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.

tools/node_assets/validate.py

@@ -11,8 +11,12 @@ sys.path.insert(
 )
 
 from anyimage.operators.common.mesh_result import (
+    DEPTH_MATERIAL_NODE_GROUP_NAME,
+    IMAGE_MATERIAL_NODE_GROUP_NAME,
     load_asset_node_group,
+    node_asset_path,
 )
+from anyimage.operators.convert_to_plane.nodes import DEPTH_PLANE_NODE_GROUP_NAME
 from anyimage.operators.cutout_tool.shape import (
     CUTOUT_NODE_GROUP_NAME,
     CUTOUT_NODE_GROUP_NAMES,
@@ -30,11 +34,25 @@ def input_names(group):
 def main():
     bpy.ops.wm.read_factory_settings(use_empty=True)
     mesh_plane = load_asset_node_group("O Mesh Plane")
+    depth_plane = load_asset_node_group(DEPTH_PLANE_NODE_GROUP_NAME)
+    image_layer = load_asset_node_group(IMAGE_MATERIAL_NODE_GROUP_NAME)
+    depth_layer = load_asset_node_group(DEPTH_MATERIAL_NODE_GROUP_NAME)
     shadeless = load_asset_node_group("O Shadeless")
     cutout = load_asset_node_group(CUTOUT_NODE_GROUP_NAME)
     cutout_groups = {
         name: bpy.data.node_groups[name] for name in CUTOUT_NODE_GROUP_NAMES.values()
     }
+    expected_names = {
+        "O Mesh Plane",
+        DEPTH_PLANE_NODE_GROUP_NAME,
+        IMAGE_MATERIAL_NODE_GROUP_NAME,
+        DEPTH_MATERIAL_NODE_GROUP_NAME,
+        "O Shadeless",
+        CUTOUT_NODE_GROUP_NAME,
+        *CUTOUT_NODE_GROUP_NAMES.values(),
+    }
+    with bpy.data.libraries.load(str(node_asset_path()), link=False) as (source, _):
+        assert set(source.node_groups) == expected_names
 
     assert mesh_plane.name == "O Mesh Plane"
     assert mesh_plane.bl_idname == "GeometryNodeTree"
@@ -45,6 +63,34 @@ def main():
         "Thickness",
         "Material",
     ]
+    assert depth_plane.bl_idname == "GeometryNodeTree"
+    assert depth_plane.is_modifier
+    assert input_names(depth_plane) == [
+        "Geometry",
+        "Subdivide",
+        "Thickness",
+        "Depth Amount",
+        "Reference Depth",
+        "Uniform Scale",
+        "Depth Image",
+        "Material",
+    ]
+    assert image_layer.bl_idname == "ShaderNodeTree"
+    assert input_names(image_layer) == [
+        "Color",
+        "Alpha",
+        "Normal",
+        "Normal Scale",
+        "Object Space",
+        "Bump Scale",
+    ]
+    assert depth_layer.bl_idname == "ShaderNodeTree"
+    assert input_names(depth_layer) == [
+        "Color",
+        "Alpha",
+        "Depth",
+        "Bump Scale",
+    ]
     assert shadeless.name == "O Shadeless"
     assert shadeless.bl_idname == "ShaderNodeTree"
     assert input_names(shadeless) == ["Color"]
@@ -59,7 +105,14 @@ def main():
         assert not group.is_modifier
         assert input_names(group)[0] == "Geometry"
 
-    public_groups = {mesh_plane, shadeless, cutout}
+    public_groups = {
+        mesh_plane,
+        depth_plane,
+        image_layer,
+        depth_layer,
+        shadeless,
+        cutout,
+    }
     loaded = {*public_groups, *cutout_groups.values()}
     assert all(group.use_fake_user for group in public_groups)
     assert all(group.users > 0 for group in cutout_groups.values())