Tracking target positions inside a deforming body

[bkoo]

Hi,

I’d like to track the 3D positions of several targets inside a deforming body.
I tried putting sphere meshes inside the body by using MergeVisualModels
to combine the body and sphere meshes.
I thought I could get the positions of spheres later.
It didn’t work so I guess this is not the way to do it.
I suspect that my mapping is wrong but am not quite sure.
Any suggestions please?

(Somehow the post doesn’t show up if I add the code, so I can’t put the code here.)

Thanks!

[bkoo]

I hope the code will show up if I put it in the reply.

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')

[Hugo]

Dear @bkoo

First of all, I apologize for the delay of my reply. We have been busy with the SOFA Week. You can find out more about this annual community event on SofaFramework’s YouTube account.

I see the problem, but before giving a complete answer could you please explain what you want to do from the position of these points ? do you really need to visualize these tracked spheres?

Best,

Hugo

[Author]

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