D3DXMatrixOrthoOffCenterLH function (D3dx9math.h)

Builds a customized, left-handed orthographic projection matrix.

Syntax

D3DXMATRIX* D3DXMatrixOrthoOffCenterLH(
  _Inout_ D3DXMATRIX *pOut,
  _In_    FLOAT      l,
  _In_    FLOAT      r,
  _In_    FLOAT      b,
  _In_    FLOAT      t,
  _In_    FLOAT      zn,
  _In_    FLOAT      zf
);

Parameters

pOut [in, out]

Type: D3DXMATRIX*

Pointer to the resulting D3DXMATRIX.

l [in]

Type: FLOAT

Minimum x-value of view volume.

r [in]

Type: FLOAT

Maximum x-value of view volume.

b [in]

Type: FLOAT

Minimum y-value of view volume.

t [in]

Type: FLOAT

Maximum y-value of view volume.

zn [in]

Type: FLOAT

Minimum z-value of the view volume.

zf [in]

Type: FLOAT

Maximum z-value of the view volume.

Return value

Type: D3DXMATRIX*

Pointer to the resulting D3DXMATRIX.

Remarks

The D3DXMatrixOrthoLH function is a special case of the D3DXMatrixOrthoOffCenterLH function. To create the same projection using D3DXMatrixOrthoOffCenterLH, use the following values: l = -w/2, r = w/2, b = -h/2, and t = h/2.

All the parameters of the D3DXMatrixOrthoOffCenterLH function are distances in camera space. The parameters describe the dimensions of the view volume.

The return value for this function is the same value returned in the pOut parameter. In this way, the D3DXMatrixOrthoOffCenterLH function can be used as a parameter for another function.

This function uses the following formula to compute the returned matrix.

2/(r-l)      0            0           0
0            2/(t-b)      0           0
0            0            1/(zf-zn)   0
(l+r)/(l-r)  (t+b)/(b-t)  zn/(zn-zf)  1

Requirements

See also

Math Functions

D3DXMatrixOrthoRH

D3DXMatrixOrthoLH

D3DXMatrixOrthoOffCenterRH