algorithmic modeling for Rhino
Directional Reaction-Diffusion on a cactus.
The cactus shape is done using Cocoon from
http://www.bespokegeometry.com/2015/07/22/cocoon/
3 curves are used. A directional reaction diffusion is applied to the mesh. The script is based on
http://www.grasshopper3d.com/forum/topics/reaction-diffusion-on-triangular-mesh
Tags:
Albums: Reaction diffusion
Comment
@Alex : surely it could be mushrooms. It also could be patterns on sand.
@Daniel : I wanted to recreate something like "reaction" from nervous. What I read said that diffusion was modified. So I modified Laplacian calculation depending on a direction. For each vertex of the mesh I calculate the difference between the value of concentration of this vertex from each of its neighbor. I do a multiplication on this difference depending on the angle between the edge and a vector placed on the vertex. If teta is the angle I do multiply :
Math.Sqrt(Math.Sin(teta) * Math.Sin(teta) + _factor * _factor * Math.Cos(teta) * Math.Cos(teta));
There is no change for teta = 90° and 270° and a multiplication of _factor for 0° and 180°. (if factor is 1 there is no change instead it is an ellipse).
I then apply this modification (coeffs) uniquely on B species.
dxB = dxB + coeffs[i_point, i_vv] * (B[_VV.Branch(i_point).ElementAt(i_vv)] - B[i_point]) / _VV.Branch(i_point).Count;
So it is. Here I multiply by 5 and and put a diffusion B = 0.1. But if multiplied by 10, diffusion B = 0.05 ...
I will post example on the forum.
Very good result, what method did you use to address so strong?
very nice! this could recreate the back of some mushrooms!
Very nice Laurent!
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