Jens,

You can easily make some very nice arrows that will look like ribbons floating in
the air using either spatch or hamapatch, both of which are excellent free
modellers.  The only caution: if you make them flat (not out of a flattened tube
or something like that), the panels have no thickness at all (a lot like a
polygon object), and if your camera gets edge-on, they will essentially
disappear.  This can easily be avoided, however.

See the POV web site for links to them.

HTH !!

      Randy Hawley

Jens Neumann wrote:

> 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 -*/
>
> --
>   -------------------------------------------------------------------
>    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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