Gleb wrote in message <3ca86b79@news.povray.org>...
>
>"Mark Wagner" <mar### [at] gtenet> wrote in message
>news:3ca7ee05@news.povray.org...
>>
>> Not quite.  Strictly speaking, it's the amount of free memory, or the
>> largest number that can be stored in a long integer, whichever comes
>first.
>> (or in practical terms, the amount of free memory).
>
>Thank you, Mark, this is what I wanted to know.
>I'm also curious how stable is the current natural splines implementation,
>when handling huge amount of control points, because it seems that there
>are some matrix calculations involved, which possibly can be unstable
>above some limit. Is it correct?

I just use standard Gaussian elimination on a tridiagonal system of
equations to get the coefficients, so there might be a numeric stability
problem for some combinations of control points.  It's not likely to show up
for realistic sets of control points, though.

--
Mark

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