Using Collision without Update Age will prevent any particles from spawning. In Collision Query and Response DataInstance.Alive has a default value of false. If no other module sets DataInstance.Alive to true, this default value will be used, and cause all particles to be killed immediately.
WORKAROUND:
Set DataInstance.Alive to true directly in the stack.
RESULT:
The emitter no longer has any particles. Re-enabling Update Age will start spawning particles again.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-88914 in the post.
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Component | UE - Niagara |
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Affects Versions | 4.24 |
Target Fix | 4.25 |
Created | Feb 17, 2020 |
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Resolved | Mar 20, 2020 |
Updated | Aug 31, 2020 |