关于D3DXMatrixLookAtLH问题.

sinawear

        D3DXVECTOR3        postion(0,0,0);
        D3DXVECTOR3        targe(0,0,1.0f);  
        D3DXVECTOR3 up(0,1.0f,0);       
        D3DXMATRIX        v;
        D3DXMatrixLookAtLH(&v,&postion,&targe,&up);


执行如上操作:

根据公式是:
        // targe-postion =n; n=(0,0,1)
        // u=n(叉积)up; u=(0,0,1)×(0,1,0);u=(-1,0,0)
        // v=n(叉积)u;        v=(0,0,1)×(-1,0,0);v=(0,-1,0)
算出:
-1,0,0,0
0,-1,0,0
0, 0,1,0
X, X,X,1


但是结果:v却是单位矩阵.这是为什么呀?

lstarboy

结果就是单位矩阵，公式错啦
根据公式是:
// targe-postion =n; n=(0,0,1)
// u=up(叉积)n; u=(0,1,0)×(0,0,1);u=(1,0,0)
// v=n(叉积)u; v=(0,0,1)×(1,0,0);v=(0,1,0)

sinawear

无语....thank you....