Fun with Reaction-Diffusion in Houdini | Dan Wills | SIGGRAPH Asia 2019

Reaction-Diffusion is a fascinating type of simulation in which the the concentrations of multiple diffusing chemical species in a reaction is simulated spatially, for example on a pixel or voxel array. It also can be made to work on poly-meshes and poly-wires over edge-connectivity, or even just on points in space. The values representing the chemicals are then updated according to one of many different formulae that each have their own different kinds of dynamics. Dan’s work has focused on a formula called ‘Gray-Scott’, which he extended in several ways and discovered some very interesting things. He also wrote an experimental formula based on a tweaked classical 2D ‘Orbits’ fractal step – which led to many interesting results!

In his day-job Dan Wills builds visual-effects pipelines and works on complex effects tasks for Rising Sun Pictures (RSP). He teaches groups of students to use Houdini as an instructor for RSP Education. In the time between caring for a young family, Dan is a fractal explorer, a reaction-diffusion experimenter, and an incessant Houdini workflow-tinkerer and improver.

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