Plants will grow towards a light source, it's called phototropism (which I
learned about a long time ago and never thought to find a use for).  you'll find
that in a dark room with light coming through a hole in the ceiling, vines will
grow along the floor toward the light, and will generally try to find the hole
in the ceiling. Perhaps your model could account for the direction of the light
source as well.  It would be a matter of weighting the probability of a split in
a given direction by the amount of light in that direction or the probability of
reaching light by growing in that direction.

Otherwise, I think it's excellent work, and I wonder if it could be applied to
other plant life, like trees and shrubs.

Are you predetermining the starting location, or is it random?

A.D.B.

"Thomas de Groot" <tDOTdegroot@interDOTnlANOTHERDOTnet> wrote:
> "Christian Froeschlin" <chr### [at] chrfrde> schreef in bericht
> news:4a4e1f30$1@news.povray.org...
> > Also, there is a lot of ivy on top of the objects while the
> > walls are more thinly covered. I'm no expert on ivy but this
> > seems a bit odd (but probably it just needs more starting
> > points to cover a wall).
>
> In some way, real ivy seems to concentrate on the top of walls/objects,
> maybe because sunlight is stronger there. At least, that is what I observe
> in my garden, so the ivy generator is doing a good job :-)  Thomas Luft's
> generator shows exactly the same phenomenon.
>
> Thomas

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