ofxReactionDiffusion

<img src="https://github.com/matsune/ofxReactionDiffusion/blob/master/thumbs/header.png" width="700">

ofxReactionDiffusion is openFrameworks addon for visualizing Reaction-Diffusion System using GPU.

Installation

Copy to openFrameworks > addons.

Reaction Diffusion System

Reaction–diffusion systems are mathematical models which correspond to several physical phenomena: the most common is the change in space and time of the concentration of one or more chemical substances: local chemical reactions in which the substances are transformed into each other, and diffusion which causes the substances to spread out over a surface in space.
(from Wikipedia)

Models

Reaction-Diffusion System has a few mathematical models and ofxReactionDiffusion implements three models of them.

- Gray-Scott

<img src="https://github.com/matsune/ofxReactionDiffusion/blob/master/thumbs/gs.gif" width="500">

- FitzHugh-Nagumo

<img src="https://github.com/matsune/ofxReactionDiffusion/blob/master/thumbs/fhn.gif" width="500">

- Belousov-Zhabotinsky

<img src="https://github.com/matsune/ofxReactionDiffusion/blob/master/thumbs/bz.gif" width="500">

Usage

Models are defined ReactionDiffusionMode . You can switch drawing model by void setMode(ReactionDiffusionMode _mode) .

Since each mode has its own parameters, it is necessary to use the parameters properly according to the mode being used.

- Gray-Scott

``c++ float feed; float kill; float Du; float Dv;

- FitzHugh-Nagumo

c++ float a0; float a1; float epsilon; float delta; float k1; float k2; float k3;

- Belousov-Zhabotinsky

c++ float alpha; float beta; float gamma; `

Extension

Examples > example_mesh

Values, concentration of substances, are stored in FBO(texture) and they are represented as RGB in texture in ofxReactionDiffusion. You can get source texture by getSourceTexture`.

<img src="https://github.com/matsune/ofxReactionDiffusion/blob/master/thumbs/mesh.gif" width="500">

For example, reaction diffusion values can use for depth of VBOMesh. (See Examples > example_mesh)