[Blender] Baking optimization

cg/blender/utils/collection_tools.py

@@ -0,0 +1,57 @@
+# coding: utf-8
+# Copyright (C) 2023 Ilia Kurochkin <brothermechanic@gmail.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+'''
+DESCRIPTION.
+Various collection tools.
+'''
+__version__ = '0.1'
+
+import bpy
+from collections import defaultdict
+
+
+def copy_objects(from_col, to_col, linked, double_lut):
+    '''Function copying objects from collection to collection.'''
+    for obj in from_col.objects:
+        double = obj.copy()
+        if not linked and obj.data:
+            double.data = double.data.copy()
+        to_col.objects.link(double)
+        double_lut[obj] = double
+    return True
+
+
+def copy_collections_recursive(collection, suffix='copy', linked=False):
+    '''Function recursive copying collection.'''
+    double_lut = defaultdict(lambda: None)
+    parent = [p for p in (bpy.data.collections[:] + [bpy.context.scene.collection])
+              if collection.name in p.children.keys()][0]
+
+    def _copy(parent, collection, suffix, linked=False):
+        '''Function copying collection.'''
+        clone_collection = bpy.data.collections.new(
+            '_'.join((collection.name, suffix))
+        )
+        copy_objects(collection, clone_collection, linked, double_lut)
+
+        for _collection in collection.children:
+            _copy(clone_collection, _collection, suffix, linked)
+
+        parent.children.link(clone_collection)
+
+    _copy(parent, collection, suffix, linked)
+    for obj, double in tuple(double_lut.items()):
+        parent = double_lut[obj.parent]
+        if parent:
+            double.parent = parent
+    return True