RTR StackLit clearcoat approximation base layer lighting hierarchy issue

Unity Engine
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1

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

800×395 74 KB

Lights off

800×395 12.2 KB

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

Thanks,
m0nsky

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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,

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Also don’t forget to post the fogbug here or It is gonna take a bit of time to get to me!

4

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.

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