Dealing w/system boundaries in Voronoi calculations & assigning radii to pseudo-water

I’m analyzing protein structures (specifically, I’m performing a Voronoi-based analysis) using the tools linked on the geometry page:

I understand that the bisection of distances between atoms means that the radius does not matter. However, what happens at the boundary of the system?

Also, if you add ‘pseudo-water’ to the system, then do the water atoms need to have a particular radius? If not, then is there a distance cutoff?

With respect to your first question (regarding the boundary of the system — ie the protein surface): the Voronoi volumes become large and potentially infinite. That’s why you need to introduce solvent. A course lecture may help to further explain this nicely:

With respect to your second question (regarding the radius assigned to water): Yes, the water atoms most definitely need to have a particular radius. Distance cutoffs won’t work. You can probably use the normal water radius here.

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