How do I retrieve, or set the visible coordinate system of a perspective volume?
I know how to map the x,y on an ortho volume to the window’s x,y, but is there a way to do this for perspective volumes?
Hmm, is it just me or do I seem vague here?
What I’m trying to do is find out what the ratio is between 1.0 units in the x or y direction on a given plane x,y along the z axis in relation to the window coordinates.
ie: the right-most edge of the window is, say, 400 pixels. I want to know what that is in volume units 200 units back into the viewing volume. I know it will be much bigger than 400.
Thanks in advance!