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It can be useful to take a configuration corresponding to one density and rescale the box and particle coordinates such that it has a different density. This is accomplished by the following lines (which also show how to get the current volume and number of particles).
nParticles = sim.GetNumberOfParticles() vol = sim.GetVolume() currentDensity = nParticles/vol sim.ScaleSystem( pow(newDensity/currentDensity, -1./3) )where
newDensity is understood to be the desired density.