Positioning of linked dwg

[aleksei.tkachenko]

Hello

I’m struggling with positioning of linked dwg. I know that my Revit project and dwg that I’m trying to link share the same coordinates. But when I’m using shared coordinates for linking dwg to Revit, I receive a message: “Imported objects located a large distance from the model might not display properly. The "Center-to-Center" option will be used.” See my screencast.

I’m aware that there are workaround when you move dwg in Revit manually, but I want to learn how to link dwg properly so that I do not have to change dwg or move it in Revit. Does anybody know how to do it properly?

[RDAOU]

Hello @aleksei.tkachenko

Two things to ask then comes the clarification 

• From your screencast, it shows that the dwg has already been linked once before into the project. The question is, when u linked it the first time did you position it properly in revit (to where it should be) then published the coordinates to the CAD? (Or viseversa did you acquire the coordinates from the degree?)

.... If you neither published or acquired coordinates before then the two files do not share the same coordinate system and you can't use Auto-By Shared Coordinates option

• second question, if the dwg has been previously linked and you already have an instance of it in the Revit host model, what is the purpose of linking a second instance? Why not reload the already existing one?

.... The reason I ask is that there might be a chance that the CS in the dwg might have been modified by someone other than u who has access to it (mistakes happen and in such case the coordinates need to be republished to the CAD to fix it or better say realign them) or the surveyor revised his survey and in such case the CS need to be reset either from the revit published to the dwg or acquired from the dwg (the latter happens when the surveyor revises something or when the location of the site has been changed)

• third question, while you were in the process of setting out your project in revit (I can see the project base point and the survey point are not in their original location) you DID NOT move/tamper with the Start UP origin???? Or did you?

.... Asking because one needs to consider the fact that the project base point may not be un-clipped and relocated further than 10 miles (best <8 miles) away from the Start UP origin. (The start up origin is invisible and it is not the survey point) if this happened you would continue to receive that error (too far from project origin) even if coordinates are shared

PS: best practice is to have the site on a separate revit model and the u link ur revit building model into the revit site model (but first we try solve ur issue before getting into this)

Sorry for any typos; I am using my mobile

[RDAOU]

This couldn't have solved itself so you must have decided to let someone else in the office worry about this one? LoL

[aleksei.tkachenko]

I'm sorry for late reply. This dwg was previously linked. But when I did it first time I faced the same problem. Coordinates in my model was acquired from architectural model, and they are the same as in linked dwg. Project base point lays close to the building, but survey point is 7 653 kilometers far from the base point.
As far as i understand, when you got your survey point outside this radius of 10 miles, you will never have right position of dwg. So I placed it manually. I gave up:(

[RDAOU]

Hmmm! Interesting conclusion 🙂

BUT there is nothing which is can't be resolved. Anyhow; if you are happy with the moving survey point then all is good.

The issue however isn't the survey point it is the start up origin...just for you to have an idea what it is follow the stops below then undo them so that you restore the model to where you left it

1. Unclip Project base point
2. Select the project base point and right click it
3. Click "Move to start up location"

That point is where your building should have been modeled...and the limit from that point is 9.8 miles radius. You shouldn't unclip project base point and move it away from that point more than 10miles...is it fixable? Yes; not super easy for someone doing it for the first time but doable...

Now you can undo and continue from where you left 🙂

Sent from my iPhone