Zillum

CPU Physically Based Renderer

Implemented light transport methods

Path Tracing
Adjoint Particle Tracing (Light Tracing)
Bidirectional Path Tracing

Other features

Microfacet BSDF
Environment light importance sampling
MTBVH
Sobol sampler

Currently or potentially working on

Photon Mapping family (PM, PPM, SPPM)
Metropolis Light Transport
BSSRDF
Participating Media
VERTEX CONNECTION AND MERGING
...

Bidirectional Path Tracing

Visualization of different connection strategies and their MIS weights

Unweighted, MIS weight, weighted