playcanvas / playcanvas/engine
SSAO + Alpha to Coverage breaks skybox on Firefox
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@mvaligursky is already working on this.
Since Mar 12, 2026.
area: graphics
- Dominant language
- JavaScript
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Description
When using CameraFrame.ssao (with type set to SSAOTYPE_LIGHTING) in a scene that has a material with Alpha to Coverage, the skybox stops working turning reflections and lighting black. If Type is set to SSAOTYPE_COMBINE, the entire screen turns black. This does not happen in Edge. SSAO on its own works, as does AtoC. It's the combination that breaks.
| Firefox, only SSAO | Firefox, SSAO+AtoC | Edge, SSAO+AtoC |
|---|---|---|
Example project:
https://playcanvas.com/project/1483591
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