DWG Layers (Import Instance)

Revit API
1

Hi I would like to know if anyone has been able to retrieve import instance layers. I am creating a task dialog for the user to input the layer name and then I would check if it exists. Any help is appreciated. Many thanks

# Step 1: Prompt user to select a dwg file
picked = uidoc.Selection.PickObject(ObjectType.Element, "Select DWG file")
dwg_import_instance = doc.GetElement(picked.ElementId)

# Step 2: Prompt user to enter name of AutoCAD layer
result = forms.ask_for_string(prompt="Enter Layer Name:", title="Layer Name")

if result:
    layer_name = result
else:
    TaskDialog.Show("Result", "The form was cancelled.")
    sys.exit()
2

Found a solution if someone encounters this might be useful.

gStyle = doc.GetElement(geometry_object.GraphicsStyleId)
                if gStyle.GraphicsStyleCategory.Name == layer_name:
3

Also all ImportInstance has it’s own custom Category, where all Sub-categories are the Layers of the DWG

kép
kép2679×1195 247 KB

1 Like
4

I tried initially getting it through the SubCategories but couldnt get it to work.

5

This worked for me:

import pyrevit
from pyrevit import revit, DB

doc = revit.doc

CAD_links = list(DB.FilteredElementCollector(doc).OfClass(DB.ImportInstance).WhereElementIsNotElementType())

link_sub_cats = []
for link in CAD_links:

    link_cat = link.Category
    link_sub_cat = link_cat.SubCategories
    link_sub_cats.append(link_sub_cat)

#print("link_sub_cats", link_sub_cats)

layer_names = set()
for sub_cat in link_sub_cats:
    for sub in sub_cat:
        layer_names.add(sub.Name)

print("layer_names:",sorted(layer_names))
6

this worked for me in revitpytonshell :

import clr
clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import FilteredElementCollector, ImportInstance

doc = __revit__.ActiveUIDocument.Document

CAD_links = list(FilteredElementCollector(doc).OfClass(ImportInstance).WhereElementIsNotElementType())

link_sub_cats = []
for link in CAD_links:
    link_cat = doc.GetElement(link.GetTypeId()).Category
    link_sub_cat = link_cat.SubCategories
    link_sub_cats.append(link_sub_cat)

layer_names = set()
for sub_cat in link_sub_cats:
    for sub in sub_cat:
        layer_names.add(sub.Name)

print("layer_names:", sorted(layer_names))