How to use python vtk to get the stereo effect? -

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i got vtk working rendering 3d objects. want render in stereo way. cannot figure out how tried 

ren.resetcamera() window = vtk.vtkrenderwindow() #window.getstereocapablewindow()  #window.stereocapablewindowon()  window.addrenderer(ren) window.setstereorender(1)

but doesn't work. body can give idea?

this piece of code guarantee work

window = vtk.vtkrenderwindow() window.getstereocapablewindow()  window.stereocapablewindowon()  window.addrenderer(ren) window.setstereorender(1) window.setstereotypetointerlaced()

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