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High-speed object bouncing for no reason

I have a sphere that gets hit by another object and then rolls along the surface of a perfectly flat BSP box. At very high speeds the sphere will occasionally bounce up into the air for no apparent reason after travelling a variable difference.

Is there any easy way to prevent this from happening?

Product Version: UE 4.9
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asked Sep 29 '15 at 12:45 AM in Using UE4

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Have you tried enabling CCD on the object? - this is designed to ensure high speed interactions work correctly.

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answered Sep 29 '15 at 12:36 PM

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avatar image BenWeber Sep 29 '15 at 06:10 PM

Yep, CCD is on, also substepping.

avatar image MrGrr Oct 04 '15 at 10:32 AM

heres a thought... did you Create the sphere model? if so, did you import collision? (this could be where it goes bad, as the Poly edges on the model are sharp corners/edges, and not a smooth surface) if you imported collision - disable collision on your model and adde a standard sphere collision component see if that makes a difference.

All of the above is assuming you made and imported your own sphere model though. Imagine a sphere made out of polygons the edges could cause the effect you see.

avatar image BenWeber Oct 04 '15 at 06:01 PM

Unfortunately, it's already using UE4's sphere collision.

avatar image MrGrr Oct 05 '15 at 09:26 AM

Hmm. collision on the mesh disabled? if it is, is the floor 100% perfectly flat? it's not something like the other object hitting it on a slightly angle causing the bounce? (Just like you can "bounce" snooker/pool balls if hit in the right spot)

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