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2008年10月6日

2008-10-06 22:26:38| 分类：其它各种垃圾 | 标签： |举报 |字号大中小订阅

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D3DXMATRIX *WINAPI D3DXMatrixLookAtLH(

D3DXMATRIX *pOut,

CONST D3DXVECTOR3 *pEye,

CONST D3DXVECTOR3 *pAt,

CONST D3DXVECTOR3 *pUp

);

参数：

pOut

[in, out] 指向 D3DXMATRIX 结构的返回结果的矩阵。

pEye

[in] 指向D3DXVECTOR3 结构的眼睛所有在位置向量。这个值会用来作平移。

pAt

[in] 指向 D3DXVECTOR3 结构的摄像机观察目标位置向量。

pUp

[in] 指向D3DXVECTOR3 结构的当前世界坐标系向上方向向量。通常用[0, 1, 0]向量。

返回值：

指向D3DXMATRIX 结构的左手坐标系观察矩阵。

说明：

返回值是跟参数pOut 返回值是一样的。通过这样方式，可以让D3DXMatrixLookAtLH 函数成为其它函数的参数。

这个函数用下面的公式来计算返回的矩阵：

zaxis = normal(At - Eye)

xaxis = normal(cross(Up, zaxis))

yaxis = cross(zaxis, xaxis)

xaxis.x yaxis.x zaxis.x 0

xaxis.y yaxis.y zaxis.y 0

xaxis.z yaxis.z zaxis.z 0

-dot(xaxis, eye) -dot(yaxis, eye) -dot(zaxis, eye) 1

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