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# SPDX-License-Identifier: GPL-2.0-or-later
import bpy
#=============================================
# Collection management
#=============================================
def find_layer_collection_by_collection(layer_collection, collection):
if collection == layer_collection.collection:
return layer_collection
# go recursive
for child in layer_collection.children:
layer_collection = find_layer_collection_by_collection(child, collection)
if layer_collection:
return layer_collection
def list_layer_collections(layer_collection, visible=False, selectable=False):
"""Returns a list of the collection and its children, with optional filtering by settings."""
if layer_collection.exclude:
return []
collection = layer_collection.collection
is_visible = not (layer_collection.hide_viewport or collection.hide_viewport)
is_selectable = is_visible and not collection.hide_select
if (selectable and not is_selectable) or (visible and not is_visible):
return []
found = [layer_collection]
for child in layer_collection.children:
found += list_layer_collections(child, visible, selectable)
return found
def filter_layer_collections_by_object(layer_collections, obj):
"""Returns a subset of collections that contain the given object."""
return [lc for lc in layer_collections if obj in lc.collection.objects.values()]
def ensure_collection(context, collection_name, hidden=False) -> bpy.types.Collection:
"""Check if a collection with a certain name exists.
If yes, return it, if not, create it in the scene root collection.
"""
view_layer = context.view_layer
active_layer_coll = bpy.context.layer_collection
active_collection = active_layer_coll.collection
collection = bpy.data.collections.get(collection_name)
if not collection:
# Create the collection
collection = bpy.data.collections.new(collection_name)
collection.hide_viewport = hidden
collection.hide_render = hidden
layer_collection = None
else:
layer_collection = find_layer_collection_by_collection(view_layer.layer_collection, collection)
if not layer_collection:
# Let the new collection be a child of the active one.
active_collection.children.link(collection)
layer_collection = [c for c in active_layer_coll.children if c.collection == collection][0]
layer_collection.exclude = True
# Make the new collection active.
view_layer.active_layer_collection = layer_collection
return collection
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