Occasionally a site may become corrupt and cause a drawing to become unstable. If the feature lines are utilized to create a surface it is possible to get the feature lines back if the bak file or last backup of the drawing isn’t available. To start export the surface to XML. Then open another file and import the XML surface, making sure to import the Source Data.
This will bring in the feature lines as 3D polylines which may be converted back into feature lines and if necessary fitting curves to the feature lines. While not ideal, it can save some work by recovering some of the work that happened before the drawing became unstable.
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