Xu, ChenRushmeier, HollyAlessandro Artusi and Morwena Joly and Genevieve Lucet and Denis Pitzalis and Alejandro Ribes2014-02-012014-02-012010978-3-905673-76-0https://doi.org/10.2312/PE/VAST/VAST10S/001-004Three dimensional scanners can be used to create models of architectural spaces. The resulting models often have missing elements because it is impossible to place the scanner in positions to view all surfaces.Missing elements can be modeled by simplified shapes derived from drawings or sparse linear measurements. Furthermore, in architecture spaces, there are often multiple instances of objects that can be combined to improve the objectmodel. We build on previous work to representmodels abstractly as graphs of relationships between primitive shapes such as planes, cylinders, and spheres.We present an automatic approach to search for incomplete instances of objects using abstract shape representations of both simple models and of the large detailed point cloud. The simple models can be used to fill in the missing objects, and the partially scanned portions of multiple object instances can be combined to refine the model. We demonstrate this approach on a 3D scan of a historic synagogue.