Hi,

the Creation of User Defined Elements during Import is triggered by a few Reasons:

a) The Geomtery is BREP or Tessellation - in first Case, we sometimes can calculate the necessary Extrusion for Creating a native Allplan Element, in case Tessellation normally not. Tessellation is often created hen Using the IFC4 Reference View.
b) Some Components inside Elements cannot be natively Created - happens normally, when an Opeining is Imported, which has no native Counterpart in Allplan
c) Geometric Shapes which are not possible as native Elements in Allplan.

When you create an IFC out of Revit, best is currently 2x3 Coordination View. With the IFC4 Reference View we have Issue a), the IFC4 Design Transfer View is still not fully specified by buildingSMART yet. Or create an IFC4 out of Revit with no MVD (e.g. Allplan creates IFC4 in the Scope of the Coordination View 2x3 currently).

Now to the RVT Files: We have access to the stored Geometry in RVT. It means, that we mainly extract BREPs out of the RVT and therefore run into case a). Revit itself processes its Data before Creating an IFC, so the Quality via IFC is currently higher than via RVT. RVT Import is labeled as "Technical Preview", it is still under Development.

Bye
Thomas

HI,

I HAVE THE SAME PROBLEM WHEN IMPORTING THE ARMOR OF AN IFC GENERATED WITH REVIT, TWO PROBLEMS OCCUR:

1. AN IFC OF 315MB WHEN I IMPORT IT INTO ALLPLAN I GET AN ERROR THAT THERE IS NOT ENOUGH MEMORY IN THE FILE TO IMPORT IT AND I HAVE THE DOCSIZE AT 2048MB
2. MANY BARS ARE IMPORTED AS USER-DEFINED ARCHITECTURAL ELEMENTS.

THE IFC IS 2X3, THEREFORE THERE SHOULD BE NO PROBLEMS, WHAT SOLUTION IS THERE FOR THIS?

Hi,

it depends on the geometry model used in IFC, how the bars are imported. If they are BREP geometry or tessellated (described by the faces), they will be transformed to user defined architectural objects and consume quite significant data size. I expect this in your IFC file.

If the bars are disk-swept-solids geometry (described by crosssection and path), we can create real bars in Allplan.

So this is the first thing you should check. If you have BREP, then please ask the Revit users to export the bars as extrusion geometry (disk-swept-solid).

Bye
Tom