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rotation angles - convention

Posted: Tue Jul 05, 2011 6:49 am
by spinomek
I wonder how the rotations of a body (specified for example by <xyz_body_rotation>, <transform> or <orientation>) are defined. I noticed that they are performed wrt body origin, and therefore I assume that they are performed around body coordinate axis, too.
But how is the sequence of applied rotations, and are further rotations performed about the new axis or about the initial ones?
Would highly appreciate your help!

RE: rotation angles - convention

Posted: Wed Jul 06, 2011 11:19 am
by aymanh
Hi Marcos,

OpenSim uses the convention of Body-Fixed rotations and not Space-Fixed rotations, if that doesn't explain please let me know and I'll point you to more documentation.

Best regards,
-Ayman