Thursday, April 08, 2010

What Happens to Revit Graphics Overrides when you export to CAD (.DWG)?

What happens to overrides when you export to a .DWG file? Have you ever wondered how to control this?

So, you have a Revit project where you've overridden some objects using "Override Graphics in View > By Element…











When you export to a .DWG, you have the following options under DWG Properties that will give you some control of the conversion to .DWG process.















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When a Revit element with view-specific graphics is exported, in AutoCAD those differences (overrides) are applied to the individual entity, but the entity resides on the same layer as other entities in the same Revit category or AutoCAD layer.


Notice that all the walls are on the A-WALL layer and overrides are made to the color and linetype (highlighted yellow). Note that there is no change to the halftone override.




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When a Revit element with view-specific graphics is exported, in AutoCAD those differences (overrides) are ignored. The entity resides on the same layer as other entities in the same Revit category or AutoCAD layer, and it loses its unique attributes. This option forces all entities to follow visual properties as defined by their layer. It produces the least number of layers and provides by-layer control over the exported DWG file.


All Revit overrides are lost… Notice how all objects are on the same layer and color andd linetype are set to Bylayer.







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When a Revit element with view-specific graphics is exported, in AutoCAD the entity is placed on its own layer. This option provides by-layer control over the exported DWG file, and preserves graphical intent. However, it increases the number of layers in the exported DWG file.


As you can see below, each object with a Revit override is placed on its own layer (with the exception of the halftone override).