Use case TK01: Aggregation of disjoint geometries

[aothms]

Typically the spaces of an IFC building model are separated by the physical elements bounding them. Still it would be useful to aggregate space geometries as if they were touching. This could be accomplished by dilating the geometries with a 3D Minkowski sum, then union the geometries, then apply the reverse to erode the geometries.

This is something proposed in: Donkers, S., Ledoux, H., Zhao, J., & Stoter, J. (2016). Automatic conversion of IFC datasets to geometrically and semantically correct CityGML LOD3 buildings. Transactions in GIS, 20(4), 547-569.

Also in the r'dam space hierarchy service, but in that case not a Minkowski sum is used, but rather, the volume is decomposed into halfspaces and the plane equations of the halfspaces are averaged to come to an aligned volume prior to the union.

[ar-chad]

Hi @aothms! It would be great, if you could to add function signatures to submitted use cases.

[ar-chad]

@aothms the authors of Automatic conversion of IFC datasets to geometrically and semantically correct CityGML LOD3 buildings write "We have implemented our algorithm in C++ and the code is freely available under an open-source licence"

However, when I try to open https://github.com/tudelft3difc2citygml I see 404 error.

Do you happen to know how to obtain this open-source code?

[ar-chad]

For the reference, the correct link is: https://github.com/tudelft3d/ifc2citygml The / was missing in one of the footnotes.