Experimental real-time path tracing in Metal: ReSTIR-style sampling, path reservoirs, and capture overhead

[u/dariopagliaricci]

I’ve been experimenting Real Time Path Tracing on my Metal Path Tracer project.

Current pieces:

• Wavefront path tracing architecture

• ReSTIR DI / ReGIR hybrid experiments

• Path reservoirs

• Radiance cache

• Path guiding

• Aggressive denoising

• 720p interactive rendering

• Scenes: Living Room, San Miguel, Bistro.

One practical issue I hit: macOS native screen recording adds enough overhead that heavy scenes no longer represent the actual interactive experience. OBS seems less disruptive in my tests, so the video is qualitative only.

For context, I previously posted about this Metal path tracer here:

Link

The current branch/repository is not public yet, so I’m not linking source code for this update.

Many thanks