1. A method comprising: displaying a three-dimensional (3-D) model of a structure in a user interface on a display screen of an electronic device; providing in the 3-D model, by the electronic device, icons that each correspond to a respective two-dimensional (2-D) raster image of the structure, each icon located at a position within 3-D space of the 3-D model corresponding to a position in physical space associated with the 2-D raster image; receiving a selection of a particular icon on an input device of the electronic device; showing, in the user interface on the display screen of the electronic device, a combined view depicting at least a part of the corresponding 2-D raster image for the particular icon combined with a portion of the 3-D model, as viewed from the position within 3-D space of the 3-D model.