The simulation includes two core implementations (and respective node-groups): reaction_diffusion_sim and gray_scott_sim (premium version only). The first is a general simplistic implementation of the RD model, relying on a single substance and basic image processing logic. The second implements the Gray-Scott model, where two different substances interact with each other (see theory here). Multiple presets for the latter are also provided.
While the above will return the raw results of the simulation, we also provide some utilities to visualise and render the results. RD 2D Renderer gives the control to use the sim results for plane displacement and shader control. RD Volume Renderer (premium version only) allows instead to render results as volume or full 3D mesh.
The sim resolution depends on the resolution of the target mesh. A higher face count gives more details but requires more computation.
Sim Parameters
For the Reaction Diffusion node-tree, we exposed the most relevant parameters to play with, but you can simply edit manually the values of the core simulation group (e.g. reaction_diffusion_sim) to explore the full range of results.
Sim Substeps controls how many steps are run in a frame. The higher, and the faster the simulation will run, while requiring more time to be computed.
For reaction_diffusion_sim we suggest the following ranges:
Mul 1 Value: from 1.1 to 1.9
Blur 2 Iter : from 2 to 10. Higher values allows for faster diffusion, but require more computation
Mul 2 Value: from 2.9 to 3.4
Filename:reaction_diffusion_gn_basic vfxMed.rar – 325 KB
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