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GluPerspective

lastmod 2024-11-17created 2024-11-148 edits

The gluPerspective function sets up a perspective projection matrix. It makes glFrustum easier to use.

Syntax 

void WINAPI gluPerspective(
   GLdouble fovy,
   GLdouble aspect,
   GLdouble zNear,
   GLdouble zFar
);

Parameters

fovy
The field of view angle, in degrees, in the y direction.
aspect
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
The distance from the viewer to the near clipping plane (always positive).
zFar
The distance from the viewer to the far clipping plane (always positive).

Description

The gluPerspective function specifies a viewing frustum into the world coordinate system. Generally, 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 multiplied by the current matrix, just as if glMultMatrix were called with the generated matrix. To load the cube view matrix onto the current matrix stack instead, precede the call to gluPerspective with a call to glLoadIdentity.

See also

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