[vtkusers] how to draw with exact physical dimension (on screen)

[Elvis Chen]

hi all,

Is there a way to draw a geometrical objects that will show up on the
screen with known physical dimension in vtk?

That is, say if I want to draw a square of 5cm in dimension, and I want it
to appear on screen as a square of 5cm^2, how do I specify vtkCamera that
takes the screen pixel dimension into consideration?

or am I in the wrong track by looking into vtkCamera?

any help is very much appreciated,
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