Compute Shader Mesh Path Tracing

Path tracing engine to raytrace meshes from Unity GameObjects. Implemented using HLSL compute shaders in Unity3D.

Currently implemented:

• Pathtracing for meshes from Unity GameObjects.
• Phong specular reflections.
• Variable surface roughness for specular reflections.
• Lambert diffuse relections.
• Importance sampling to speed-up convergence.
• Support for normal interpolation using barycentric coordinates.
• Anti-Aliasing by offset resampling.
• Basic ray-collision-detection optimization using bounding sphere volumes.

Possible extensions:

• Translucent materials.
• Directional lights + multi-importance sampling (see https://graphics.stanford.edu/courses/cs348b-03/papers/veach-chapter9.pdf).
• Improved ray-collision-detection optimization (e.g. BVH/kD tree/etc.)

Screenshots

Normal interpolation visualised by interpolating vertex colors.