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physarum: mesmerizing interactive particle simulation

this module uses the glsl shaders from Bleuje's github under: Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License

this is based on a simulation detailed in the paper Characteristics of Pattern Formation and Evolution in Approximations of Physarum Transport Networks, Jeff Jones, Artificial Life 16: 127–153 (2010)

and also there is a nice video explaining the context, by Sebastian Lague

it is also possible to connect a mask channel for interesting effects:

parameters

• back the parameter space point index for the background
• cursor the parameter space point index for the cursor area
• colour which colour scheme to use
• wave interactive simulation allows to fire waves through the particle system

connectors

• output the rendered image based on coloured particle locations
• mask optional: input a grey scale image to modulate the pheromone trails