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Votes
0
Found in
6000.0.60f1
6000.2.7f1
6000.3.0b6
6000.4.0a2
Issue ID
UUM-121677
Regression
No
Particle System with the custom Material breaks the Scene view when the material is using a Shader Graph with the Texture with the power of negative value
How to reproduce:
1. Open the attached project "BugRepro"
2. Open the "OutdoorScene" scene
3. In the Hierarchy, select the "Particle System" GameObject under the "Fireball"
4. Zoom in to the glowing orb and observe the results
Expected results: The Scene view doesn't become black or flicker
Actual results: The Scene view starts to flicker and becomes black
Reproducible with: 6000.0.60f1, 6000.2.7f1, 6000.3.0b6, 6000.4.0a2
Reproducible on: macOS Sequoia 15.6 (M1), Windows 11
Not reproducible on: No other environment tested
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Resolution Note:
Pow functions with negative exponents or bases are not necessarily portable across platforms and devices.
This is because many power operations on video cards are implemented as exp2(log2(B) * A). This does not support negative numbers in a predictable way. Different platforms will handle negative or zero cases differently.
While Shader Graph aims to be as portable as possible, there would be a performance penalty to hide this problem. Users can handle this case by preventing negative values to show up in content or by handling such cases within their graph as they see fit.