refactor: Update cutout and depth handling by removing unused functions and adjusting parameters

tests/tools/nodes/test_depth_cutout.py

@@ -20,6 +20,36 @@ def store_test_fields(group, geometry, fields):
     return geometry
 
 
+@pytest.mark.parametrize("mode", [0, 1])
+def test_normal_smooth_changes_thickness_direction_without_moving_zero_thickness(mode):
+    from tests.support.depth_surface import surface, evaluated
+
+    obj, set_value = surface(step=1, resolution=10)
+    xy = np.array([v.co[:2] for v in obj.data.vertices])
+    profile = .3 * np.sin(np.pi * xy[:, 0] / 2) * np.sin(np.pi * xy[:, 1])
+    profile[abs(profile) < 1e-7] = 0
+    obj.data.attributes.new("o_balloon", "FLOAT", "POINT").data.foreach_set("value", profile)
+    set_value("Mode", mode)
+    set_value("Front Inflation", .2)
+    modifier = obj.modifiers[0]
+    thickness = modifier_input_identifier(modifier.node_group, "Thickness", subtype="DISTANCE" if mode else "NONE")
+
+    def result(amount, smoothing):
+        set_modifier_input(modifier, thickness, amount)
+        set_value("Normal Smooth", smoothing)
+        return evaluated(obj)
+
+    raw, faces = result(0, 16)
+    smooth, smooth_faces = result(0, 512)
+    np.testing.assert_array_equal(raw, smooth)
+    assert faces == smooth_faces
+    raw, faces = result(1, 16)
+    smooth, smooth_faces = result(1, 512)
+    assert faces == smooth_faces
+    assert np.isfinite(smooth).all()
+    assert np.max(np.abs(raw - smooth)) > 1e-5
+
+
 def set_test_structure(monkeypatch, value):
     """Control structural amplitude without depending on storage nodes."""
     from tools.nodes.groups import image_depth_cutout