# MTX_Ortho

## C Specification

      #include <nitro/fx/fx_mtx44.h>

      void MTX_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 an orthogonal projection matrix to *mtx. It 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_Ortho, MTX_Frustum, MTX_Perspective`

## Revision History

04/27/2004 Initial version

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