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D3DXMatrixPerspectiveFovLH function

Builds a left-handed perspective projection matrix based on a field of view.

Syntax


D3DXMATRIX* D3DXMatrixPerspectiveFovLH(
  _Inout_  D3DXMATRIX *pOut,
  _In_     FLOAT fovy,
  _In_     FLOAT Aspect,
  _In_     FLOAT zn,
  _In_     FLOAT zf
);

Parameters

pOut [in, out]

Type: D3DXMATRIX*

Pointer to the D3DXMATRIX structure that is the result of the operation.

fovy [in]

Type: FLOAT

Field of view in the y direction, in radians.

Aspect [in]

Type: FLOAT

Aspect ratio, defined as view space width divided by height.

zn [in]

Type: FLOAT

Z-value of the near view-plane.

zf [in]

Type: FLOAT

Z-value of the far view-plane.

Return value

Type: D3DXMATRIX*

Pointer to a D3DXMATRIX structure that is a left-handed perspective projection matrix.

Remarks

The return value for this function is the same value returned in the pOut parameter. In this way, the D3DXMatrixPerspectiveFovLH function can be used as a parameter for another function.

This function computes the returned matrix as shown:



xScale     0          0               0
0        yScale       0               0
0          0       zf/(zf-zn)         1
0          0       -zn*zf/(zf-zn)     0
where:
yScale = cot(fovY/2)

xScale = yScale / aspect ratio


Requirements

Header

D3dx9math.h

Library

D3dx9.lib

See also

D3DXMatrixPerspectiveRH
D3DXMatrixPerspectiveLH
D3DXMatrixPerspectiveFovRH
D3DXMatrixPerspectiveOffCenterRH
D3DXMatrixPerspectiveOffCenterLH

 

 

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