[vtkusers] VTK actors only appear after camera zoom action by user

[BBerco]

Dear all, 
I am dealing with an annoying delay in the rendering process. Basically, a
shape model stored in a vtkPolyData and displayed inside a QVTKWidget
through the usual mapper/actor chain only shows after a zoom in/out action.

I was thinking that calling
*this -> qvtkWidget -> GetRenderWindow() -> Render();*

after adding the actor to the current renderer was sufficient, but it seems
I missed something.

Any thoughts?

Best, 
Ben




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