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Fixed in 2021.2.X



Found in

Issue ID




[GPULM] - Fallback to CPULM failing on reading totalRaysCastCountBuffer

Progressive Lightmapper


Baking with GPULM sometimes fails while reading totalRaysCastCountBuffer used to measure baking performance.
This happens in RRBakeLightProbesTechnique::Render().

Step to repro:
*Fetch the HDRP graphics repo at sha 196f36cf8498b9099363808ddcf3138d2dab379f
*Download the repro project at
*Update the manifest.json in SponzaHDRP/Packages to point to your local HDRP repo
*Set EnableProbeVolumes = 1, in Runtime/ShaderConfig.cs
*Try baking lighting with it
If bug does not happen on first bake, try clearing baked data and baking again several times.

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