gluPerspective Subroutine

OpenGL 1.1 for AIX: Reference Manual

gluPerspective Subroutine

Purpose

Sets up a perspective projection matrix.

Library

OpenGL C bindings library: libGL.a

C Syntax

void gluPerspective(GLdouble FieldOfViewY, 
   GLdouble AspectRatio, 
   GLdouble zNear, 
   GLdouble zFar)

Description

The gluPerspective subroutine specifies a viewing frustum into the world coordinate system. Generally, the AspectRatio used with this subroutine should match that of its associated viewport. For example, an aspect ratio value of AspectRatio=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 the gluPerspective subroutine is multiplied by the current matrix just as if the glMultMatrix subroutine 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 the glLoadIdentity subroutine.

Parameters

FieldOfViewY	Specifies the field of view angle (in degrees) in the y direction.
AspectRatio	Indicates the aspect ratio. This value determines the field of view in the x direction and is the ratio of x (width) to y (height).
zNear	Specifies the distance from the viewer to the closest clipping plane. This value must be positive.
zFar	Specifies the distance from the viewer to the farthest clipping plane. This value must be positive.

Files

/usr/include/GL/gl.h

Contains C language constraints, variable type definitions, and ANSI function prototypes for OpenGL.

Related Information

The glFrustum subroutine, glLoadIdentity subroutine, glMultMatrix subroutine, gluOrtho2D subroutine.

OpenGL Overview.