Physical Animation Component Crash while the component is ticking

Development Character & Animation
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This question was created in reference to: [Crash when applying physical animation [Content removed] and [Crash when spawning actor with physical animator component at [Content removed]

Hello all!

We have been experiencing a similar, if not the same, crash with the PhysicalAnimationComponentwhile it is ticking. It usually reproduces more frequently with “-stompmalloc” enabled, while we apply an impulse to a bone on the SkeletalMeshComponent. Note that the poor performance with the previously mentioned setup appears to increase the likelihood of this crash occurring. Additionally, I have found that the tick function will more often than not crash in the TG_EndPhysics or TG_PostPhysicstick groups. Furthermore, it’s puzzling that the PhysicalAnimationComponent ticked in the PostPhysics/EndPhysicsas the TickGroup and EndTickGroup are set to TG_PrePhysics. I’m not entirely sure why this component’s tick group would be demoted so far into those groups, as the SkeletalMeshComponent (prerequisite tick function)is set to tick within the TG_PrePhysics as well.

We have implemented the temporary fix of disabling a.ParalleBlendPhysics within the DefaultEngine.ini;however, I was wondering if there is a more proper fix to allow a.ParalleBlendPhysics to remain enabled.

Thank you for reading,

Rozario Beaudin

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Steps to Reproduce
Utilize “-stompmalloc” in the launch args, and apply a force on one of the physics bodies in the skeletal mesh component while they have a PhysicsBlendWeight > 0. Usually more likely to be reproed if the performance is bad.

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Hi Rozario,

Thank you for raising this - I’ll reach out to the dev team to see if this fix was done, and update here.

Best

Geoff Stacey

Developer Relations

EPIC Games

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Hi Rozario,

This has not been fixed I’m afraid. Our current advice is to use what you’ve done to work around the issue.

Best

Geoff