在QVTKRenderWindowInteractor中使用vtkOrientationMarkerWidget [PyQt4 / PySide]

Question

I working on a PySide/vtk GUI using QVTKRenderWindowInteractor widget class. The widget is working well, unless when I try to add a orientation axis (see image) using vtkOrientationMarkerWidget :

axesActor = vtk.vtkAxesActor();
axes = vtk.vtkOrientationMarkerWidget()
axes.SetOrientationMarker(axesActor)
axes.SetInteractor(self.iren)
self.ren.AddActor(axesActor)
axes.EnabledOn() # <== application freeze-crash
axes.InteractiveOn()

A similar bug has been already reported for ubuntu , showing that the bug is reproduced only with Qt example , while the same example without Qt works well.

Any solution to this behavior ?

Answer 1

Got this answer from Nicholas R. Rypkema :

https://nrr.mit.edu/blog/note-about-vtk-pyqt-and-vtkorientationmarkerwidget

Long story short : this will fix your problem

axesActor = vtk.vtkAxesActor();
self.axes = vtk.vtkOrientationMarkerWidget()
self.axes.SetOrientationMarker(axesActor)
self.axes.SetInteractor(self.iren)
self.ren.AddActor(axesActor)
self.axes.EnabledOn() # <== application freeze-crash
self.axes.InteractiveOn()