[ODE] rotation matrices

[jnilson_99 at yahoo.com]

Is there an easy way of  
using the rotation matrices to accomplish this?

using opengl this is simple, when you draw the object
draw the parent ode object first.

you have to get the rotation matrix then set it using
glMultMatrix. then cal glTranslate to move to your
child objects position. you don't have to call
glMultMatrix before drawing the child object because
the position you placed it in at startup is the same
relative position you want it to be always relative to
the parent object.

i assume the child object always stays constant
relative to the parent object otherwise that
relationship could be handled by ode.

john
--- Floris van Breugel <fv28 at cornell.edu> wrote:

> Hi,
> 
> I'm trying to attach a system of points
> (specifically not ODE  
> constructs) to an ODE body by means of updating the
> system's position  
> at each time such that any changes in position of
> the ODE body cause  
> the system to move accordingly. In order to
> completely constrain the  
> system I also need to update its rotation relative
> to the ODE body  
> such that it appears to be fully 'attached'. I was
> wondering what the  
> easiest way would be to update the position of these
> points so they  
> stay the same relative the ODE body. I've tried
> using the angular  
> velocity of the body to calculate necessary
> velocities for the  
> points, but could not get that too work. Is there an
> easy way of  
> using the rotation matrices to accomplish this?
> 
> Thanks,
> 
> - Floris
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