One now has to analyze the 3D points with the goal of segmenting the facade into its planar sub-facades. An initial method to accomplish this moves through the vertical columns of the facade and adds up the point counts. A facade row is found if the point count is high. The color line segments along the foot of the building in Figure 18 illustrate the result of such an approach. Figure 19 adds to each sub-facade the photo-texture and visually confirms that the building facade has successfully been segmented for a floor and window count within each plane. We find the existence of four floors and 19 windows, a result that was not possible using the previous 2D method.