Thanks, I’ve realized that the issue may be related to importing the dwg rather than exporting. The original export opens fine in DWG trueview.
I’ve also experienced this issue frequently when importing DWGs which have been exported by various other consultants on my project team (landscaping etc). I’ve tried changing my file from mm to m prior to importing but i’m still having the same error - a pop-up informing me than ‘‘An Invalid polysurface was read. Would you like to salvage as much as possible of invalid polsurfaces?’’. The same models open fine in DWG trueview.
The result is a context model in rhino which has many strange rectangular caps over various objects. Unfortunately as we’re using geolocated models, our origins are often extremely far away.
Is there anything that can be done to work around this? I am finding myself often unable to import DWGs from other consultants into rhino.