1. A method for optically scanning and measuring a scene by a three-dimensional (3D) measurement device in which multiple scans are generated by the device, and the multiple scans are then registered in a joint coordinate system of the scene, comprising: generating at least one cluster from at least one scan of the multiple of scans; registering additional scans from the multiple of scans for test purposes in a coordinate system of the generated at least one cluster; confirming the registering of the additional scans if specified quality criteria are fulfilled; and joining clusters generated from the additional scans by selecting at least two clusters and registering the at least two clusters for test purposes and confirming the registering, wherein the clusters to be joined are visualized for supporting user selection of the at least two clusters.