gluPerspective man page on Darwin

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GLUPERSPECTIVE(3G)					    GLUPERSPECTIVE(3G)

NAME
       gluPerspective - set up a perspective projection matrix

C SPECIFICATION
       void gluPerspective( GLdouble fovy,
			    GLdouble aspect,
			    GLdouble zNear,
			    GLdouble zFar )

PARAMETERS
       fovy    Specifies  the field of view angle, in degrees, in the y direc‐
	       tion.

       aspect  Specifies the aspect ratio that determines the field of view in
	       the x direction.	 The aspect ratio is the ratio of x (width) to
	       y (height).

       zNear   Specifies the distance from the viewer  to  the	near  clipping
	       plane (always positive).

       zFar    Specifies  the  distance	 from  the  viewer to the far clipping
	       plane (always positive).

DESCRIPTION
       gluPerspective specifies a viewing frustum into	the  world  coordinate
       system.	 In  general,  the aspect ratio in gluPerspective should match
       the aspect ratio of the associated viewport. For example, aspect =  2.0
       means  the  viewer's angle of view is twice as wide in x as it is in y.
       If the viewport is twice as wide as it is tall, it displays  the	 image
       without distortion.

       The  matrix  generated  by  gluPerspective  is multipled by the current
       matrix, just as if glMultMatrix were called with the generated  matrix.
       To  load	 the perspective matrix onto the current matrix stack instead,
       precede the call to gluPerspective with a call to glLoadIdentity.

       Given f defined as follows:

			       f  = cotangent(fovy/2)

       The generated matrix is
	     f
	------------	   0		  0		 0
	   aspect

	    0		   f		  0		 0

				      zFar+zNear    2*zFar*zNear
	    0		   0	      ----------    ------------
				      zNear-zFar     zNear-zFar

	    0		   0		  -1		 0

NOTES
       Depth buffer precision is affected by the values	 specified  for	 zNear
       and  zFar.   The greater the ratio of zFar to zNear is, the less effec‐
       tive the depth buffer will be at distinguishing between	surfaces  that
       are near each other.  If

				   r = zFar/zNear

       roughly	log2(r)	 bits  of  depth buffer precision are lost.  Because r
       approaches infinity as zNear approaches 0, zNear must never be  set  to
       0.

SEE ALSO
       glFrustum, glLoadIdentity, glMultMatrix, gluOrtho2D

							    GLUPERSPECTIVE(3G)
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