What causes the "singular" matrix error in Shear_Trans?  If it is that it is
unable to shear from <a,b,c> to <a,b,c>, then isn't it possible to add some
"epsilons" to the matrix and prevent that problem?


clipka <ano### [at] anonymousorg> wrote:
> 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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