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Why do constraints not work on bones with no mesh in Physics Asset

I have run into what I think is a bug involving skeletal mesh physics assets:

  • I import a skeletal mesh which has the lower body and upper body connected through a spine bone.

  • This spine bone does not have any mesh associated with it.

  • When creating the physics asset it creates all the constraints I need.

  • Reviewing the constraints the chest is connected to the spine, which is connected to the pelvis.

  • However when I simulate this physics asset the mesh separates at the connection between the spine and chest.

  • If I go and manually add a collider to the spine body the chest and spine will no longer separate, however the constraint still ignores angular limits.

  • If I go back to the skeletal mesh and add some geometry to the spine bone and create a new physics asset the constraints now work as expected.

  • So in summary there appears to be something wrong with constraints without geometry. Is this intended?

Product Version: UE 4.9
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asked Sep 23 '15 at 12:32 AM in Using UE4

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avatar image Maim Games Aug 26 '16 at 09:58 PM

You didn't happen to find an answer to this did you?

avatar image Shyfty Aug 29 '16 at 10:43 PM

We ended up just putting a small cube in the hierarchy to work around the problem.

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