[vtkusers] vtkInteractorStyleTrackballActor

[Maarten Beek]

Hi all,

vtkInteractorStyleTrackballActor is working fine, but as soon as I transform the actor using:

    vtkTransform* usertransform = vtkTransform::SafeDownCast(m_pModel->GetUserTransform());
    vtkSmartPointer<vtkTransform> transform = vtkSmartPointer<vtkTransform>::New();
    transform->Translate(0.0, 0.0, -0.5);
    transform->Scale(1/scale, 1/scale, 1/scale);
    transform->Translate(-center[0], -center[1], -center[2]);

    usertransform->PostMultiply();
    usertransform->Concatenate(transform);


I cannot move the actor anymore.
I checked with the debugger and I seem to get a non-NULL for the this->InteractionProp variable (so I think I do pick the actor).

I also noticed that in vtkInteractorStyleTrackballActor::Prop3DTransform() there is a line that I don't really understand:

newTransform->GetMatrix(prop3D->GetUserMatrix());    (note: twice GET!)

Any suggestions?

Thanks - Maarten
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