I found this thread discussing this question, and I noticed this set of postings:

lydesik:

my matrix are ROW_MAJOR here are my matrixes modelViewMatrix

0.998775 -0.007211 0.048951 0.000000

-0.006447 -0.999855 -0.015741 0.000000

0.049058 0.015406 -0.998677 0.000000

0.085168 -0.049039 1.303295 1.000000

inverseModelViewMatrix

0.998775 -0.007211 0.048951 -0.149216

-0.006447 -0.999855 -0.015741 -0.027968

0.049058 0.015406 -0.998677 1.298148

0.000000 0.000000 0.000000 1.000000

here is the code i'm using to print the matrix

void printMATRIX4X4(MATRIX4X4& matSrcMatrix) { MATRIX4X4* s = &matSrcMatrix; LOGI(

"%f %f %f %f",s->M(0,0), s->M(0,1), s->M(0,2), s->M(0,3));

LOGI("%f %f %f %f",s->M(1,0), s->M(1,1), s->M(1,2), s->M(1,3));

LOGI("%f %f %f %f",s->M(2,0), s->M(2,1), s->M(2,2), s->M(2,3));

LOGI("%f %f %f %f",s->M(3,0), s->M(3,1), s->M(3,2), s->M(3,3));

ksiva:

So if you look at your inverse modelview matrix, the 3rd column should be the camera lookAt and the 4th column should be the camera position. Pull those values out however you'd like! - Kim

In my application, I set the camera to the transpose of the projection and pose matrices every frame. This has been working for me, but in my game engine, the camera's position isn't updated when using matrices directly, so I need to be able to get the cameras position and orinetation/look at from these matrices. I tried setting the cameras position and look at with the 3rd and 4th columns of the inverse of the pose matrix, but that doesn't work as expected. Any help?

I also found this post, but my game engine doesn't have the API calls needed to set the up and right vectors for the camera. I was able to get the 3x3 matrix out of the inversed pose matrix and create a quaternion out of that, figuring it had rotation information, but setting the camera's roientation to that quaternion didn't work as expected either.