glFustrum

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Started by djdynamic November 19, 2002 01:45 AM

4 comments, last by djdynamic 22 years, 3 months ago

djdynamic

Author

122

November 19, 2002 01:45 AM

Anyone know how to use glFustrum as opposed to having to use gluPerspective. Thanks.

tylerbingham

122

November 19, 2002 02:56 AM

glFrustum(GLdouble left,GLdouble right,GLdouble bottom,GLdouble top,GLdouble near, GLdouble far)

gluPerspective(GLdouble fov, GLdouble aspect, GLdouble near, GLdouble far)

the difference is that with glPerspective you are defining the angle in Y that is visible, aspect is the width/height.glFrustum lets you specify asymetrical frustum(not good). I would not use frustum.

djdynamic

Author

122

November 19, 2002 03:11 AM

Well I just want to achieve the same result as gluPerspective without having to use GLU.... (just GL), and i''ve been playing with glFustrum, but doesnt seem to be working how I want it :/ Any other ways?

Null and Void

1,088

November 19, 2002 07:27 AM

  void my_gluPerspective(double FOV, double Aspect, double Near, double Far) {	double YMax = Near * tan(FOV * 0.5 * 0.01745329251994329);	double YMin = -YMax;	double XMin = YMin * Aspect;	double XMax = YMax * Aspect;	glFrustum(XMin,XMax,YMin,YMax,Near,Far);}