> On 2005-05-03 (13:17) SourceForge.net wrote: > >>Category: Scripting >>Group: None >>Status: Open >>Resolution: None >>Priority: 5 >>Submitted By: friedar (friedar) >>Assigned to: Nobody/Anonymous (nobody) >>Summary: show orientation typo >> >>Initial Comment: >>Show orientation gives the z rotation spec twice, omiting the x >>spec. >> >>---------------------------------------------------------------------- >> >>Comment By: molvisions (molvisions) >>Date: 2005-05-03 16:17 >> >>this happens in function getRotateZyzText() in >> >>src/org/jmol/viewer/TransformManager.java. >> >>but is this actually a bug? I'm confused because there is an rY and >>two rZ values, but no rX. also, the function appears below a >>commented-out getRotateXyz(), which makes me think there is a reason >>for this double z- rotation. >> > > ok, answering my own question, this is NOT a typo. the combo of rZ1, rY, > rZ2 produces the correct orientation. > > so out of curiosity, can I ask why it is done this way instead of an xyz > rotation (or zyx)?
The majority of mathematicians say that ZYZ is the established "standard" way to do it. As I recall, the aeronautical engineers (in the minority) do it another way (YZY?) ... but nobody does it XYZ. Miguel ------------------------------------------------------- This SF.Net email is sponsored by: NEC IT Guy Games. Get your fingers limbered up and give it your best shot. 4 great events, 4 opportunities to win big! Highest score wins.NEC IT Guy Games. Play to win an NEC 61 plasma display. Visit http://www.necitguy.com/?r _______________________________________________ Jmol-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/jmol-developers
