I received an .ifc file and linked it in Revit 2015 with UR3. This is the first time I played with this functionality and noticed that an .rvt file was created, but the Manage Links dialog did not show it as being linked. I tried to open it, but Revit said this file was already linked so it had to unload it, so somehow there is some sleight of hand happening in the background to make this IFC linking possible.
Anyway, view regeneration performance is very poor and this is a small model (my machine is more than adequately spec'd). So I opened the resulting .rvt file and noticed that performance within that file is great, so I'm not sure why there is such degradation in the linked version. I also noticed that Revit created this file from my default template, which I don't necessarily like (I think it should create a new file from no template). So I tried doing a Purge All unused and it deleted IFC elements without warning! I noticed at least Doors, Windows, Lighting Fixtures, Specialty Equipment and Generic Models got deleted, but there could be other categories that would have been deleted but were not part of this model. Walls, Ceilings, Structural Framing, Structural Columns and Furniture did not delete. I would have never expected this to happen.
Is this something that should be reported to Autodesk? Thanks.
David Baldacchino - HOK
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When you link an IFC file, there is a cached Revit file created. This is because we don't (no one does) really have IFC items as native Revit objects - we translate them into Revit objects, but maintain the associativity to the original IFC file. As such, we put the IFC file in the "IFC" tab of Manage Links, instead of putting the generated ".ifc.RVT" file in the "Revit" tab of Manage Links. Of course, we don't prevent you from looking at this file, and there could be reasons you'd want to use this file to "break" the associativity with the IFC file, but in general it is intended to be left alone.
I don't know about the performance issues, there may be something specific to that small model. If you share it with us, we can examine.
Revit files must always be created from some template. That said, You can use the Revit > Open > IFC Options to change which template it uses. You can set IFC to use a very bare template, or any template of your choosing.
Purge all unused should not have deleted IFC elements. Again, if you send us your file, we can investigate that.
Thanks for your feedback!
Regards,
Angel
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I'm also getting some strange results. Files are from MagiCAD.
1. On linking, the the import table is not used and all objects are put into Generic. Tested creating a duct and a wall in RVT -> export to IFC -> link into a new project -> IFC converted to RVT duct and wall -> link MagiCAD file into same project -> ducts (and everything else) converted to Generic. Same goes for all other MEP from MagiCAD.
2. Same file. IFC link created from RVT, I can snap and measure. IFC link from MagiCAD, no dice.
Regards,
Troels
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It would be good to get these files, so we can examine them more closely. Here are some comments:
1. What do you mean by "Generic"? Generic Models? Usually it should go to the right category.
2. When we import (open or link), we can create a Solid or a Mesh. We create a Solid if it meets the requirements (e.g., vertices not too close to one another, not too many of them, sews into a solid), otherwise we have to create a Mesh (more compact representation, no snapping or measuring). Looking at the files may reveal why the data couldn't be converted to Solids.
Regards,
Angel
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Hi,
I received an .ifc file and linked it in Revit 2015 with UR3. This is the first time I played with this functionality and noticed that an .rvt file was created, but the Manage Links dialog did not show it as being linked. I tried to open it, but Revit said this file was already linked so it had to unload it, so somehow there is some sleight of hand happening in the background to make this IFC linking possible.
Anyway, view regeneration performance is very poor and this is a small model (my machine is more than adequately spec'd). So I opened the resulting .rvt file and noticed that performance within that file is great, so I'm not sure why there is such degradation in the linked version. I also noticed that Revit created this file from my default template, which I don't necessarily like (I think it should create a new file from no template). So I tried doing a Purge All unused and it deleted IFC elements without warning! I noticed at least Doors, Windows, Lighting Fixtures, Specialty Equipment and Generic Models got deleted, but there could be other categories that would have been deleted but were not part of this model. Walls, Ceilings, Structural Framing, Structural Columns and Furniture did not delete. I would have never expected this to happen.
Is this something that should be reported to Autodesk? Thanks.
David Baldacchino - HOK
Hi David,
There are a number of issues here, and I am going to parse them, and reply shortly.
Regards,
Angel
Hi David,
OK, let me try to go through the items.
Thanks for your feedback!
Regards,
Angel
I've just had the same issue. Purge deletes IFC objects. See attached before and after screen shots.
Hi,
Could you send that file? I'd like to see if this is specific to some cases or a generic issue.
Thanks
Angel
Hi,
I'm also getting some strange results. Files are from MagiCAD.
1. On linking, the the import table is not used and all objects are put into Generic. Tested creating a duct and a wall in RVT -> export to IFC -> link into a new project -> IFC converted to RVT duct and wall -> link MagiCAD file into same project -> ducts (and everything else) converted to Generic. Same goes for all other MEP from MagiCAD.
2. Same file. IFC link created from RVT, I can snap and measure. IFC link from MagiCAD, no dice.
Regards,
Troels
Hi Troels,
It would be good to get these files, so we can examine them more closely. Here are some comments:
1. What do you mean by "Generic"? Generic Models? Usually it should go to the right category.
2. When we import (open or link), we can create a Solid or a Mesh. We create a Solid if it meets the requirements (e.g., vertices not too close to one another, not too many of them, sews into a solid), otherwise we have to create a Mesh (more compact representation, no snapping or measuring). Looking at the files may reveal why the data couldn't be converted to Solids.
Regards,
Angel