Photon OVRTX
Overview
The Photon front end on the ovrtx backend — same scene semantics, tuned for interactive previz.
Photon OVRTX is the second Photon renderer. Same operators, same materials, same lights — a different engine underneath. Where RTXPT converges to a reference-grade frame, OVRTX holds a stable interactive image under constant scene churn.
Scenes are portable between the two Photons. The operator surface is shared, so switching engines is replacing one TOP — bindings, lights, and cameras carry over untouched.
When to reach for OVRTX
| You are doing | Use |
|---|---|
| Previz with a director dragging lights around | OVRTX |
| Look development toward a final still | RTXPT |
| Live show output at frame rate | OVRTX |
| Fixture-accurate lighting sign-off | RTXPT |
What differs from RTXPT
- Radiance caching — indirect light amortizes across frames; a moving camera doesn't restart the world
- Fixed frame budget — set milliseconds, not samples; quality scales to fit the frame time you have left
- No accumulation state — every frame is complete, so downstream feedback loops behave
The trade: OVRTX's indirect lighting is approximate. Caustics, deep glass, and long light chains resolve on RTXPT only.