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Link a georeferenced dwg file correctly with object snaps

Link a georeferenced dwg file correctly with object snaps

Here are problems I have every day when I start a new project in revit:

- First I link a georeferenced dwg file (with real coordinates far from the intern origin) in revit to use it to import shared coordinates and I put the dwg near the intern origin. Then it's impossible to have objects snaps, no matter the option of the link I use. 

- Then I open a dwg file in Autocad before linking in revit to check some topics as coordinates, true North, ....  I use the command "zoom to fit all in view" to see if there are objects very far from the other. If there aren't, I link this file in Revit and I don't have the same results when I use the command "zoom to fit all in view": some objects are very far so that I can't see anything.

I don't have the same problems with dwg files when I use other software so it really necessary to have a perfect compatibility between these 2 autodesk products.

5 Comentarios
samuelsanf
Advisor

Hello @j.rodeschini Did you try link it "Auto - Center to Center" or "Manual - Center"?

 

If you use the optons "Auto - Origin to Internal Origin", "Manual - Origin" or "Auto - by Shared Coordinates" Revit will place the CAD far from the Revit internal Origin and that comes with distorted lines at visualization/snap problems, never do that with real coordinates.

Simon_Weel
Advisor

There is no good argument for doing this :cara_con_una_leve_sonrisa:
Dwg files used to acquire coordinates should alwas be linked Center to center. Then maby moved a little and rotated.

Then you acquire coordinates. Origin and base point stays near the building and if you place survey point in N/S 0.0; E/W 0.0; Elev 0.0 you are able to export to any other application in coordinates.

Tekla is the only program having trouble working with coordinates acquired from a dwg.

The only reason Autodesk opened the limit from 7,5 to 32 km from origin is that no one understands this.

The furter you get from Origin the more inacuate the model gets. 

Tips: Always make sure the dwg has a geographical stamp from civil, dwg units are meters/Inches (Then you avoid flacking lines) and make sure the dwg has a limit so you can Zoom All without the building desapears.
AutoCAD and Revit are working in 2 different ways, but they do work great together despite this.

j.rodeschini
Enthusiast

Thank you for your different replies.

 

@samuelsanf : you're right, I don't use these 3 options because it doesn't work for a dwg with real coordinates.

I tried "Manual-Center" and put the cad file near the internal origin but lines were distorded.

 

@Simon_Weel : the distance limit from internal origin in revit isn't a problem for me because I used to work near the internal origin. The way to work with relative coordinates and real coordinates works well so I don't need to work far from the internal origin.

 

@samuelsanf and @ViviNyehuusAndersen : I've already used the "Auto - Center to center" option but:

- in case of an update of the cad file, the center won't be the same as the old version. Will the file stay at the same position no matter we moved or didn't move it after the first time we linked it?

- sometimes I have some difference when using "zoom all" in Autocad and Revit. It can be ok in Autocad (any elements far from the project) but not in Revit whereas it's the same file (all layers visible). And I can't modify the cad file because I can't see the elements which are far from the project. That's why I tried the "Manual - Center" option to link the cad and put it directly near the internal origin

- I have to unpin the file to move it and then to pin again. It's not a big problem but the "Manual - Center" is more practical.

samuelsanf
Advisor

@j.rodeschini  wrote:

...

I tried "Manual-Center" and put the cad file near the internal origin but lines were distorded.

...



Hi @j.rodeschini, Maybe there are frozen layers in AutoCAD that extend to the view, perhaps bocks with it insertion point far from the block lines, Dynamics blocks, proxy elements from Civil 3D (ACAD Architecture or MAP 3D). Try to full explode a copy of the CAD file and insert it into Revit to see if get distorted.

 


@j.rodeschini  wrote:
...
: I've already used the "Auto - Center to center" option but:

- in case of an update of the cad file, the center won't be the same as the old version. Will the file stay at the same position no matter we moved or didn't move it after the first time we linked it?

...


After update the CAD file, the position of the CAD drawing on Revit do not change. This placement option is only for the time is inseted. But it does not affect it in the future.

 

Any way, after you acquire coordinate you should dissable shared position from the CAD file: otherwise; every time you save/synchronize the revit file, Revit will save back rotation changes on the CAD (overrides the CAD North with Revit Project North) and then when you will have both, the Revit and CAD, coordinates turned into a mess. Is a very irritating problem I notice since Revit 2017.

 

@j.rodeschini  wrote:

...

- sometimes I have some difference when using "zoom all" in Autocad and Revit. It can be ok in Autocad (any elements far from the project) but not in Revit whereas it's the same file (all layers visible). And I can't modify the cad file because I can't see the elements which are far from the project. That's why I tried the "Manual - Center" option to link the cad and put it directly near the internal origin.

...

 

As I mention above, maybe some frozen/turned-off layers or blocks with insertion poins far from the block itself.

 


@j.rodeschini wrote:

...

- I have to unpin the file to move it and then to pin again. It's not a big problem but the "Manual - Center" is more practical.


"Manual - Center" is also the best one for me.

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