d3d射线和平面

 下面是将屏幕上的点转换到3d空间射线，这个其实通过对世界矩阵求反也可以得到

 

POINT ptCursor;GetCursorPos( &ptCursor );ScreenToClient( getMainWnd(), &ptCursor );D3DXVECTOR3 vScreen((float)ptCursor.x,(float)ptCursor.y,/*0.0f*/viewPort.MaxZ),vOut;D3DXVec3Unproject(&vOut,&vScreen,&viewPort,&mProj,&mView,&mWorld);

 

平面的创建和计算射线与平面交点

 

D3DXPLANE plane;int index = -1;D3DXVECTOR3 v1(0.0f,0.0f,0.0f);D3DXVECTOR3 v2(0.0f,1.0f,0.0f);D3DXPlaneFromPointNormal( &plane, &v1, &v2 );D3DXVECTOR3vMousePt;D3DXPlaneIntersectLine( &vMousePt, &plane, &cameraPos, &vOut );