Hello,
the background for my problem: I want to generate some scenes, where some
objects rotate.
 I want to mark the angle of rotation with a curved arrow.
Sure, I can use some difference between two (or more) sets, but, I thought
there are simplier ways to
generate this curved arrow.
Thank you, Jens.
Warp wrote:

> Jens Neumann <gs3### [at] rzuni-karlsruhede> wrote:
> : I don't want to use a difference between a torus and a box.
>
>   I think it's always a good idea to tell why this kind of decision
> (ie. discarding a solution which sounds good at first glance) was made
> if it's not obvious, as in this case.
>   If you tell why you won't be using the easiest solution, that will help
> people understand your needs and give you a better answer (or alternatively
> correct misunderstandings).
>
> --
> #local D=array[6]{11117333955,7382340,3358,3900569407,970,4254934330}
> #local I=0;#macro M()<mod(D[I],13)-6,mod(div(D[I],13),8)-3,10>#end
> #while(I<6)cylinder{M()#local D[I]=div(D[I],104);M().1
> pigment{rgb M()}}#local I=(D[I]>99?I:I+1);#end              /*- Warp -*/

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   Jens Neumann                    E-mail : gs3### [at] rzuni-karlsruhede
   Institut fuer Mechanik          Fon    : ++49-721-608-6081
   Universitaet Karlsruhe          Fax    : ++49-721-608-7990
   76128 Karlsruhe
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