Add depth surface processing and layout tools

- Implemented `cutout_depth_surface.py` for face separation and connected thickness calculations for depth surface assets.
- Created `cutout_depth_surface_layout.py` to arrange nodes for staggered calculation branches in depth surface processing.
- Authored `geometry_layouts.py` to define layouts for various geometry assets, including image cutouts and depth planes.
- Introduced `node_layout.py` for shared presentation rules, facilitating node arrangement and validation in geometry-node layouts.

tools/node_assets/build_mesh_plane.py

@@ -2,6 +2,8 @@
 
 import bpy
 
+from geometry_layouts import layout_geometry
+
 
 MESH_PLANE_GROUP_NAME = "O Mesh Plane"
 
@@ -27,6 +29,31 @@ def new_group_input(nodes, location, visible_names):
     return node
 
 
+def localize_dimensions(group):
+    """Repeat the small source-bounds calculation near UV and mesh consumers."""
+    sources = [
+        group.nodes[name] for name in ("Bounding Box", "Vector Math", "Separate XYZ")
+    ]
+    for targets in (
+        {"Math.011", "Math.013"},
+        {"Grid", "Combine XYZ.001", "Vector Math.001"},
+    ):
+        copies = {source: group.nodes.new(source.bl_idname) for source in sources}
+        copies[sources[1]].operation = "SUBTRACT"
+        for link in list(group.links):
+            if link.to_node in copies:
+                source = copies.get(link.from_node, link.from_node)
+                group.links.new(
+                    source.outputs[link.from_socket.identifier],
+                    copies[link.to_node].inputs[link.to_socket.identifier],
+                )
+            elif link.from_node in copies and link.to_node.name in targets:
+                group.links.new(
+                    copies[link.from_node].outputs[link.from_socket.identifier],
+                    link.to_socket,
+                )
+
+
 def build_mesh_plane_group():
     group = bpy.data.node_groups.new(MESH_PLANE_GROUP_NAME, "GeometryNodeTree")
     group.is_modifier = True
@@ -256,4 +283,6 @@ def build_mesh_plane_group():
         "Build an aspect-adaptive image plane and add optional centered thickness."
     )
     group.use_fake_user = True
+    localize_dimensions(group)
+    layout_geometry(group)
     return group