D3DXMatrixOrthoOffCenterRH Function

Builds a customized, right-handed orthogonal projection matrix.

Syntax

D3DXMATRIX *D3DXMatrixOrthoOffCenterRH(      

    D3DXMATRIX *pOut,
    FLOAT l,
    FLOAT r,
    FLOAT t,
    FLOAT b,
    FLOAT zn,
    FLOAT zf
);

Parameters

pOut
[in, out] Pointer to the D3DXMATRIX structure that is the result of the operation.
l
[in] Minimum x-value of view volume.
r
[in] Maximum x-value of view volume.
t
[in] Minimum y-value of view volume.
b
[in] Maximum y-value of view volume.
zn
[in] Minimum z-value of the view volume.
zf
[in] Maximum z-value of the view volume.

Return Value

Pointer to a D3DXMATRIX structure that is a customized, right-handed orthogonal projection matrix.

Remarks

An orthogonal matrix is an invertible matrix for which the inverse of the matrix is equal to the transpose of the matrix.
The D3DXMatrixOrthoRH function is a special case of the D3DXMatrixOrthoOffCenterRH function. To create the same projection using D3DXMatrixOrthoOffCenterRH, use the following values: l = -w/2, r = w/2, b = -h/2, and t = h/2.
All the parameters of the D3DXMatrixOrthoOffCenterRH 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 D3DXMatrixOrthoOffCenterRH 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/(zn-zf)   0
(l+r)/(l-r)  (t+b)/(b-t)  zn/(zn-zf)  1

Function Information

Header d3dx9math.h
Import library d3dx9.lib
Minimum operating systems Windows 98

Header	d3dx9math.h
Import library	d3dx9.lib
Minimum operating systems	Windows 98