Regular patterns of repeated elements in CAD assembly model retrieval

A multitude of online repositories and a large amount of specific CAD model databases are currently
available. Therefore, it is crucial to have access to these data in an easy and in a multi-perspective
manner according to multiple access keys, not only in terms of annotation data or shape similarity,
but also in terms of specific characteristics. In this perspective, this paper proposes a multi-level
approach forCADassembly model retrieval, which exploits assembly specific information related not
only to the shape of the constituting components but also to peculiar assembly information, such as
kinematic joints and component arrangements. In many cases, most of this information is not explicitly
stored, thus tools for its extraction must be provided. In this paper, we focus on the detection of
regular patterns of repeated elements in CAD assemblies and on their exploitation for the browsing
and retrieval of assembly models