Introduction

Photon is a simple Monte-Carlo path tracer made out of my personal interest in computer graphics. The engine served as a playground as I learned and tried to implement new graphics stuff. The core of the renderer is written in Java, and supports path tracing primarily. Its acceleration structure is a kD-tree with optimal SAH splits (when filled with triangle mesh). The material system is based on Cook-Torrance BSDF, which is famous for its physics-based derivation and modulable surface roughness.

List of Main Features

• Primitive intersection test
  • Ray-sphere intersection
  • Ray-triangle intersection
• Anti-aliasing samples
• kD-tree with optimal SAH splits
• Physically based materials
  • Lambertian diffuse
  • Cook-Torrance microfacet model (both BRDF & BTDF variants)
  • Supports MERL BRDF database
• Texture for material & emission
• Fully support .obj model (with .mtl loading)
• Dynamic camera control during rendering (WASD-style movement)

Images

Crytek Sponza

Golden Stanford Dragon

Classic Material Matrix

Transparent Stanford Bunny

Stanford Dragon with MERL Material (gold paint)

More on the Project

• This is an open-source project. Full source code available.