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Fixed in 2021.3.16f1, 2022.2.0b15, 2023.1.0a13



Found in






Issue ID




Crash on EvaluateSlow when running particle system



How to reproduce:
# Open the user attached project
# Add the CRASH prefab to Hierarchy
# In Hierarchy select Canvas -> Button
# In the Inspector's Button Component, drag the child GameObject in the CRASH prefab into the OnClick event in the Button.
# Set the Button Function to test > Test (int)
# Enter Play Mode
# Click the Button
# The editor crashes

Reproducible with: 2020.3.36f1, 2021.3.6f1, 2022.1.8f1, 2022.2.0a19, 2023.1.0a2

Note: If the Button is not visible change the Aspect Ratio

Reproduced on: Windows 10 (Intel)

First lines of stack trace:
0x00007ff68ba294c2 (Unity) EvaluateSlow
0x00007ff68cb99e6d (Unity) UpdateOrbitalAndRadialTpl<4,0,0>
0x00007ff68cbab493 (Unity) VelocityModule::Update
0x00007ff68ba3b0d0 (Unity) ParticleSystem::UpdateModulesPreSimulationIncremental
0x00007ff68ba355c5 (Unity) ParticleSystem::StartModules

  1. Resolution Note (fix version 2023.1.0a13):

    The fix is to display an error and not crash.
    The setup is invalid - we don't support the XYZ curves using different modes (ie they must all be curves, or all floats, not a mixture)

    We handle this for all other modules that use XYZ curves, but had missed some error handling here.

    So you should update your code to use the same mode for all 3 orbital velocity curves.

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