Placevent Placevent Placevent is an algorithm for automatically predicting the explicit solvent atom distribution of biomolecules using 3D-RISM. This procedure predicts optimal location of solvent molecules and ions given a rigid biomolecular structure and the solvent composition. Our results give excellent agreement with experimental structure with an average prediction error of 0.45-0.65 Å. Our method can be performed directly on 3D-RISM output within minutes.