Description

Sprites in a particle system flicker/shake when use local space is combined with small velocity values and velocity aligned sprites.

Reported and tested in versions 4.25.3(CL 13942748), 4.24.3(CL 11590370), and 4.23.1(CL 9631420). In version 4.25.3 particles appear to be stable on X and Y axis, however will flicker when transform is changed to higher values on Z axis. 

Steps to Reproduce
  1. Create Cascade particle system.
  2. Check "Use local space"
  3. Set screen alignment to PSA Velocity.
  4. Set initial velocity to 0, 0, 5 or similar small values.
  5. Move particle system somewhere very far away from the origin, set the position values along any axis to 100,000 or higher (higher values produce stronger jittering)

Result: Particle sprite will start jittering and shaking.

Expected: Smooth movement, exactly like it behaves at the origin.

Have Comments or More Details?

There's no existing public thread on this issue, so head over to AnswerHub just mention UE-98086 in the post.

1
Login to Vote

Backlogged
ComponentRendering - Cascade
Affects Versions4.23.14.21.24.22.34.24.34.25.3
CreatedSep 2, 2020
UpdatedSep 3, 2020