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Rohan Bernett wrote:
> Okay, enough grumbling, can anyone give me some advice (or better still a
> code exaple) on how to make a tree using recursive functions. My best
> vaugly recursive attempt at making a tree involved making several objects
> of different levels of the tree and adding them at different levels. i.e.
> one level with leaves, then one using branches with 3 leaves on them, then
> one using 3 branches from the one before and so on. It does look like a
> tree, but not very realistic.
My advice would be to look through the various tree include files you will
find here and look for inspiration from what others have done. You may
actually find you don't need to reinvent the wheel and someone already
has something you can use.
http://www.povray.org/resources/links/POV-Ray_Include_Macro_and_Object_Files/
--
Ken Tyler
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In article <web.3d69968af01f31b4d02c7b870@news.povray.org>,
"Rohan Bernett" <rox### [at] yahoo com> wrote:
> I'm no good at writing recursive functions. :-( I've used them a couple of
> times in c++ in my uni assignments, but I always find them a pain in the
> arse to write.
It isn't too difficult, and there are many examples of this technique in
the various plant generator include files.
> Okay, enough grumbling, can anyone give me some advice (or better still a
> code exaple) on how to make a tree using recursive functions. My best
> vaugly recursive attempt at making a tree involved making several objects
> of different levels of the tree and adding them at different levels. i.e.
> one level with leaves, then one using branches with 3 leaves on them, then
> one using 3 branches from the one before and so on. It does look like a
> tree, but not very realistic.
You need to use more randomness...real plants don't branch precisely a
certain number of times at exact intervals with straight stems in
between. In my systems, I only branch every once in a while, each
recursion has a certain probability of branching. I also added various
forces such as gravity, wind, light, etc. Start out with a simple
framework and add rules and tweaks to it.
Also, be aware that POV can only recurse a certain number of levels, my
technique recurses very deeply so I hit this limit hard. You can mimic
virtually unlimited recursion by using something more like a particle
system where each particle traces out the path of a limb and splits into
two particles to branch. I've been playing with this, but my system is
written in Sapphire, not POV.
--
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/
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