On Fri, 21 Dec 2001 09:51:15 -0500, "Trevor Quayle" <Tin### [at] hotmailcom>
wrote:
> "Tom Melly" <tom### [at] tomandlucouk> wrote in message
> news:3c2349fa$1@news.povray.org...
> > what function would return 1 when x = 0 but 0 when abs(x)>=1 ?
>
> max(floor(1-abs(x)),0)

this could be wrong becouse it return 1 when x=0 but 0 for _all_ other cases.

ABX

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