Revit IFCs: Very slow processing and Out of memory exceptions

[andyward]

Revit exporter 17.3.0.0 is outputting some IFC Geometry in a manner that's causing model processing to take hours & consume a lot of memory (resulting in crashes)

Assemblies and versions affected:

V5 Geometry v5.0.118

Minimal file to reproduce the issue:

See mp101-sw02-03-zz-a-mdi-xxxx-0100-0002.ifc provided privately by BT.

... which took 4 hours before crashing.

[SteveLockley]

This was caused by a huge polygonal mesh (representing louvres for a wall) with an opening cut into them. This is beyond the reasonable limits of Opencascade boolean operations and takes a considerable and unreasonable length of time. The operations are not really sensible, it has been trapped and a warning issued, the mesh geometry has been preserved to give some indication of location but the boolean has been aborted to allow the rest of the model to complete

[andyward]

Confirmed fixed in Geometry 5.0.216-develop.

Took 16 mins, and memory usage was reasonable.