TSL: Add blurred mipmaps and honor roughness for ssr().
#31649
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Mugen87
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This was referenced Aug 23, 2025
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Related issue: #31576, #28752
Description
The PR adds support for blurred SSR reflections by generating a mipmap chain of blurred versions of the reflection buffer. A mip is selected based on the fragment's roughness value. I'm currently using the same number of mips like the Unity SSR mentioned in #31576. Rough materials looks now considerably better when using SSR 🚀 .
Using blurred mipmaps is optional and adds additional overhead to the SSR. In a performance stress test with a 5K resolution the performance went down from 52 FPS to 43 FPS. That is not substantial but still worth having in mind when using this technique. When using blurred SSR reflections with very rough surfaces, it's possible to reduce the
qualitya bit (e.g. from0.5to0.3) which compensates the performance lost.