Revit API - Import Instance Query

Revit
,
1

Hi all,
does anyone in here know if the Import Instance Query functionality is exposed in the Revit API? Couldn’t find it at first searchthrough… I’m especially interested in exposing the Layer/Level functionality. Or even better, maybe someone has created nodes of it? :slight_smile:

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2

This is how I think it works:

  • Each dwg is imported as it’s own category
  • Each layer in the dwg is a subcategory

To find the layer names you can do something like this:

blob.jpg779×400 130 KB

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3

Nice one, Einar! It seems to be extracting all the layers from the DWG rather than the ones in use, and ultimately I want to categorize element geometries by their layer. I’ll post my eventual findings here. For now I’ll mark your response as solution. :slight_smile:

4

Hi Jostein!

Did you find out how to categorize the element geometries by their layer? I am working on the same thing.

5

One can categorize element geometries by their layer by using GraphicsStyleId property of GeometryObject class.
From GraphicsStyleId one can get corresponding GraphicsStyle graphicStyle = doc.GetElement(geoObj2.GraphicsStyleId) as GraphicsStyle;
Layer name is equal to GraphicsStyleCategory name of GraphcsStyle.

Below is an example written in C#:

Document doc = this.ActiveUIDocument.Document;

FilteredElementCollector collector = new FilteredElementCollector(doc).OfClass(typeof(ImportInstance)).WhereElementIsNotElementType();
ImportInstance importInst = collector.FirstElement() as ImportInstance;

Options op = doc.Application.Create.NewGeometryOptions();
op.ComputeReferences = true;
op.IncludeNonVisibleObjects = true;

GeometryElement geoElem1 = importInst.get_Geometry(op);

if (geoElem1 != null)
{
foreach(GeometryObject geoObj1 in geoElem1)
{

GeometryInstance geoInst = geoObj1 as GeometryInstance;
                    
if(geoInst!=null)
{        	            

GeometryElement geoElem2 = geoInst.GetInstanceGeometry() as GeometryElement;
                       	
if(geoElem2!=null)
{                        	
foreach(GeometryObject geoObj2 in geoElem2)
{
if(geoObj2.GraphicsStyleId == ElementId.InvalidElementId) continue;
                            	
GraphicsStyle graphicStyle = doc.GetElement(geoObj2.GraphicsStyleId) as GraphicsStyle;
                            	
if(!layerNames.Contains(graphicStyle.GraphicsStyleCategory.Name)) continue;
                            	
if(geoObj2 is Line) lines.Add(geoObj2 as Line);

if(geoObj2 is PolyLine)polyLines.Add(geoObj2 as PolyLine);
                                
}
                           
}
}
}
}
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