clipka <ano### [at] anonymousorg> wrote:
> Am 09.05.2017 um 14:14 schrieb William F Pokorny:
>
> > The great news is Christoph fixed ALL the sphere_sweep auto-bounding
> > issues I have in hand in beta 6! The auto-bounding issue has dogged
> > sphere_sweeps from day one with this object.
>
> In a certain sense I cheated: Rather than trying to come up with a
> formula to compute the minimum and maximum coordinates of a sphere sweep
> based on a Catmull-Rom spline (the thing POV-Ray calls `cubic_spline`),
> I just searched the Internerds for a formula to translate a Catmull-Rom
> spline into a (temporary) equivalent Bezier spline, and then exploiting
> the neat property that a Bezier spline can never "overshoot" its control
> points.

IIIRC that is actually the only solution because afaik one cannot compute the
convex hull of a Catmull-Rom spline.

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