[Bug] Particles: collision response "Stop" doesn't stops acceleration

Development Asset Creation FX
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1

To reproduce this bug, create a particle system with a GPU emitter. Add the node Collision (Scene Depth) with collision response set to Stop, and a Const Acceleration node with an acceleration of (0, 0, -2000).

Notice how the particles keep trying to go below the ground after they collide with the ground. Also, since particle collisions aren’t calculated when you’re not looking at them, the particles fall below the ground and keep accelerating down (even if they were supposed to “Stop”), so they effectively “disappear” from the ground.

The collision response “Stop” should stop all acceleration and velocity, right? (apparently it does stops velocity, just not acceleration)

Also, is there a way to force GPU particle collisions even when the camera is not facing them?

2

Ehh, probably no way to collide when not looking, after all it depends on “scene depth”. I’ll switch to CPU particles.

3

Hi Jefferson,

Thank you for your patience. Essentially it is a bounds issue; The editor does not render particle systems that are not in view bounds. You can go into the details of the particle in the level and set the Bounds Scale up so that it does not cull the particles too early. You may have to play with it until it renders the way you want. I hope that this has helped you!

Cheers!

Alexander