SORT is short for Simple Open-source Ray Tracing. It is a physically based renderer that I initiated a couple of years ago, which is quite simlilar to PBRT, because I wrote the whole renderer after reading pbrt several times and I'd like to enhance my understanding on offline rendering with this small project. SORT is cross-platform, it works well on Windows, Mac and Ubuntu.

Here are the features implemented so far:

• Integrator. (Whitted ray tracing, direct lighting, path tracing, light tracing, bidirectional path tracing, instant radiosity, ambient occlusion)
• Spatial acceleration structure. (KD-Tree, BVH, Uniform grid, OcTree)
• Sampler. (Regular, random, stratified)
• BXDF. (Lambert, Oran Nayar, MicroFacet, MERL)
• Node graph based material system.
• Camera. (DOF)
• Multi-thread rendering.
• Blender plugin. (Working on it these days.)

Here is a screen shot of SORT working in Blender