From 30e84371e0be60bfd31d912ae342b70f7f5383b4 Mon Sep 17 00:00:00 2001
From: Roy Nieterau <roy_nieterau@hotmail.com>
Date: Wed, 20 Mar 2024 17:16:32 +0100
Subject: [PATCH 1/2] Blender: Export Alembic with subdiv schema (creases)

---
 .../blender/plugins/publish/extract_abc.py    | 21 ++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/client/ayon_core/hosts/blender/plugins/publish/extract_abc.py b/client/ayon_core/hosts/blender/plugins/publish/extract_abc.py
index 094f88fd8c..6251c1c0c5 100644
--- a/client/ayon_core/hosts/blender/plugins/publish/extract_abc.py
+++ b/client/ayon_core/hosts/blender/plugins/publish/extract_abc.py
@@ -2,6 +2,7 @@ import os
 
 import bpy
 
+from ayon_core.lib import BoolDef
 from ayon_core.pipeline import publish
 from ayon_core.hosts.blender.api import plugin
 
@@ -17,6 +18,8 @@ class ExtractABC(publish.Extractor, publish.OptionalPyblishPluginMixin):
         if not self.is_active(instance.data):
             return
 
+        attr_values = self.get_attr_values_from_data(instance.data)
+
         # Define extract output file path
         stagingdir = self.staging_dir(instance)
         folder_name = instance.data["folderEntity"]["name"]
@@ -46,7 +49,8 @@ class ExtractABC(publish.Extractor, publish.OptionalPyblishPluginMixin):
             bpy.ops.wm.alembic_export(
                 filepath=filepath,
                 selected=True,
-                flatten=False
+                flatten=False,
+                subdiv_schema=attr_values.get("subdiv_schema", False)
             )
 
         plugin.deselect_all()
@@ -65,6 +69,21 @@ class ExtractABC(publish.Extractor, publish.OptionalPyblishPluginMixin):
         self.log.debug("Extracted instance '%s' to: %s",
                        instance.name, representation)
 
+    @classmethod
+    def get_attribute_defs(cls):
+        return [
+            BoolDef(
+                "subdiv_schema",
+                label="Alembic Mesh Subdiv Schema",
+                tooltip="Export Meshes using Alembic's subdivision schema.\n"
+                        "Enabling this includes creases with the export but "
+                        "excludes the mesh's normals.\n"
+                        "Enabling this usually result in smaller file size "
+                        "due to lack of normals.",
+                default=True
+            )
+        ]
+
 
 class ExtractModelABC(ExtractABC):
     """Extract model as ABC."""

From b2af91ba37adcb8cff5fd669d8f2e65b5eb91aa5 Mon Sep 17 00:00:00 2001
From: Roy Nieterau <roy_nieterau@hotmail.com>
Date: Wed, 20 Mar 2024 17:17:42 +0100
Subject: [PATCH 2/2] Default to False for backwards compatibility

---
 client/ayon_core/hosts/blender/plugins/publish/extract_abc.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/client/ayon_core/hosts/blender/plugins/publish/extract_abc.py b/client/ayon_core/hosts/blender/plugins/publish/extract_abc.py
index 6251c1c0c5..6590be515c 100644
--- a/client/ayon_core/hosts/blender/plugins/publish/extract_abc.py
+++ b/client/ayon_core/hosts/blender/plugins/publish/extract_abc.py
@@ -80,7 +80,7 @@ class ExtractABC(publish.Extractor, publish.OptionalPyblishPluginMixin):
                         "excludes the mesh's normals.\n"
                         "Enabling this usually result in smaller file size "
                         "due to lack of normals.",
-                default=True
+                default=False
             )
         ]