Tracking target positions inside a deforming body

[bkoo]

Hi,

I’d like to track a few targets (just 3D positions) inside a deforming body.
What I tried was to add sphere meshes in certain positions in the body
and use MergeVisualModels to merge them with the body.
I thought that I could get the positions of these spheres later.
My code looks like this:

visualNode = body.createChild('visualNode')
bodyObjLoader = visualNode.createObject('MeshObjLoader', name='objLoader',
                                filename='body.obj')
visualNode.createObject('OglModel', src='@objLoader', name='VisualModel')

pointObjLoader = visualNode.createObject('MeshObjLoader', name='pointObjLoader',
                                                  filename='sphere.obj')
visualNode.createObject('OglModel', src='@pointObjLoader',
                                 translation='-81.463 -144.681 -790.974',
                                 name='pointVisualModel')
        
visualNode.createObject('MergeVisualModels', name='mergedVisualModel',
                                nb='2', input1='@VisualModel',
                                input2='@pointVisualModel')

visualNode.createObject('BarycentricMapping', name='visualMapping',
                                input='@../dofs', output='@VisualModel')

It didn’t work so I guess this is not the way to do it.
I suspect the mapping is causing a problem but am not sure.
Any suggestions on how to do this please?

Thanks a lot!

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