SketchUp Pro version 20.2.172 64-bit.
NVIDIA GeForce RTX 2070 with Max-Q
I have imported an architect’s IFC file, which they exported from Revit for me. After importing the IFC file into SketchUp, the resulting model behaves very oddly, rendering it unusable for both modelling in SketchUp and drawing production in Layout. All geometry appears to move slightly as I navigate around the environment and when viewed in plan, elevation and section. This creates linework that appears in a random pattern (see sample images). When a component is exploded down to un-grouped geometry this behaviour stops for that geometry only (see sample image), but persists with unexploded components.
I’ve experienced this issue before but never to this extent. The IFC file is fine when viewed in Trimble Connect, so I don’t think the file is corrupted. The issue happens both with a native import and using SimLab IFC Importer.
The attached sample file is a window extracted from the main model to demonstrate the behaviour. Is it possible to overcome this issue without exploding the entire model (66MB), which is not an option for workflow reasons?
The Revit IFC exporter, like all Revit exporters places the origins of the components it has created to the origin point. Either the original Revit model is rather far from the origin point or the exporter has used the geolocated “shared” coordinates instead of the more manageable project coordinates to place the component origins. I bet the latter has happened.
I have managed to remove the behaviour. The model had been imported a long way from the origin point, so I relocated it closer to 0,0,0 and reset the major component axes to 0,0,0. This didn’t solve the issue on its own so I ran Eneroth Line Up Axes. Initially, this didn’t solve the issue either but after I stripped out all extraneous elements (a few dozen pieces of unrelated architecture that had been nested incorrectly) and the ground/landscape area, I ran Eneroth Line Up Axes again and this solved the issue.
Thanks again for your advice.
I would discuss with the people who send you the IFC files about the possibility of their using the project coordinates instead of shared coordinates when exporting the IFC. In that way your project and theirs could use the same coordinates without the need to move things around. The origin in the file you originally posted is so far away that Revit cannot handle it cleanly either so I am sure that that is not the coordinates they are using in their Revit model.
Thanks Anssi. Very good of you to offer the advice. That is all in hand but moving at an apparently glacial pace outside of my organisation. I needed to work on the files urgently hence the coordinate change.