CUDA Path Tracer

Features

• Wavefront Path Tracing
  • Sperating megakernels into several kernels: RayGen, Intersection, Shade ...
  • Less Warp Divergence: Stream compacting the ray path segments
  • Improve Memory Access Coalescing: SoA data layout and sorting path segments by material type before shading
• Texture Mapping: More surface color based on CUDA Texture Object
• Triangle Primitive Mesh: More shapes based on Obj loader
• Accelerate Data Structure BVH:
  • Binary Radix Tree Construction
  • Parallel Tree Traversal
  • Two Level Acceleration Structures: world level (TLAS) & model level (BLAS)
• Efficient Monte Carlo Integrator:
  • Next Event Estimation: Shadow rays are explicitly aimed at light sources
  • Multiple Importance Sampling: Combining the PDFs of different sampling techniques
• Physically Based Rendering:
  • Diffuse (Lambertian)
  • Fresnel Reflection

Screenshots

Dependencies

• CUDA
• OpenGL
• GLFW
• GLEW
• GLM
• ImGui
• Stb Image
• Tinygltf
• Tinyobj loader
• nlohmann-json

Reference

• CIS 5650 GPU Programming and Architecture
• Physically Based Rendering V4
• GPU-Raytracer (Open Source Code)