1. A method comprising: determining a location of each of a plurality of electrodes distributed on a torso of a patient; projecting, with a processing unit, the locations of the plurality of electrodes onto a surface of a model torso; receiving, by the processing unit, a torso-surface potential signal sensed by each of the plurality of electrodes; projecting, by the processing unit, each of the torso-surface potential signals onto a respective location on the surface of the model torso based on the determined locations of the electrodes; and determining, by the processing unit, a set of cardiac activation times for a model heart within the model torso based on the projected torso-surface potential signals and a location of the model heart within the model torso.