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By Design
Votes
0
Found in
2021.3.46f1
2022.3.54f1
6000.0.30f1
6000.1.0a7
Issue ID
UUM-90481
Regression
No
Volumetrics break when using a Custom Pass to create a Thickness Buffer for Alpha Clipping
Reproduction steps:
1. Open the attached “Pressure.zip” project
2. Open the “OutdoorsScene”
3. Observe the Game view
4. Move the “Main Camera” inside the boundaries of the “Capsule” GameObject (around (-2;-1;9))
5. Observe the Game view
Expected result: The Volumetric Fog effect is visible in the Game view, like in 3rd step
Actual result: The Volumetric Fog effect is not visible in the Game view
Reproducible with: 2021.3.46f1, 2022.3.54f1, 6000.0.30f1, 6000.1.0a7
Reproducible on: Windows 11
Not reproducible on: no other environment tested
Note:
- Reproduces when ‘Injection Point’ is ‘Before Rendering’ or ‘After Opaque Depth And Normal’
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Resolution Note:
Your "WaterSurface" shadergraph is screen-space sampling your _ExcluderDepthNear and _ExcluderDepthFar for all shader passes (opaque, depth, shadow-caster, etc.), which is causing non-camera-aligned passes to discard pixels incorrectly.
In your case, the "ShadowCaster" pass is sampling these camera-aligned textures and discarding shadow-map pixels incorrectly in `_ShadowmapCascadeAtlas` (used to later compute volumetric lighting), leading to its corruption and rendering artifacts (position the camera inside the capsule, open the `FrameDebugger` and observe the contents of your shadowmap at the end of the `RenderShadowMaps` section).
You have two possible workarounds here:
- If you're ok with the clipped-area not affecting the shadows/god-rays, you can add a custom HLSL block to your shadergraph, where you disable this near/far test when `SHADERPASS == SHADERPASS_SHADOWS`.
- If you want to affect the shadows/god-rays, you need near/far textures per-view (each camera, shadow-casting light, etc.) and sample the correct one based on which view you're rendering. This will increase the effect complexity significantly, but it's the only way to represent that volume-cutout correctly for all passes.