"Warp" <war### [at] tagpovrayorg> wrote:
>   Isn't the main problem with this that it always returns a value which
> is too small? (Although usually it doesn't matter as long as it's close
> enough to the true value...)

probably ...
because, if you do a linear-interpolation between the two points,
it is quite uncertain, that the way-on-spline is shorter ...   No?

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