Detection of a movable object when 3d scanning a rigid object

A system for detecting a movable object in a location, when scanning a rigid object in the location by means of a 3D scanner for generating a virtual 3D model of the rigid object, wherein the system comprises:

• means for providing a first 3D representation of at least part of a surface by scanning at least part of the location;
• means for providing a second 3D representation of at least part of the surface by scanning at least part of the location;
• means for determining for the first 3D representation a first excluded volume in space where no surface can be present;
• means for determining for the second 3D representation a second excluded volume in space where no surface can be present;
• means for disregarding the portion of the surface in the first 3D representation in the generation of the virtual 3D model, if a portion of the surface in the first 3D representation is located in space in the second excluded volume, and/or
• means for disregarding the portion of the surface in the second 3D representation in the generation of the virtual 3D model, if a portion of the surface in the second 3D representation is located in space in the first excluded volume.