A method for mapping a body organ, including receiving a three-dimensional (3D) map of the body organ having a multiplicity of map elements, each map element having a graphic attribute indicative of a local property of the body organ. The method further includes delineating a selected region of the map, so that the map is divided into the selected region and a non-selected region. The 3D map is displayed while the graphic attribute of the map elements specifically within the selected region are altered.
