I finaly finished creating the bicycle chain. I wrote code to create a
looping chain around two circles, which I never thought I would be able to
do. And although there is still plenty of room for improvement, I am not
really that good at math so I am moving on.

By the way, this chain was created with the following circle definitions:
<-5, 0, 0>, 1.5  and <5, 0, 0>, 2.5

Comments please.

Post a reply to this message

Attachments:
Download 'chain.jpg' (26 KB)

Preview of image 'chain.jpg'

I am interested in your macro. I'd like to see it.

You might have a look at these links :

http://library.thinkquest.org/3285/gather/objects/Chain.html

http://perso.wanadoo.fr/mops/atelier.htm


Fabien H

Peter Ketting wrote:
> I finaly finished creating the bicycle chain. I wrote code to create a
> looping chain around two circles, which I never thought I would be able to
> do. And although there is still plenty of room for improvement, I am not
> really that good at math so I am moving on.
> 
> By the way, this chain was created with the following circle definitions:
> <-5, 0, 0>, 1.5  and <5, 0, 0>, 2.5
> 
> Comments please.
> 
> 
> 
>

Post a reply to this message

"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

Post a reply to this message

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
> 
> 
>

Post a reply to this message