How Revit identify the shared coordinates between Revit and DWG file. What Revit will do when we publish the coordinates from Revit to DWG.

[zepeng.zhao]

I can see when we publish shared coordinates from Revit to DWG, that DWG will have one new UCS being added but not sure what if we have manually simulate this process like manually setup\match the shared coordinates for DWG file for Revit DWG link.

[zepeng.zhao]

Hi, is there anyone have any information or idea about this?

[RPTHOMAS108 · Accepted solution]

DWG is using a combination of UCS and INSBASE to represent the location of the survey point.

When you move the survey point clipped then you are moving the UCS origin.

When you move the survey point unclipped you are altering the value of INSBASE and keeping UCS origin the same.

However location alone is not enough to tell Revit that DWG shares same system. Revit adds something else to the dwg when position is saved back to it.

Link a DWG File and Use Shared Coordinates | Revit 2018 | Autodesk Knowledge Network

It is often the case that position originates in dwg from Civil 3D and Revit acquires coordinates from that.

The history of INSBASE was that it was always used to define the insertion of the current dwg as a block into other dwgs.