gluPerspective() vs glFrustum()

Graphics and GPU Programming Programming

Started by flodywan March 04, 2010 09:34 PM

1 comment, last by Brother Bob 14 years, 1 month ago

100

Author

March 04, 2010 09:34 PM

Is there an advantage one has over the other? From what I've read gluPerspective() makes the viewing window with an aspect ratio, whereas glFrustum() just defines the coordinates of the viewing window. Is that right? Which one do you use and why?

idinev

236

March 04, 2010 10:02 PM

gluPerspective() computes 4 floats, and calls glFrustum() with them.

Simply have a look at the maths:
http://www.opengl.org/sdk/docs/man/xhtml/gluPerspective.xml
http://www.opengl.org/sdk/docs/man/xhtml/glFrustum.xml

gluPerspective is preferred.

Brother Bob

10,350

March 05, 2010 01:54 AM

Quote:Original post by idinev
gluPerspective is preferred.

Except, of course, when glFrustum is preferred.

There are projection matrices that cannot be achieved with gluPerspective and the input they take are different, so which one is preferred depends on what you have and what you want to achieve.