The construction sector encompasses diverse disciplines, each operating on a unique perspective on the geometrical nature of built structures. This diversity often hampers effective information exchange within Building Information Modeling (BIM).

At the same time, it's worth noting that open-source CAD/CAM has limited options when it comes to available geometry libraries. In the latest version of IfcOpenShell, a combination of OpenCASCADE and CGAL is used to realize the best of both worlds in terms of performance, expressiveness and robustness. The presenter also uses voxelization and trees of halfspaces to cater to specific requirements.

This presentation describes challenges by various disciplines in the construction sector and explores solutions by leveraging a diverse ecosystem of open-source geometry libraries and discusses the benefits and challenges of a hybrid usage of geometry libraries.