Tom Melly wrote in message <3af96140$1@news.povray.org>...
> --
> "To stop children being afraid of the dark, try to fill their daylight hours
> with as much terror as possible"
> www.tomandlu.co.uk

what kind renderer should I use with such sig ? internet browser ? ;-)

ok. now notes:
1. why "A" ? just "" for name of spline
2. 2*x instead of <2,0>
3. 2*y instead of <0,2>
4. B)D instead of B),D

--
#macro Sig(A,B,X)_(A,B)_(B,X)_(X,A)#end#macro _(A,B)cylinder{<A.x,A.y,3>,<B.u,
B.v,3>.1,9}#end global_settings{max_trace_level 9}light_source{0 1}camera{up y
*4right-3*x}blob{_(<3,1>,<1,-5>)_(<2,-2>,<4,-2>)Sig(x,<-1,1.5>,<1,3>)_(z-1,z-4
)pigment{rgb 1}}box{-3 3pigment{rgb 0}finish{reflection 1}hollow} // POV-Ray31

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