"Warp" <war### [at] tagpovrayorg> wrote in message
news:3ca86c65@news.povray.org...
>   What do you mean by stability?

When small variation of the control points values(rounding errors, in fact)
should lead to small variation in the spline function(spline polinomial
coefficients).
With calculation on big matrices it is not always true.

>   I don't understand how the implementation can become unstable for a
bigger
> number of control points.

Simple example: we have one big number and a whole lot of very small,
the result depends of the order of summarizing because of rounding errors.

Atb,

Gleb

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