refactor: incorporate Depth Scale into Depth Split criteria for consistent geometry handling

tools/nodes/groups/image_depth_plane.py

@@ -40,7 +40,7 @@ def build_image_depth_plane_group(image_plane_group):
     depth_scale.default_value = 1.0
     depth_scale.min_value = 0.0
     depth_scale.max_value = 2.0
-    float_input(group, "Depth Split", 0.1, maximum=1, subtype="FACTOR").description = "Split the mesh where depth changes abruptly. Higher values detect smaller depth jumps. Zero disables splitting."
+    float_input(group, "Depth Split", 0.1, maximum=1, subtype="FACTOR").description = "Split the mesh where depth changes abruptly. Scaled by Depth Scale: a flat projection stays whole, higher values detect smaller depth jumps."
     valid_only = _interface_socket(group, "Depth Mask", "INPUT", "NodeSocketBool")
     valid_only.description = "Remove mesh areas marked invalid by the depth mask."
     valid_only.default_value = True
@@ -114,11 +114,12 @@ def build_image_depth_plane_group(image_plane_group):
     links.new(cull_controls.outputs["Depth Mask"], cull.inputs["Switch"])
     links.new(culled, cull.inputs["True"])
     links.new(protected, cull.inputs["False"])
-    split_input = _group_input(nodes, {"Depth Split"})
+    split_input = _group_input(nodes, {"Depth Split", "Depth Scale"})
     reference_input = _group_input(nodes, {"Reference Depth"})
     geometry, corner_camera, cut_vertex = split_depth_surface(
         group, cull.outputs["Output"], sample_face_camera(group, texture_input.outputs["Depth Image"]),
         split_input.outputs["Depth Split"], reference_input.outputs["Reference Depth"],
+        split_input.outputs["Depth Scale"],
     )
     camera = build_surface_camera(
         group, texture.outputs["Color"], corner_camera, cut_vertex,