Description

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.

Steps to Reproduce
  1. Create a new Niagara System based off the the Fountain template
  2. Add a Collision module to the Particle Update
  3. Disable the Update Age module

RESULT:
The emitter no longer has any particles. Re-enabling Update Age will start spawning particles again.

Have Comments or More Details?

There's no existing public thread on this issue, so head over toAnswerHub just mention UE-88914 in the post.

0
Login to Vote

Fixed
ComponentRendering - Niagara
Affects Versions4.24
Target Fix4.25
Fix Commit12350700
Release Commit12345953
CreatedFeb 17, 2020
ResolvedMar 20, 2020
UpdatedMar 23, 2020