G3_Ortho

C Specification

#include <nitro/gx/g3_util.h>
void G3_Ortho( fx32 t, fx32 b, fx32 l, fx32 r, fx32 n, fx32 f, MtxFx44 * mtx );

Arguments

t Y coordinate at the top of the near clipping plane
b   Y coordinate at the bottom of the near clipping plane
l X coordinate at the left of the near clipping plane
r X coordinate at the right of the near clipping plane
n Distance from eyepoint to the near clip plane
f Distance from eyepoint to the far clip plane
mtx The pointer to a 4x4 matrix.

Return Values

None.

Description

This function sets the Matrix mode to the Projection mode. This function also sets the Orthogonal Projection matrix as the current matrix. If mtx is not NULL, then the Orthogonal Projection matrix is also set in *mtx. This function uses the Divider. The diagram shows the matrix that is set.

Note: When setting the matrix for an orthogonal projection, it will be necessary to select Z-buffering with the G3*_SwapBuffers. W buffering will not function properly because the depth value will always be fixed.

See Also

G3_OrthoW, G3_Frustum, G3_Perspective

Revision History

02/09/2004

01/19/2004 Initial version