Reaction diffusion curves

[Gears_Gears]

Hi!

Is there a way to get reaction diffusion pattern as curves? I found a lot of mesh implementation but they all need to be super dense for the pattern to show. Visually, it seems that the pattern is the result of pipes along curves (though I am aware that this is now how reaction diffusion works)

Many Thanks!

[PeterFotiadis (Pfotiad0)]

Like this? (spot the “2dvoxel/pixelation” approach)

Reaction-Diffusion Tutorial

If you can code:

Build software better, together

Exploring 2D differential growth with JavaScript

BTW: On the other hand doing things like these is rather elementary:

BTW: Laurent likes similar freaky things.

[laurent_delrieu]

Hello

@Gears_Gears

get reaction diffusion pattern as curves?

Or your question is not clear or you didn’t search a lot.
Reaction diffusion output values on mesh. Theses values/double can be transformed to displacement or color or be used by mesh iso spliting. All the tools are in Nautilus plugin. I made some more advanced way to have nice curves.

Mesh iso spliting outputs meshes or curves.
Come back with a script or better description if there is a problem

Better smoothness using Catmull & Clark subdivision on mesh and values ! Exclusivity of Nautilus plugin

Not smoothed

Smoothed via Catmull & Clark

Nautilus plugin

Version 0.9 was added with some new components Loxodrome, Loxodrome Piped [Loxodrome] Color Mesh Weights [RDext_Nautilus] Mesh Remove Color : a component that removes all the colors on vertices for a mesh. Spiral4D : related to this discussion Smoothing Weights on Mesh 1: Laplacian Smoothing of weights associated to vertices of a mesh, this algorithm uses Rodolphe Vaillant and Daniel Piker tools Diffusing / smoothing weight map over a triangular mesh. - Rodolphe Vaillant's homepage Di…

[Gears_Gears]

Thanks for your help!

[Gears_Gears]

Thanks for your help! You have a great plugin!

[Peter_Davis]

Hello all, esspessially @laurent_delrieu been following your stuff for years.

Recently got a gig with a client and they are after hexagon reaction diffusion.
Its kinda a balance between chaos and order. Tried attacking it many ways but getting mixed results.

I downloaded various VS/c#/python code and a few gh hacks. best if found is @laurent_delrieu Nautilus plugin, for speed of exicutions on the Reaction Diffusion on the mesh input. Also has nice synergy with @DanielPiker Kangaroo by making a mesh have non uniform triangular faces driven from circle packing code.

Wonding if you ninjas have a few good ideas. Attached the picture of the mood board.
If i get some where ill let you guys know.

[laurent_delrieu]

Hello
it is not clear what is a

@Peter_Davis

hexagon reaction diffusion.

from your image I see this

Modelling Mushroom Gills in grasshopper or python how?

hi , i am self Lerner and I am interested to draw mushroom gills in grasshopper or python but i dont know how to start . the picture below is my inspiration. [Capture2]

I also see thinks that look like a reaction diffusion with coefficients depending on the position.

[Peter_Davis]

Sure here is an idea of where im trying to get to.
this is why i like the Nautilus RDiffusion as it incorperates vector directions.

Ideally i need to make this into curves or mesh then i can combine with other varibles to raise and lower the shapes via displacement.

[laurent_delrieu]

Hello
I think you are more searching something like that
What I did

Entagma work

Dual Sculptures

[Gears_Gears]

I saw this kind of https://twitter.com/_jasonliu_/status/1744060050925048293 where RD lines are ‘noodled’ cleanly like this

This (and RD) is, it turns out, simple to do on 2D images, as you and Pfotiad0 kindly pointed out. Though I’ve yet to figure out how to transfer this process to mesh, the faces/vertices of which do not cleanly fall into a non-sparse 2d matrix (reaching the limit of my vocabulary…). I’m reading the code you kindly shared to study how to proceed.

[laurent_delrieu]

Hi
I will add a little tool to add this kind of subdivision.
Having a triangulated mesh

A value is set at each edge. With a threshold value the edge is a barrier or not. For example if random value is set
Threshold = 0.25

Threshold = 0.5

You will be able to apply other way to put values on edges. For example from maze tool

Or noise tool

Here a view with the 3 materials

So you can apply material like Entagma

[Peter_Davis]

NICE,

I came to the same conclusion after playing around all week. So much more potential here.

first mesh is Kangaroo (b&w) white being larger more crazy faces, then the color clustering determines how many connections there are.

next week should have a solid result that closer with more varibles.

@laurent_delrieu ive been writing itin c# if you want to intergrate?

Cheers
Pete

[laurent_delrieu]

Hello
very cool to see some very nice work. For the integration of you tool why not. I have done mine that will be in Nautilus plugin. It is quite generic (I hope).
The logic is to put a weight on the edge and if above the limit, there will be a Valley crossing this Edge.
So I have made some tool to add weights on edges.
For example here sort of curvature (like Entagma) along the edge and on the side of the edge

Using these values on edge , I have now this component that make the meshes, each face as an index (0 1 or 2) so it could be possible to assign different material but also to Subdivide the whole mesh using Catmull and Clark subdivision and keeping material

It is also possible to use my Maze tools

Or cluster then maze

Angle on edge from curve is also possible

And direction + reaction diffusion

And field could be used also

[cfee]

this must be the materialized result

[Peter_Davis]

Give this guy a detective job. Spot on.
in the process of making diffrent data driven treads for our clients. then they can choose what they want on the foot and the use case also effects the parameters.

the pic you just linked is a partnership with a company called Balena. scan foot, create shoe, 3dp, recycle back to nature.

[cfee]

I’ve been exclusively been wearing VivoBarefoot for about 5 years now .. so i know my brand , hahaha great to see how creative code, ideas & techniques with gh are being used worldwide in so many different industries

[Gears_Gears]

Hi Laurent! I really like this pattern you made. If you have time, could you please share some insights on how you (it seems) ‘filleted’ the edges of the mesh?

I’m referring to the golden outlines on the sand-blue mesh, or the green meshes of the red-green-blue picture. I’m coming from this question Fillet mesh edge (I got completely stuck )

[laurent_delrieu]

Hello
Examples could be foun in example zip on Nautilus page on food4rhino. They are in mesh directory. You ll find images also that will help you to find the good script.

Nautilus

[Gears_Gears]

Thanks a ton!

[Gears_Gears]

Hi Laurent,

I downloaded but,

1. if I drag Nautilus, to components folder, it says there are license problems, and only give partial result
2. if I uninstall and let package manager find, it says ‘No compatible distribution found for Nautilus (1.2.0.0)’ I saw your comment on the plugin page that it should be 1.3.0?
3. I also tried download from package manager but the result is same as 1)

Many Thanks