3-dimensional cardiac reconstruction is carried out bycatheterizing a heart using a probe with a mapping electrode,and acquiring electrical data from respective locations inregions of interest in the heart, representing the locationsof the electrical data as a point cloud, reconstructing amodel of the heart from the point cloud, applying a set offilters to the model to produce a filtered volume, segmentingthe filtered volume to define components of the heart, andreporting the segmented filtered volume.