[vtkusers] Are there any functions which similar to gluUnproject() in OpenGL?

[AddOil]

Dear all,

Are there any functions in VTK which similar to gluUnproject() in OpenGL?

My input are 2D window coordinates and a z value. I want to know the point's
coordinates in 3D space. What should I do?

Thanks a lot!

Regards,
AddOil
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