Particles that use source movement will start shooting out violently while in the cascade preview window. You need to have the movement option checked under the view settings. If you also check the bounds viewer (by clicking the bounds button at the top of the screen) you see the bounding box adapting in extreme ways while the system is in motion. During these "adjustments" the system will shoot out particles at high velocity.

This doesn't happen in the scene though.

Steps to Reproduce
  1. Open a blank project
  2. Add a particle system
  3. Add a source movement module
  4. In the preview window check "movement" under the view settings

The particle system will start circling the view and at certain points the particles will shoot out violently.

The particles circle the preview window in a manner consistent with source movement.

Have Comments or More Details?

Head over to the existing AnswerHub thread and let us know what's up.

Login to Vote

Won't Fix
ComponentUE - Rendering
Affects Versions4.
CreatedFeb 7, 2017
ResolvedAug 18, 2021
UpdatedAug 18, 2021