[BUG] Particles present in editor preview, are missing in game

The unsharp circle is intended, but the missing particles on the second picture seems to be a strange bug, since they do show up when I play the sequence in matinee, just when I render it as a movie or hit the play button, parts of the particles disappear. I set the clipping plane to 1 in the config of the editor.

HI The_Distiller -

Thank you for your report. I will begin investigation into this issue as soon as possible. I wanted to begin by asking a few important questions to ensure that I can reproduce this bug effectively.

Can you give a detailed description of your particle system? (For example: Was it a GPU system and if so how many modules and emitters are you using? Are there vector fields involved?)

How is the emitter / emitters being activated or spawned in the level?

As always, please be sure to review our suggestions for how to report a bug, and feel free to edit your post if you have additional information to provide:

Thank you.

Eric Ketchum

Sorry for my scarce description. Here are more details:

I use the 4.2.1 release with Win 7 and a 680GTX.

One thing that I noticed, when I capture the movie from around frame 110 instead of frame 0, the particles show. The emitter is simply placed in the level and triggered via matinee.

I adjusted the camera to follow the mesh and now the particles are being emitted all the way, could it be the case that during “gameplay” some kind of culling gets applied and the mesh is gone while not in camera, hence no particle emission?

Hi The_Distiller -

Yes this is probably what was happening. Specifically if you had a camera group blending to the Particle target then it may have zoomed to close and the engine is culling out the mesh component which generates the particles as being rendered behind or to far to the periphery of the camera.

Is it possible to completely disable culling for skeletal meshes?

No but the culling should be controlled by the Skeletal mesh’s physics assets. so you can try to increase the size of the capsule in the PHat editor. Also I am sure you have done this already but have you set the bounds for your particle system.

Thank You

Eric Ketchum

OK, I’ll try that and yes I already set the bounds, thanks!