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0
Found in [Package]
10.0.0-preview.26
Issue ID
1304150
Regression
Yes
[URP] Trails with URP/Particles Material become invisible when Enable Mesh GPU Instancing is checked in the Particle System
How to reproduce:
1. Open the user's attached "ParticleSystemTrail Bug.zip" project
2. Open the "SampleScene" Scene
3. Select the "Particle System" GameObject in the Hierarchy window
4. Enable the "Enable Mesh GPU Instancing" property in the Particle System's Renderer Module
5. Enter Play Mode
6. Observe the Game view
Expected result: Trails are visible in the Game view
Actual result: No Trails are visible in the Game view
Reproducible with: 10.0.0-preview.26 (2020.2.0b5), 10.2.2 (2020.2.2f1), 11.0.0 (2021.1.0b2, 2021.2.0a1)
Not reproducible with: 7.5.2 (2019.4.18f1), 8.3.1 (2020.1.17f1), 9.0.0-preview.72 (2020.2.0b5)
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Resolution Note:
We are unable to correctly handle using the same shader for both the main particles, and their trails, when using gpu mesh instancing. You'll need to use a different material for the trails.
To make this clearer, I'm adding an explanation in the Inspector when this happens.