scripts-blender/addons/brushstroke_tools/utils.py

@@ -266,9 +266,27 @@ def import_brushstroke_material():
     addon_prefs = bpy.context.preferences.addons[__package__].preferences
 
     mats_pre = set(bpy.data.materials)
+    ng_pre = set(bpy.data.node_groups)
     with bpy.data.libraries.load(path, link=addon_prefs.import_method=='LINK', relative=addon_prefs.import_relative_path) as (data_src, data_dst):
         data_dst.materials = [name]
     mats_new = list(set(bpy.data.materials) - mats_pre)
+
+    # de-duplicate imported node-groups
+    ng_new = list(set(bpy.data.node_groups) - ng_pre)
+    ng_remove = []
+    for ng in ng_new:
+        ng_name_elements = ng.name.split('.')
+        if len(ng_name_elements) == 1:
+            continue
+        root_ng = bpy.data.node_groups.get('.'.join(ng_name_elements[:-1]))
+        if not root_ng:
+            continue
+        ng.user_remap(root_ng)
+        ng_remove += [ng]
+    for ng in reversed(ng_remove):
+        bpy.data.node_groups.remove(ng)
+
+    # return imported material
     if mats_new:
         return mats_new[0]
     else: