[ODE] FW: Quick dQuaternion question
andrew at lookaheaddecisions.com
Fri Jun 2 22:58:12 MST 2006
Just forwarding to the list for everyone's reference. Thanks Tomek.
From: tomek [mailto:klinikk at o2.pl]
Sent: Friday, June 02, 2006 6:17 PM
To: Andrew Arcilla
Subject: Re: [ODE] Quick dQuaternion question
> I just want some confirmation about the dQuaternion object. So, could
> someone please tell me how ODE interprets the order of the dQuaternion
> array? In other words, does dQuaternion refer to W or X?
>From ODE Manual:
"9.1. Rotation functions
Rigid body orientations are represented with quaternions. A quaternion
is four numbers [cos( theta /2),sin( theta /2)*u] where theta is a
rotation angle and u is a unit length rotation axis."
The order is [W,X,Y,Z].
More information about the ODE