I use a good (and free) tree generator that exports to POV files :

ARBARO (http://arbaro.sourceforge.net/)

If you don't want to use it but you rather want to write your own macro, the 
theory is well explained in the PDF file :
http://www.cs.duke.edu/education/courses/fall02/cps124/resources/p119-weber.pdf

If it can help you, as Arbaro is open source you can download the source 
code and read it.

Good luck to your project


web.42ea5964ab8cade7e32e54c40@news.povray.org...
> I'm interested at some point in taking on writing a random tree macro.
> Probably mesh-based. I would just like to know, from those who have 
> written
> them, where do you begin? What's the general theory for going about it? I
> assume there is much recursion involved. If you begin with one triangle in
> the mesh, how does the macro figure out where to place subsequent vertices
> as it builds the tree? Basically, I want to know just how far over my head
> just a task would be. ;-)
>
>

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