The particle system has its initial velocity and its velocity/life in world space. It is expected that the particle's orientation won't influence the particle's velocity. That isn't the case though as rotating the emitter clearly changes the direction of the particles. It isn't always consistent with each axis either. Meaning as you rotate the system the particle's direction don't seem to match at a 1:1 ratio.

Steps to Reproduce


  1. Open the attached project
  2. Select the particle system 'space'
  3. Enter 180 into the Y axis rotation


  1. open attached project
  2. Select the particle system in the scene and enter 90 into the Y axis rotation

The particles will shoot downward then begin to fly upwards.

The particles shoot upward and begin to fly downward.

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Won't Fix
ComponentUE - Graphics Features
Affects Versions4.
CreatedMar 17, 2017
ResolvedAug 18, 2021
UpdatedAug 18, 2021