NvRTX Caustics 5.7: Substrate!

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Hi there,

Absolutely amazing to see that behind the curtains the NVIDIA team is still working on the NvRTX Caustics branch. The new version based on 5.7.4 works perfectly and even has (partial) support for Substrate. A very, very welcome development.

In the hope that this comment makes it to the developers (looking at you @MarcusHoho ;-)), here are two points of feedback:

  1. Switching the view mode to Path Tracing now instantly crashes the engine
  2. It seems to me that Lumen Reflections only work if ‘Ray Lighting Mode’ is set to ‘Surface Cache’ (in Lumen Global Illumination). With ‘Ray Lighting Mode’ set to ‘Hit Lighting for Reflections’, all I get is skylight or HDRI backdrop reflections.

Not sure if these are known issues, but there we are..

Anyway, thanks and keep up the great work.

Cheers,

VTY

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Hi there,

One additional point of feedback, playing with Substrate on Caustics 5.7: It seems Lumen reflections are not working at all, if Hit Lighting (for reflections) is enabled, while screenspace reflections are working ok. See also this screenshot from the Glassworks_5.7 demo:

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@MarkusHoHo Any chance you can pass this on to the devs?

VTY

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Another sidenote: Tested the same on the ‘regular’ (non-caustics) NvRTX-5.7.4 and there reflections work as expected. So the issue is specific to the Caustics branch.

Hope that helps.

VTY