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Nintendo® Confidential

## guPerspective

Syntax

    #include "gu.h"
    void guPerspective(Mtx m,
       u16 *perspNorm,
       float fovy, float aspect,
       float near, float far, float scale)

Arguments

- m is the resulting 4x4 projection matrix

- perspNorm is the pointer to the value to use with the gSPPerspNormalize function

- fovy is field of view angle, in degrees, in the y direction

- aspect is 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) of the viewport region

- near, far specify the distance from the viewer to the near and far clipping plane (always positive)

- scale gives the scale of each element of the matrix. You can use it to improve precision in the RSP fixed-point arithmetic

Explanation
It computes and returns a 4x4 fixed-point perspective projection matrix (m) and a number to use with the gSPPerspNormalize function. For a detailed description of the fixed-point matrix format, see gSPMatrix.
See Also
guPerspectiveF
guFrustum
guOrtho
gSPMatrix
gSPPerspNormalize
gluPerspective(3G)

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Copyright © 1998
Nintendo of America Inc. All rights reserved
Nintendo and N64 are registered trademarks of Nintendo
Last Updated April, 1999