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  1. Hi! Looking at transformation matrices of IFD files really confuses me. For one they seem to do exactly the opposite of what the camera's transformation parameters in Houdini are indicating, which I think is because Mantra moves the scene and there's no actual camera like in OpenGL. However what's really confusing me is if I have a camera with SRT, ZXY order and transformations rot(45, 30, 0) and trans(10, 5, 0) I get a transformation matrix in the IFD that looks like this: 0.866025396499 0.353553407243 0.353553391789 0 0 0.707106765732 -0.707106796641 0 -0.500000012618 0.612372443928 0.612372417161 0 -8.66025396499 -7.07106790109 6.53176023263e-008 1 Looking at the fourth row, I would expect to see 10 and 5 somewhere, but they don't show up. When I rebuild the same transforms in Nuke I get identical values for each component but for the last row. But the results from the IFD seem illogical to me. I'm really stuck on this, maybe you guys can help. Thanks, Nhat
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