[ODE] Angular velocity
Jon Watte
hplus-ode at mindcontrol.org
Thu Apr 14 13:01:48 MST 2005
Mathematics in general, and ODE (as well as OpenGL), use right-
handed conventions. If you set your Z to point up, then you will
get counter-clockwise rotation for positive velocities. The rule
is that the axis is your thumb sticking out, and the rotation is
the way your fingers bend -- right-handed.
Cheers,
/ h+
-----Original Message-----
From: ode-bounces at q12.org [mailto:ode-bounces at q12.org]On Behalf Of Yefei He
Sent: Wednesday, April 13, 2005 2:02 PM
To: ode at q12.org
Subject: [ODE] Angular velocity
Hi,
Is there any reason why angular velocities seem to be the opposite of
rotation angles? To state it less confusingly, I have an object starting
at pos(0,0,0) and rotx =0, roty = 0, rotz =0. If I set the angular
velocity around z to be a positive value, then as I look down at the
object from above, it is actually rotating clockwise, not counterclockwise
as I expect. But if I give the object a positive rotz value, it rotates
counterclockwise for the given amount. Is there any convention in dynamics
that leads to this?
Thanks,
Yefei
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