : public BRDF
  {
  public:
  
  	Diffuse ( glm::vec3 reflectance );
  
  	glm::vec3 fr();
  
  };
  
  
  #endif /* DIFFUSE_H_ */
  