[vtkusers] Where is the math behind world to display coordinates and vice versa, implemented in vtk?

[vinmean]

I want to recreate the transformation from display to world and world to
display coordinate system.  Where is the math behind coordinate conversion
implemented? I am unable to trace it from the viewport class that provides
the member function WorldToDisplay and DisplayToWorld.

	renderer->SetWorldPoint(wrld_cord);
	renderer->WorldToDisplay();
	renderer->GetDisplayPoint(scr_cord);

Please point me to the math either in the code or in some tutorials.



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