How to stop mesh disappearing during Animator state transition blend time?

Questions & Answers
1

I’m trying to make a transition with blend time between two states in Animator, but part of the model’s mesh disappears during the blend time. The image shows what happens.

11822-transition.jpg
11822-transition.jpg762×760 112 KB

The console shows these errors during the blend time:

transform.position assign attempt for 'root(Clone)' is not valid. Input position is { NaN, NaN, NaN }.
UnityEditor.DockArea:OnGUI()

transform.position assign attempt for 'PreRenderCamera' is not valid. Input position is { NaN, NaN, NaN }.
UnityEditor.DockArea:OnGUI()

The model has 2 geometries, one for the body and another for the members. It has modeled in ZBrush and rigged and animated in Softimage XSI. Because the FBX export from XSI is not working for me, I’m using .dae (Collada) export from Maya.

I have no idea of what is causing this problem. Help me, please. Thanks in advance.

2

I don’t know if you’re still wondering about this issue but I ran into a similar problem. I don’t get the error messages but do get most of the mesh disappearing during the transition.
It turned out to be an issue with negative scale on a bone in the skeleton, as talked about here.
(starts off about another problem but go down to where Wim Wouters starts talking)
Seems the fix isn’t in yet or isn’t enough of a fix, I’m on latest version of unity and still getting it. Reworking the skeleton to not have any negative scale bones was a bit of a pain but did fix the problem, so there’s at least one solution.