> > What you asked about the front/back or leading/trailing
> > sides is simply a matter of pulling a vector from out of the
> > spline by its time (or t) value. Such as I did to place the
> > light_source ahead of center. It's just any amount +/- of
> > the clock, in that example. And then the question about
> > going up walls would be done by adding y values to the
> > sphere_sweep and spline vectors.
>
> Thanks... that sounds simple enough.

Ummm... it just hit me that only takes care of forward and
back.  In 2D that's fine but if my bike climbs walls, I can
point it forward but how do I know the wheels will be on
the floor (or wall in this case)?  Think of unit vectors pointing
in the x/forward direction, y/upward direction, and z/left
direction coming from the point that's traveling along the
spline.  The above tells me how to define x but if I can climb
walls or fly I need to know how to find y or z.  One will
give me the other but at the moment I'm not sure how to
find either.

Carl

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