Final evaluation for Implementing Oren-Nayar BRDF and Creating New Scene

[sps1112]

• Implemented Oren Nayer BRDF
• Updated to a simplified version
• Also added a simple Phong BRDF based on the old BRDF
• Added 2 new balls in the scene
• Attaching screenshots of new scene
  • Diffuse BRDF at 256 samples
    
  • Oren Nayar BRDF at 256 samples
    
  • Final Scene at 1024 samples with New balls, background and camera pos
  • Red and Blue ball use Oren-Nayar while yellow uses Phong BRDF