Am 10.03.2011 13:22, schrieb gregjohn:

> Thanks for the elegant fixes suggested.  Your code however bombed out after
> about 80 frames to to the singular matrix inverse problem.

I don't see why this should happen, unless at some point your spline 
heads straight at (or away from) the center.

Also note that the code I proposed presumes that your spline lies on 
(sufficiently close to) the surface of a sphere around the center.

> I had to fix the
> Shear_Trans macro to be that below.

Again you're just suppressing the problem for a particular scene, still 
risking bombing in others, rather than really fix it.

> For some reason, I end up with guys facing
> forward (+Z) in my work.

That's just strange.

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