D3DXMatrixLookAtLH
D3DXMATRIX * D3DXMatrixLookAtLH(
D3DXMATRIX * pOut,
CONST D3DXVECTOR3 * pEye,
CONST D3DXVECTOR3 * pAt,
CONST D3DXVECTOR3 * pUp
);
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) l
这个函数作用是以eye ......
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