glTF exporter: export object from linked library

io_scene_gltf2/__init__.py

@@ -15,7 +15,7 @@
 bl_info = {
     'name': 'glTF 2.0 format',
     'author': 'Julien Duroure, Norbert Nopper, Urs Hanselmann, Moritz Becher, Benjamin Schmithüsen, Jim Eckerlein, and many external contributors',
-    "version": (0, 9, 41),
+    "version": (0, 9, 42),
     'blender': (2, 80, 0),
     'location': 'File > Import-Export',
     'description': 'Import-Export as glTF 2.0',

io_scene_gltf2/blender/exp/gltf2_blender_gather_nodes.py

@@ -91,7 +91,12 @@ def __filter_node(blender_object, blender_scene, export_settings):
     if blender_scene is not None:
         instanced =  any([blender_object.name in layer.objects for layer in blender_scene.view_layers])
         if instanced is False:
-            return False
+            # Check if object is from a linked collection
+            if any([blender_object.name in coll.objects for coll in bpy.data.collections if coll.library is not None]):
+                pass
+            else:
+                # Not instanced, not linked -> We don't keep this object
+                return False
     if export_settings[gltf2_blender_export_keys.SELECTED] and blender_object.select_get() is False:
         return False