feat: add tests for outline points and thickness handling in depth surface

tests/tools/nodes/test_depth_surface_split.py

@@ -145,6 +145,34 @@ def test_planar_depth_preserves_blocks_and_cleans_single_face_width(resolution):
     np.testing.assert_allclose(coords, original, atol=1e-6)
 
 
+def test_outline_points_use_adjacent_face_depth_without_split():
+    obj, set_value = surface(step=0.0, resolution=2)
+    image = bpy.data.images["Camera"]
+    pixels = np.array(image.pixels[:], np.float32).reshape(32, 64, 4)
+    pixels[..., 2] = 1
+    # Spike both edge rows to cover Blender's image origin without relying on it.
+    pixels[(0, -1), :, 2] = 10
+    image.pixels.foreach_set(pixels.ravel())
+    image.update()
+    obj.update_tag(refresh={"DATA"})
+    bpy.context.view_layer.update()
+    set_value("Depth Split", 0.0)
+    coords, faces = evaluated(obj)
+    boundary = np.isclose(coords[:, 2], 0, atol=0.05) | np.isclose(coords[:, 2], 1, atol=0.05)
+    assert boundary.any()
+    np.testing.assert_allclose(coords[boundary, 1], 0, atol=1e-5)
+
+
+def test_thickness_handles_more_than_4096_source_vertices():
+    obj, set_value = surface(step=0.0, resolution=45)
+    assert len(obj.data.vertices) > 4096
+    set_value("Depth Split", 0.0)
+    set_value("Thickness", 0.02)
+    coords, faces = evaluated(obj)
+    assert np.isfinite(coords).all()
+    assert_closed(faces)
+
+
 def test_small_positive_split_preserves_unsplit_projection():
     obj, set_value = surface(step=2.0)
     original, original_faces = evaluated(obj)