NVIDIAGameWorks / NVIDIAGameWorks/rtx-remix

[Runtime Bug]: NRC causes the dark scene to be lit up for a few seconds when entering from a bright scene

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Description

Describe the bug

A bug happened where when having NRC enabled, for some reason transitioning from a bright to dark scene (eg, going inside a dark room from a bright outside) causes the room to be lit up for a few seconds before fating back into darkness, the bug becomes less apparent when going up in quality levels

How do you reproduce the bug?

The easiest way i found of consistently recreating this bug was playing gmod-rtx and running the "Backrooms - Level 4" (enabled the medium setting to make the effect more apparent), if required ill find other means of recreating this beyond gmod-rtx

https://github.com/user-attachments/assets/9b1c932d-722f-4590-b66a-d9c6b92125f2

Mod link: https://github.com/Xenthio/garrys-mod-rtx-remixed

Map link: https://steamcommunity.com/sharedfiles/filedetails/?id=3014213790

What is the expected behavior?

The runtime should have it so that with NRC dark rooms always stay dark and not be affected by whatever information you had in a prior scene beyond the accurate path tracing, much like importance sampled which the noisiest but most accurate indirect lighting method

Version

The gmod-rtx runtime being used is based on dxvk-remix commit 6d75248

Logs

remix-dxvk.log

nrc_session_log.txt

Crash dumps

No response

Media

No response

Contributor guide

No contributing guide indexed for this repository

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the transition in gmod-rtx using the Backrooms - Level 4 map with NRC enabled, then review remix-dxvk.log and nrc_session_log.txt. Compare the NRC behavior when entering a dark scene from a bright scene with the importance-sampled mode. Done means the dark room does not remain temporarily lit by information from the prior scene.

Written by the indexing model from the issue text.

Assessment

Domain
computer-graphics
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
38/100

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