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"cadman" <cad### [at] graffiti net> wrote in message
news:3c4c3895$1@news.povray.org...
>
> lathe {
> linear_spline
> 4
> <-0.5, 3.5>, <-1, 4>, <-1.5, 3.5>, <-1, 3>
> }
>
> This should revolve a diamond shape around the y-axis, right? It tells me
> that the point is invalid.
Although it's not specifically stated in the documentation (unless I
overlooked it) that only positive 2D vectors be allowed, negative numbers
are often used as well. I couldn't say why your example fails but there's
probably some limitation happening. You can use positive signs on your
numbers and get a render fine; can also use negatives on the first and last
points. Anyway, there does seem to be a limitation or even possibly a bug
but I can't judge on that, only confirm your observation.
BTW, the positive version of that should be identical to the negative
anyhow.
bob h
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