Imported CAD Data with LayerName

grahamcook — Thu, 28 Apr 2022 17:09:07 GMT

I am importing solid geometry from dwg Imports and then using those points to generate topo’s. The simplified code that gets the points is below.

The project is experimental at the moment. The dwg’s include multiple objects other than just terrain so I need to be able to identify the “terrain” objects from the other objects. Clearly the layer name would be an ideal candidate for that. From this post I can see that a list of layers can be obtained from ImportInstance.Category.SubCategories but I’ve not managed to reconcile the items in that list with the individual geometry objects. This question was asked in 2014 and I’m wondering / hoping that its moved on and we can somehow filter the imported object by Layer?

ImportInstance dwg = MyImportInstance; foreach (GeometryObject geometryObj in dwg.get_Geometry(opt)) { if (geometryObj is GeometryInstance) { GeometryInstance dwgInstance = geometryObj as GeometryInstance; GeometryElement instanceGeometryElement = dwgInstance.GetSymbolGeometry(); foreach (GeometryObject instObj in instanceGeometryElement) { // In this case i'm only interested in Solids. // But object might be Mesh, PolyLine, Line, Arc, Etc. if (instObj is Solid) { Solid solid = instObj as Solid; if (null == solid || 0 == solid.Faces.Size || 0 == solid.Edges.Size) continue; // Get the faces and edges from solid foreach (Face face in solid.Faces) { Mesh mesh = face.Triangulate(); // get points on the mesh and process as required, put into collections, etc. } } } } }

Re: Imported CAD Data with LayerName

jeremy_tammik — Fri, 29 Apr 2022 06:26:50 GMT

I am not an expert in the Revit UI. I would hope and expect there to be some kind of option in there to assign different graphics styles to the different imported CAD layers. Then, you might be able to pick up and differentiate those different styles in your code snippet by checking the GeometryObject GraphicsStyleId property:

https://www.revitapidocs.com/2022/4103f148-957e-3f44-9ccd-a5ed6702c689.htm

Re: Imported CAD Data with LayerName

sensiblehira — Wed, 05 Feb 2025 22:48:43 GMT

Hi @grahamcook were you able to solve your problem?

Re: Imported CAD Data with LayerName

sensiblehira — Wed, 05 Feb 2025 22:49:23 GMT

I just need to filter Geometries based on Layers

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Imported CAD Data with LayerName

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