|Definition:||True if there is a certain number of agents adjacent to me. Only check the eight agents immediately adjacent to me.|
layer: which layer to search for the target agent
nextTo (>=, 2, ghost) means: are there 2 or more ghosts immediatly adjacent to me?
The Particle agent in the Accretion 3D project checks if it is next to at least one stationery Particle in the same layer or in the layers above (+1) or below (-1). If so, it changes itself to be a stationery Particle, increments a count and maps its color to a shade, based on the current count of stationery particles.