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

tests/tools/nodes/test_image_depth_panorama.py

@@ -194,6 +194,21 @@ def test_material_uv_matches_radial_sampling_and_faces_point_inward():
         result.to_mesh_clear()
 
 
+def test_depth_scale_gates_split_selection():
+    depth = np.ones((64, 128))
+    depth[:, 64:] = 7
+    obj, set_value = panorama(depth)
+    set_value("Depth Scale", 0)
+    whole = evaluated(obj)
+    set_value("Depth Split", 1)
+    flat = evaluated(obj)
+    # A flat projection keeps the sphere whole, whatever the split strength is.
+    assert flat[1] == whole[1]
+    np.testing.assert_allclose(flat[0], whole[0], atol=1e-6)
+    set_value("Depth Scale", 1)
+    assert len(evaluated(obj)[0]) > len(flat[0])
+
+
 def test_split_strength_and_distance_scale_invariance():
     depth = np.ones((64, 128))
     depth[:, 64:] = 7