"Norbert Kern" <nor### [at] t-onlinede> wrote:
>
> Thank you, Sean.
> It's a pity not to see an IRTC entry from you last round.
>

Thanks Norbert, I did not have any good ideas for the last round or much
time to experiment but I have already started on my entry for this round..
I hope to see another scene from you, your last two entries have been
excellent!

Sean

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This tool of yours, can it be downloaded somewhere? I would love to try it 
out...

Sven



"Norbert Kern" <nor### [at] t-onlinede> schrieb im Newsbeitrag 
news:web.44aecceb9373cf132680557b0@news.povray.org...
> Hi,
>
> I want to share the first results of my planned plant distribution tool.
>
> In principle it's an solvable problem, see
> http://graphics.stanford.edu/papers/ecosys/ecosys.pdf for a basic 
> procedure
> example.
> First you have to check distances to all neighbors of each plant. 
> Dependent
> of the distance and whether the neighbor is another species or not,
> increase or decrease the size of the plants. A plant will be replaced 
> after
> several iterations or if the size becomes too small.
> The problem is to avoid checking each plant against each other on each
> iteration, because this leads to n*(n-1) checks, if n is the number of
> plants.
>
> My idea is to use my favorite povray commands - 'trace' and 
> 'eval_pigment'.
> For each plant a disc is defined with a cylindrical pigment. Then you 
> search
> for neighbors by conducting traces. If you hit a neighboring disc, you 
> check
> the pigment at this point. This way I 'linearized' the problem, at least I
> hope so.
> So I implemented aging and influences of several species - light, water,
> roots, (soils, slope...) will be considered next.
>
> The image shows distributions of four species after 1, 10 and 40 
> iterations,
> each with equal plant parameters. A regular start distribution pattern was
> chosen to show the effect. After 40 iterations representing 2.5 average
> lifetimes no pattern is recognizable anymore.
> A simple render with four different plants shows this result.
>
>
> Norbert Kern
>

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