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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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