Hello
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