Unity 2022.2.13 HDRP DXR Path Tracing using Unity Recorder with frame accumulation.
After about 150 accumulated samples, a grid of white dots starts to appear and gradually becomes more prominent. They also appear in the final movie.
If I disable volumetric fog, the artefacts disappear.
Did anyone else experience this?
Bug reported: IN-38013.
If you disable Volumetric Fog or HDRI Sky in the Volume, then the white dots are gone. Also, if you don’t use a HdriSky texture the white dots are gone. My best guess is this has something to do with sampling the hdri texture in the volumetric fog code. Judging on the grid layout, perhaps it is also related to tiled rendering.
Bug confirmed and active.
“Fixed in: 2023.2.0a7”
Since it’s a confirmed bug, hopefully that means it will be backported to 2022.2 also
