Because these objects are not standard CAD entities, other programs besides the one in which they were created may not know how to display, modify, and/or interact with them. Some programs use special objects that are not standard CAD entities to add extra functionality to specific objects drawn in that program. On opening that drawing, you probably see a message about "Proxy entities" being detected. For example, surface models created in AutoCAD Civil 3D may contain special Contour entities which look fine in Civil 3D but do not appear when the drawing is opened in EmbeddCAD or InCAD. Some drawings (especially those created in programs like LDD, Civil, Civil 3D, AutoCAD Architecture, etc) can contain objects that do not display when opened in other programs. Posted by Kai Yang on 01 December 2022 09:57 AM
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