The problem with the circles that have to be a little left or right from 
the origin of the shaft is a known problem in 3d-programs.
You made no hole in the circle abd povray does not know what to render, 
the circle or the shaft. Making a hole in the circle is the realistic 
but slow way, the moving of the circles is the way to get faster renders.

I have made a model of a "pedalcopter" some month ago, it has a much 
more complex chain and i was thinking about a macro, too.

You can have a look at the pedalcopter-pics on

http://www.latent.killozap.de

but only in german language ...

Hartmut


Peter Ketting schrieb:
> "fabienhenon" wrote in message...
> 
> 
>>I am interested in your macro. I'd like to see it.
> 
> 
> I posted the source in p.b.s-f.
> 
> Please note the following:
> 
> (a) It is not the final version yet.
> (b) There is alot of room for improvement.
> (c) My math skills are very limited.
> (d) chain.inc pulls its textures from a seperate "materials.inc" include
> file.
> (e) If you declare DEBUG, it will render the chain showing every other link
> and omits the copper pins.
> (f) Right now, the left circle has to be left of the origin, as well as the
> right circle needing to be right of the origin. (something I have to work on
> still).
> 
> If you have any questions, feel free to ask me.
> 
> Cheers,
> Peter
> 
> 
>

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