[vtkusers] How to do "glutSwapBuffers()" in a derived vtk class

[James Zhou]

Hi all,

I derived a vtk mapper class from vtkVolumeMapper based on a glut based
OpenGL sample program. I want to know how to do "glutSwapBuffers()；"
function in the "Render()" in vtk class? or we do not need do anything and
VTK already has done this in its background?

Thank you!

James
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