[ODE] problems with amotor

[Jason Mallios]

So, if you've only applied it to a capsule you want to remain upright,
you're just setting lo and hi stops and have only one body, right?  Are
you sure you supplied desired turning velocities and not maximum force,
because a positive desired velocity along any axes keeps the body
rotating?

Have you tried to apply torques along self-computed axes in user mode in
order to deterministically change the angle between two ball and
amotor-joined bodies?  If anyone has, I'd desperately like to see some
sample code.

Specifically, the manual seems to suggest you have to calculate the axes
angles yourself every time step.  Is that true?  Also, can you set all
axes' relation to one body or must one of them be related to the other
body in user mode?

On Mon, 9 May 2005, Geoff Carlton wrote:

> I've used AMotors only briefly, to make a capsule-shaped character stand
> upright.  For most of the previous post's questions, the answers are
> probably - if you want it, you've got to extend ode yourself.  A bit of
> a pain, but thats what you get with a free library.
>
> I dislike Euler angles, and hence always used the user mode.   It worked
> ok for me - you just have to provide your own axis vector and then
> supply the desired turning velocities.  There may be others who have
> used it in the other modes and lived to tell the tale, I don't know.  I
> think the basic problem is that we're bad at rotation math, matrix
> operations, and euler angles (I know I am), and since the AMotor exposes
> that stuff directly its hard to get a grip on it.
>
> Geoff
>
>
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