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konstantin magnus

Mycelium growth

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A simple mycelium growth simulation that works in 2D and 3D:

mycelium_02.thumb.jpg.882a96dd0a8f64c149e9e2bdbf69036a.jpg

It constantly adds points to the outer edge of point clouds (1) and favours doing so towards food (2).


1: Direction away from surrounding points:

float radius = chf('radius');
int pts_max = chi('max_points');

int handle = pcopen(0, 'P', v@P, radius, pts_max);
vector pos_avg = pcfilter(handle, 'P');
vector dir_avg = v@P - pos_avg;

v@N = dir_avg;


2: Weighting probabilities and adding points:

int pt_near = nearpoint(1, v@P);
vector pos_near = point(1, 'P', pt_near);
float prox = distance(v@P, pos_near);

float weight_prox = fit(prox, prox_min, prox_max, 0.0, 1.0);
float weight_rim = fit(length(v@N), rim_min, rim_max, 1.0, 0.0);
float weight = dens * (weight_rim + weight_prox);

if(nrandom('mersenne') > weight){
    vector pos_add = v@P + normalize(v@N) * offset;
    int pt_add = addpoint(0, pos_add);
    addprim(0, 'polyline', i@ptnum, pt_add); 
}

 

mycelium.hiplc

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