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Forums >> Revit Building >> Technical Support >> Importing Autocad background - Revit Model to exceede 2 miles across
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Joined: Wed, Feb 11, 2009
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I am using Revit Architecture 2010, and trying to either import or link (neither work) an AutoCad site plan as a background. The following warning appears: "Cannot import file because it will create a revit model that is larger than 2 miles across. This can cause inaccuracies and instabilities. Either select a different import units setting or adjust the project size before importing." Can anyone help?
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Joined: Tue, May 16, 2006
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Obviously, your two files do not have the same origins. Don't place automatically - use the positioning - manual - center when you import the cad - then adjust where it is after import.
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The warning appears before I am allowed to insert the file, whether it be automatic positioning or manual. Being that that AutoCAD file is a civil plan, it is generated in decimal units. Revit does allow me to link/import if I select inches as the units, but then the information is reduced by a factor of 12. If I could scale the AutoCAD information up by 12 in Revit, the problem may be solved. Is there a scale command in Revit?
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When you import, you can set the import units .... including custom. If your file is so large, perhaps you shold wbock out a piece of it in CAD.
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The custom scale option in the import/link dialogue box does not help me, because the only way I can get the AutoCAD file into the Revit file is if it is inserted as inches. I would need to scale the AutoCAD information after it has been inserted into the Revit file. I cannot wblock anything out, as all the information is required.
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I know I'm working with only half the information I need so I'm backing out of this. Either you are not doing as suggested or you are not telling us everything. I doubt your site is more than two miles across. You say the autoCAD file is decimal feet - then feet (not inches) should be your import units and positioning should be manual center. If your drawing is super huge and your site is only a tiny portion, then you should look at reducing that file size.
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Relax guy. The site I am working on is a touch under a mile, which was the reasoning for this post. If you re-read the initial post, you will see that it is the Revit warning that is indicating that the file exceeds 2 miles across. The AutoCAD file has been purged and audited and all layers are on, so there is nothing floating out in space that would make the file appear larger. I am aware that the correct units would be feet and I am also aware that only the portion of the site that is relevant should be imported, but thanks for the insightful advice. I have corresponded to other architects who have indicated that they have had similar problems. As you have been given all of the information, I think it is best that you do "back out of this."
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i am with you on this apanico i have the same problem and im getting frustrated because i have scaled it the same as i have for the last 5 years and it doesnt work in 2010. i opened an 2009 file and imported the same autocad file, the same scale in rivet everything the same and guess what it worked so it has to be a problem with 2010. i need this sorted out fast as i do all my drawings for clients importing cad survey plans then making 3d topos. can anyone help?
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i managed to find a work around that works good enough for me (for the moment) i opened 2009 and made a new drafting view imported the survey (acad) plan save the view then opened my drawing in 2010 and inserted the view the copied the survey plan to my site plan. its only able to insert as current view but i can just pick points to make my topo. not sure if that help you but fingers crossed  ............... HOLD UP even better sorry you can do a better one then that if you want to be able to do a 3d topo. start with a 2009 drawing again. i imported the survey plan in the FLOOR plan twice in current view only and current view unticked, then turned everything off so it was just the 2 survey plans showing, the saved that flor plan view, opened it in 2009 the purged it to make sure that was all i was taking to 2010 project. so now open your 2010 project, the i just open the 2 survey plan view then copied then both into the project..... done you should be able to make a 3d topo and have a currnet view one to work with.... hope this can help you for now let me know
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Before you import any Civil file its always a good idea to open it in AutoCAD first and do a little tidy up... In 2009 there was still an issue whereby although it would allow you to import it, you would start getting weird things happening when trying to snap and draw lines etc. The highlight position of where the line is going to be drawn would not be the same place as you picked on the screen. Basically this occurs because the numbers for the coordinates are truncated. So the solution... Open the Civil File. Select all the visible information, then copy and paste to a new file at 0,0,0. OR simply move the WCS to a central location that would allow the entire site to fit in a 2 mile diameter circle. Purge the file, then import into Revit. If you still experience issued you may need to explode some blocks first and then repeat the copy/past process.
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im still confused on why i can import the exact same cad file into revit 2009 but not into 2010they would have to had messed something up. even when i scaled it up in autocad say 100 it will import but its not the right size then again at 200 and then 300 but as soon as its scaled up 400 it comes up with the message when importing to revit. so it brings me back to 2009 and 2010 importing once i scale it 1000 2009 works like a treat and 2010 frustrates me haha...
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Simplified: Revit 2009 - Yes it would import but would cause weird anomalies Revit 2010 - Prevents weird anomalies by forcing you to fix the issue in advance.
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I had the same issue with a dwg of a building (no civil). I solved it by exploding everything and then purging and then I was able to import it.
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O.k. I am having a strugle with this one.... Mr. Spot does this mean you cant import anything bigger than two miles radius? I am slightly confused with this post....
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This problem is addressed in the premier issue AUGI/AEC EDGE. DWG improrts with coordinates (before scaling) longer than 10 digits may be truncated to 0 and become corrupt. They also say that entities furtur than 2 miles apart (after scaling) may cause accuracy issues and are not allowed. The solution - subdivide into smaller files.
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