You can convert the matrices by simply rotating by PI around X. I've no idea if that fixes the problem though. It's a bit unlucky that QCAR returns a model view matrix. The camera's matrix is actually the rotational part of the view matrix. The model matrix is the one that transforms the object. Both combined are the modelview matrix, but that's actually not what the camera should contain. If done correctly, it'll work though...but it's still not the right way...

i am posting matrices to be more clear:

modelviewmatrix:

1.512537 -159.66255 -10.275316 0.0

-89.86529 -1.1592013 4.7839375 0.0

-8.619186 10.179538 -159.44305 0.0

59.182976 93.205956 437.2832 1.0

modelviewmatrix after reverse using cam.setBack(modelviewmatrix.invert(modelviewmatrix)) :

5.9083453E-5 -0.01109448 -3.3668696E-4 0.0

0.0040540528 -3.8752193E-4 0.0047518034 0.0

-0.004756433 -4.6811014E-4 0.0040459237 0.0

0.7533285 0.4116795 2.7063704 0.9999999

exactly what matrix is needed to draw model ?Rotaional,model or view matrix and what is the role of FOV ?i am bit confuse between these,please help me out