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.