body motion joint position incorrect

Hi everyone,


I am a new developer for xcode.


I was download the capturing body motion sample code.


https://developer.apple.com/documentation/arkit/capturing_body_motion_in_3d


When I using build a 3d model and replace the default model (robot.usdz), Some part of joint would become bending or become incorrect location.


for example:

The leg are normal to move and control, but the spine would rotation 90 degrees to backward.


However, When I chcek the model with "blender", the model is correct.


Have anything I need to edit or add on the sample code (such as viewcontroller)?

I also have the same problem

body motion joint position incorrect
 
 
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