This is a playground repository for ray tracing-related experiments. The implementation is done from scratch, using CPU, and referencing various resources, especially Physically Based Rendering From Theory to Implementation.

• Support for acceleration with CPU SIMD
  • Architectures
    • Arm Neon
    • SSE/AVX (No support for AVX-512)
  • Computations
    • N rays - triangle intersection
    • Ray - N triangles intersection
    • N rays - BBox intersection
    • Ray - BBox intersection
    • Bilinear filtering
• Acceleration structures
  • BVH for triangle mesh
    • Two children, and multiple triangles in leaf node
• Ray packet tracing
  • Primary rays
  • Occlude rays
  • Secondary rays/binning
  • Compaction
• Path tracing
  • Indirect diffuse
  • Perfect specular
  • Emissive
  • BSDF
  • Refraction
  • Volumetric
• Direct lights
  • Directional light
  • Infinite area light
  • Point light
  • Spot light
• Texture mapping
  • Diffuse
  • Alpha mask
  • Bump
  • Bilinear filtering
  • Mipmapping
  • Tiled access
• Camera

The code is developed primarily on macOS, but should work on other platforms.

• macOS x86/Apple M1
• Windows/ARM/x64
• Raspberry Pi

Use CMake to build

san-miguel-low-poly from https://casual-effects.com/data/

Crytek Sponza from https://casual-effects.com/data/

https://developer.nvidia.com/orca/beeple-zero-day

• stb
• tinyobjloader
• Tiny OpenEXR image library

• Physically Based Rendering From Theory to Implementation
• Watertight Ray/Triangle Intersection
• Fast, minimum storage ray/triangle intersection
• Spatial Splits in Bounding Volume Hierarchies
• Getting rid of packets - Efficient SIMD single-ray traversal using multi-branching BVHs -