Particles act erattic after rendering

[ReconEnforced]

I have fire particles in my animation that I use and seem to work greatly, and they seem fine during production. Then I start exporting the movie and when its done I look at the full movie and the fire parricles start up normal, reach there peak then start going nuts, spazzing, wiggling and just acting erattic and I dont know why or how to fix this issue. If someone could help that would be amazing!!

[Zappy]

Originally posted by ReconEnforced:

- the fire parricles start up normal, reach there peak then start going nuts, spazzing, wiggling and just acting erattic and I dont know why or how to fix this issue. -

Make sure that the shutter speed doesn't exceed [0.5 divided by the export frame rate]. You can set the shutter speed per-camera/-shot using the Element Viewer, or you can override it globally in the movie export settings.

At 24 frames per second, 0.5 / 24 = 0.020833333, which is the default shutter speed (even if you choose a different frame rate for your session). At 30 frames per second, it should be 0.0166666. At 60 frames per second, it should be 0.00833333.



If the shutter speed is more than [0.5 divided by the export frame rate], then the first sample of a frame is earlier in time than the last sample of the previous frame. This makes Source Filmmaker rewind time in order to process motion blur - and rewinding time resets particles. Hence, lowering the shutter speed can fix it.

(Similarly, when pausing in the Clip Editor with the scene (non-"work") camera active, it rewinds time slightly to preview motion blur, which is why that resets particles too.)