Simple but optimized CPU path tracer based on Peter Shirley’s ray tracing series.

During the summer of 2019, I wrote a simple CPU path tracer based on Peter Shirley’s Ray Tracing in One Weekend series. You can find it on GitHub.

It supports the following features:

• Material-sampled path tracing
• Diffuse, glossy, and transparent materials
• Depth of field
• Motion blur
• Bounding volume hierarchy for intersection queries
• Solid texturing with Perlin noise
• Texture maps
• Emissive lights
• Homogeneous volumetric scattering (also used for subsurface scattering)
• Rendering GUI

Additionally, I implemented the following performance optimizations:

• Switching the guide’s OOP style to a data-oriented design
• Tiled multi-threaded rendering
• SIMD vector math and intersection logic

Results