Refactor and enhance geometry node groups for depth plane and material layers

- Updated the depth plane node group to load from an asset and simplified the interface.
- Created a new build script for depth plane geometry nodes.
- Introduced material layer groups for image and depth materials with appropriate sockets.
- Added functionality to connect balloon normal scale to the image material.
- Enhanced tests to validate the new node groups and their connections.
- Ensured that production code does not create node groups directly.

src/anyimage/operators/cutout_tool/object.py

@@ -10,6 +10,7 @@ from ..common.image_data import (
 )
 from ..common.depth_data import camera_depth_values, depth_uniform_scale
 from ..common.mesh_result import (
+    IMAGE_MATERIAL_NODE_GROUP_NAME,
     create_image_material,
     finalize_object_result,
     load_asset_node_group,
@@ -30,6 +31,7 @@ from .geometry import (
 )
 from .shape import (
     BALLOON_ATTRIBUTE_NAME,
+    BALLOON_CUTOUT_SHAPES,
     CUTOUT_NODE_GROUP_NAME,
     CUTOUT_SHAPE_INDICES,
     DEPTH_CUTOUT_SHAPES,
@@ -124,6 +126,24 @@ def load_cutout_node_group():
     return load_asset_node_group(CUTOUT_NODE_GROUP_NAME)
 
 
+def _connect_balloon_normal_scale(material):
+    nodes = material.node_tree.nodes
+    image_layer = next(
+        node
+        for node in nodes
+        if node.bl_idname == "ShaderNodeGroup"
+        and node.node_tree is not None
+        and node.node_tree.name == IMAGE_MATERIAL_NODE_GROUP_NAME
+    )
+    attribute = nodes.new("ShaderNodeAttribute")
+    attribute.attribute_type = "GEOMETRY"
+    attribute.attribute_name = BALLOON_ATTRIBUTE_NAME
+    attribute.location = (-550.0, -250.0)
+    material.node_tree.links.new(
+        attribute.outputs["Fac"], image_layer.inputs["Normal Scale"]
+    )
+
+
 def create_shape_object(
     context,
     source_object,
@@ -178,6 +198,8 @@ def create_shape_object(
             scene=context.scene,
         )
         depth_reference = None
+        if shape in BALLOON_CUTOUT_SHAPES:
+            _connect_balloon_normal_scale(material)
         uniform_scale = None
         depth_direction = None
         if shape in DEPTH_CUTOUT_SHAPES:

src/anyimage/operators/cutout_tool/shape.py

@@ -19,3 +19,4 @@ CUTOUT_SHAPE_INDICES = {
 }
 CUTOUT_SHAPES = frozenset(CUTOUT_NODE_GROUP_NAMES)
 DEPTH_CUTOUT_SHAPES = frozenset({"DEPTH_BALLOON", "DEPTH_SURFACE"})
+BALLOON_CUTOUT_SHAPES = frozenset({"BALLOON", "DEPTH_BALLOON"})