When spawning GPUCompute Sim Niagara system which is consist of opaque particle emitter and translucent one, if those emitters use Collision module, opaque particle often appears one frame later than a translucent one.
Here's an animated GIF. (Note: This movie is made by special way to highlight the issue, recording the screen and editing as frame-by-frame playback video.) [Image Removed]
If it's CPU Sim or without Collision module, this issue does not occur, meaning all particles appears at the same frame.
[Image Removed]
This bug occurs in a split second, so it's recommended to record with OBS studio (with the recording rate set to 60fps) and check it by frame-by-frame playback.
Limiting max fps (e.g. t.MaxFPS 10) can help to watch this visual issue.
The repro project is available on the attachment. LV_WithCollision spawns Niagara VFX which has those two emitters with Collision module. LV_WithoutCollision spawns the exactly same Niagara VFX except for Collision module. Also, the frame-by-frame playback GIF animations are attached.
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-211146 in the post.
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Component | UE - Niagara - Rendering |
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Affects Versions | 5.4.1 |
Created | Apr 2, 2024 |
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Updated | Feb 3, 2025 |