D3DXMatrixPerspectiveOffCenterLH Function

Builds a customized, left-handed perspective projection matrix.

Syntax

D3DXMATRIX *D3DXMatrixPerspectiveOffCenterLH(      

    D3DXMATRIX *pOut,
    FLOAT l,
    FLOAT r,
    FLOAT b,
    FLOAT t,
    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 the view volume.
r
[in] Maximum x-value of the view volume.
b
[in] Minimum y-value of the view volume.
t
[in] Maximum y-value of the 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, left-handed perspective projection matrix.

Remarks

All the parameters of the D3DXMatrixPerspectiveOffCenterLH 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 D3DXMatrixPerspectiveOffCenterLH function can be used as a parameter for another function.
This function uses the following formula to compute the returned matrix.
2*zn/(r-l)   0            0              0
0            2*zn/(t-b)   0              0
(l+r)/(l-r)  (t+b)/(b-t)  zf/(zf-zn)     1
0            0            zn*zf/(zn-zf)  0

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