[ODE] dAMoterUser , angle between to vectors and possible winding problem

[Graham Fyffe]

You might try a method that's based on cross products, instead of dot
products, since cross products contain sign information.

- Graham

On 5/3/05, jnilson_99 at yahoo.com <jnilson_99 at yahoo.com> wrote:
> 
> Could someone look at the following url and tell me if
> it's an adequate way to find the angle between two
> vectors for use by dJointSetAMotorAngle.
> 
> www.jtaylor1142001.net/calcjat/Solutions/VDotProduct/VDPTheta3D.htm
> 
> i'm using a ball and socket with an amotor in
> dAMotorUser mode. when i use the "classic" method
> above for finding the angle between two vectors(i.e.
> the x,y,z axis of the body and world rotation
> matrixes), my joint flips out.
> 
> which makes me think maybe i'm not including "winding"
> order into the angle information. is this important
> for getting the correct angle to send to ode?
> 
> thanks,
> 
> john
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