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[Runtime Bug]: Neural Radiance Cache seems not to maintain it's indirect lighting information.

Open Safemilk opened this issue 9 months ago • 10 comments

Describe the bug

The Neural Radiance Cache seems to dump it's indirect lighting information after a few seconds, or after looking away from a portion of the scene, it never comes back.

How do you reproduce the bug?

  1. Go into an area in a live remix environment.
  2. Turn on ReStir, note the lighting environment.
  3. Switch to the Neural Radiance Cache
  4. Look away from the scene, then back.
  5. Note the darker lighting
  6. Turn ReStir back on, and note the indirect lighting return.

What is the expected behavior?

The NRC should produce similar results as the ReStir approach and maintain, them during play.

Version

1.0.0

Logs

No response

Crash dumps

No response

Media

ReStir Image

Neural Radiance Cache after first switching Image

Neural Radiance Cache after looking away then back Image

Safemilk avatar Mar 17 '25 01:03 Safemilk

I think NRC combined with anti culling enabled breaks it.

JElfferich avatar Mar 18 '25 15:03 JElfferich

@JElfferich Interesting, I'll try and confirm that!

Safemilk avatar Mar 18 '25 21:03 Safemilk

Yes, that would be good to double check, that the geometry is not getting culled away after looking away. Otherwise it's expected to happen over some period of time.

pkristof avatar Mar 20 '25 17:03 pkristof

@pkristof Confirmed that anti culling being ON breaks the NRC functionality, the indirect lighting flushes and never returns. Switching Anti Culling OFF seems to help NRC maintain and properly render indirect lighting.

ReStir does not suffer from these issues and works with Anti Culling and without Anti Culling. This is definitely a bug with NRC + Anti Culling.

Safemilk avatar Mar 22 '25 16:03 Safemilk

Can you re-try with the latest release 1.2.4?

If it still reproes: Can you share a video showing the behavior with AC ON and OFF for both NRC and ReSTIR GI? Showing your findings What are the repro instructions for your exact scenario? Which game, share rtx.conf/setup instructions, etc.

Internal ticket: REMIX-4622

pkristof avatar Sep 22 '25 17:09 pkristof

@pkristof Hey! Let me give it a shot as soon as I can, I'll report back with repro etc.

Safemilk avatar Sep 25 '25 22:09 Safemilk

Hi @Safemilk - have you been able to try reproducing this on 1.2.4 yet? If so, let us know if you're seeing the correct behavior. Thanks!

NV-LL avatar Oct 13 '25 20:10 NV-LL

@NV-LL Hey sorry I have been on the other side of the world for work, so I'm away from my rig with my project setup. Should be home tomorrow (after a 16 hour flight D:) , so I'll check it out ASAP and report back, most likely early Friday.

Safemilk avatar Oct 15 '25 14:10 Safemilk

@NV-LL Back home!

Unfortunately I'm seeing the same behavior in 1.2.4 Is there a specific sub version of 1.2.4 I should be looking at it with?

Image

Safemilk avatar Oct 23 '25 18:10 Safemilk

Can you share a video showing the behavior with AC ON and OFF for both NRC and ReSTIR GI? Showing your findings What are the repro instructions for your exact scenario? Which game, share rtx.conf/setup instructions, etc.

It would be good to get a video of the behavior as well as actual repro instructions as per above.

pkristof avatar Oct 27 '25 17:10 pkristof