View Full Version : glOrtho vs. glFrustrum
Even though I own the "Red Book" and have read the description of the two thoroughly, I still have trouble deciding which to use for which circumstances.
Can anyone help me out?
10-29-2000, 03:19 PM
Ortho creates a parallel projection - IE one with NO perspective effects. Thats useful for CAD, undistorted views of elevations, that kinda thing.
Frustrum creates, err, a frustrum - like a pyramid on its side with the end chopped off. That's what you'd use when you wanted a perspective effect.
gluPerspective wraps up glFrustrum nicely...
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