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Bug RTR StackLit clearcoat approximation base layer lighting hierarchy issue

Discussion in 'HDRP Ray Tracing' started by m0nsky, Dec 11, 2021.

  1. m0nsky

    m0nsky

    Joined:
    Dec 9, 2015
    Posts:
    263
    The current RTR StackLit clearcoat approximation seems to use the Sky instead of Reflection Probe for the base layer lighting hierarchy, which results in bright materials in the dark.

    What I've tried
    - Lighting & reflection probes baked with the lights disabled
    - Switching the ambient mode from static to dynamic did not make a difference
    - Increasing the light cluster range did not make a difference
    - Switching RTR fallback hierarchy settings did not make a difference
    - Switching between RTR performance/quality did not make a difference
    - Increasing RTR bounces from 1 to 2 did not make a difference
    - Disabling "Dual Specular Lobe" did not make a difference
    - Disabling "Coat" on the material looks correct, as expected
    - Increasing the HDRI Sky exposure, makes the problem worse

    Further testing
    Recently, PR #6107 and #6103 by slunity changed the behavior of StackLit clearcoat + RTR. To make sure this is not a newly introduced regression, I checked out on commit df37bc5415b3deee5c6bacaf6ecf2dc2077c69e0 (November 22) before those PRs were merged, and the issue was already present there.

    Extra information
    The material used is CarPaint_DarkRed from the Measured Materials Library.

    Example

    Lights on



    Lights off



    I can submit an official bug report through fogbugz if needed.

    Thanks,
    m0nsky
     
    Last edited: Dec 12, 2021
    chap-unity likes this.
  2. auzaiffe

    auzaiffe

    Unity Technologies

    Joined:
    Sep 4, 2018
    Posts:
    255
    Hey,

    Thanks for finding this!

    A fogbugz would be awesome, makes the repro-time easier and we can focus on fixing and ensuring everything will be good for you,

    Best,
     
    m0nsky likes this.
  3. auzaiffe

    auzaiffe

    Unity Technologies

    Joined:
    Sep 4, 2018
    Posts:
    255
    Also don't forget to post the fogbug here or It is gonna take a bit of time to get to me!
     
  4. m0nsky

    m0nsky

    Joined:
    Dec 9, 2015
    Posts:
    263
    I created a new 2022.1 project for the bug report and noticed the issue wasn't present there, so I went back to investigating a little more. (issue is present in an older project)

    I recreated the lighting settings, HDRP asset and global settings in that project and wasn't able to reproduce it anymore. I think this can be closed for now as it doesn't seem to be related to the package/shaders.
     
    keeponshading, Lex4art and auzaiffe like this.