Overview
Real-time path tracing inside TouchDesigner, built on NVIDIA's RTX Path Tracing SDK.
Photon RTXPT is a path tracer that lives in your network. Geometry comes in as SOPs or USD, lights and cameras are COMPs you already know, and the render lands in a TOP — denoised, tone-mapped, and ready for compositing.
Photon RTXPT requires an RTX GPU (20-series or newer) — the path tracer runs on RT cores. See Requirements.
How it renders
A frame is a cook. Every time the operator cooks it traces a configurable number of paths per pixel, accumulates against the previous frames when the scene is static, and runs the DLSS Ray Reconstruction denoiser before output. Move the camera and accumulation resets automatically.
Scene translation
SOP and USD inputs become RTX acceleration structures incrementally — only what changed re-uploads, so animated geometry stays interactive.
Physically based by default
Materials, lights, and camera exposure follow the same physical units as offline renderers — lumens, EV, and metric scene scale.
What's in the box
- One render TOP with the full parameter surface — operators has the map
- Principled, emission, and glass materials
- Area, sun, dome, and mesh lights
- A parameter reference generated from the same source that registers them in TouchDesigner