POV-Ray question: splines

POV-Ray question: splines

Post by Eric J. Ro » Fri, 12 Dec 2003 12:05:55


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Is it documented anywhere what the difference is between the
bezier_spline, b_spline, and cubic_spline options for various objects
in POV-Ray? I haven't been able to find anything in the docs about
how the various splines are computed.

I know what a bezier spline is, and I know what a b-spline is (in
general terms), and I know roughly what a cubic spline is. But a
cubic spline may be a bezier spline, and a bezier spline may be a
cubic spline, and a b-spline has various forms depending on the
chosen knot vector.

Also, does anyone know why you can use some of these things in
certain contexts in POV-Ray and not in others? For example, a lathe
object can take a bezier spline. A spheresweep object can't, but it
can take a b-spline. And so on.

Thanks,
- --
Eric
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