Import of IFC from Revit

[Anonymous]

I'm having to work with a series of imported IFC's from Revit . They are about 35meg each and are appallingly slow in AC19. I'm quit unfamiliar with IFC's generated by others. Is there something I should tell them to do to their file before exporting?
Rob

[Erika Epstein]

Are you needing to edit them or just reference them?
If reference, in 2d and/or3d?

[Anonymous]

Hi Erica,
Mostly 3d work....soooo slow to orbit or zoom.

[Anonymous]

Robert,
Are you editing the imported IFC or just referencing it?
I have found that some Revit IFCs very heavy with polygons, in both 2D and 3D, Revit families are converted to library parts which are heavily triangulated and not at all optimised. I usually swap out converted parts with native ARCHICAD parts and this significantly improves performance

Scott

[Anonymous]

Hi Scott,
I think your right, on closer inspection they included all the loose furniture and other junk (hotel project) that I don't need, only working on the base building envelope...thanks.

Rob

[Laszlo Nagy]

You should ask the Revit guys to export to IFC only certain Categories or certain Families. Hopefully they can make such filtering of elements before saving as IFC. Then you could have IFC files that contain only the information you actually need.
Then you can make agreements with them to always send you IFC files in that specific way. It is a matter of working out the most optimal file exchange procedures.