I want to calculate the position of the camera, but I always get a vector of zeros.
D3DXMATRIX viewMat;
pDev->GetTransform(D3DTS_VIEW, &viewMat);
D3DXMatrixInverse(&viewMat, NULL, &viewMat);
D3DXVECTOR3 camPos(viewMat._41, viewMat._42, viewMat._43);
log->Write( L"Camera Position: %f %f %f\n", camPos.x, camPos.y, camPos.z);
We would first need to see what happen in that GetTransform function.
And secondly we usually build the view matrix from the camera information and not the opposite, you're confusing me a little bit on that part. Can you explain your scenario a little more?
Some cameras are always kept at 0, 0, 0 and the world moves around them.
Set a break point after the GetTransform function and see what the values are before the inverse and see if they make sense. I'm not a D3D guy so YMMV.
If the camera is indeed fixed, how can I estimate the distance between the camera and the geometries in the scene.
What I have on hand is the following information:
1) The vertex positions
2) The world transformations of the geometries
3) Probably the camera is at 0,0,0 then
thanks
Jack
