"John VanSickle" <evi### [at] hotmailcom> wrote in message
news:4373e268@news.povray.org...
> >>... abs() already exist in pov
> >
> >
> > what's abs() got to do with sign(), except that you can make sign() with
sign(x)=x/abs(x) ?
>
> With a divide-by-zero error when x==0.

ah, yes, (x!=0?x/abs(x):0) then!

cu!
--
#macro G(b,e)b+(e-b)*C/50#end#macro _(b,e,k,l)#local C=0;#while(C<50)
sphere{G(b,e)+3*z.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1;
#end#end _(y-x,y,x,x+y)_(y,-x-y,x+y,y)_(-x-y,-y,y,y+z)_(-y,y,y+z,x+y)
_(0x+y.5+y/2x)_(0x-y.5+y/2x)            // ZK http://www.povplace.com

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