Hobby ray/path tracer in C++.

• Path tracer
• Support a variety of materials and reflection / transmission models
• Acceleration structures
  • bounding volume hierarchy
  • kd-tree
• Import a variety of scene / object description grammars
  • .pbrt
  • .obj
  • .ply
• Render paths
  • vanilla CPU
  • Explicit SPMD with ispc
  • CUDA
  • Rasterization with OpenGL (or Vulkan)

Lambertian reflection:

Specular reflection:

Instancing:

Bounding-volume hierarchy heatmap:

Triangle intersection heatmap:

In elementary geometry, a polytope is a geometric object with "flat" sides. It is a generalisation in any number of dimensions of the three-dimensional polyhedron. Polytopes may exist in any general number of dimensions n as an n-dimensional polytope or n-polytope.

https://en.wikipedia.org/wiki/Polytope

Polytope represents all shapes internally as triangle meshes, which are 3-polytopes. Input grammars that specify other types of geometry (implicit surfaces, etc) are tesselated on import to triangle meshes.

The structure and terminology of this project is inspired by pbrt (https://github.com/mmp/pbrt-v3). My MO is generally to:

1. Originally develop and implement a feature to the point that it works; and then
2. See how the pros did it; and then
3. Adjust my own implementation if necessary / desired.

This project uses code from the following libraries / projects:

• pbrt
  • https://github.com/mmp/pbrt-v3
  • Matrices and transforms
• Google Test
  • https://github.com/google/googletest
  • Unit testing
• LodePNG
  • https://github.com/lvandeve/lodepng
  • For exporting raw image data to PNG