1. INTRODUCTION
Digital reconstruction of existing buildings through Building Information Models (BIMs) is becoming a popular method to document and analyze heritage and existing buildings using reality acquisition techniques. The inherent nature and purposes of BIM approaches require the combination of fast and accurate modeling of the 3D scene (by means of point cloud modeling with photogrammetry and/or laser scanning), together with some data organization algorithms. Indeed, the acquired 3D points lack an explicit structure, and labeling process is hardly automated and time-consuming.