Refactor geometry node groups for image depth processing

- Introduced new utility functions in common nodes for evaluating fields and capturing attributes.
- Simplified volume field calculations in image depth cutout and panorama groups by utilizing new utility functions.
- Enhanced readability and maintainability of the image depth cutout and panorama node groups by removing redundant code and improving function usage.
- Adjusted default values for thickness and depth scale in image relief plane group for better user experience.
- Improved handling of geometry attributes and connections in image depth plane group to streamline processing.

tests/tools/nodes/test_depth_relief_planes.py

@@ -144,6 +144,22 @@ def test_relief_reads_z_and_keeps_the_base(relief, thickness):
     assert obj.modifiers[0][inputs["Thickness"].identifier] == pytest.approx(thickness)
 
 
+@pytest.mark.parametrize("reference", [0.5, 1.25, 2.0])
+def test_zero_thickness_relief_keeps_far_depth_at_object_space_zero(relief, reference):
+    obj, set_value, _, _, _ = relief
+    base = evaluated(obj)
+    texel_x = np.clip((base[0][:, 0] + 2) / 4 * 16, 0.5, 15.5)
+    depth = (2 + texel_x / 16) * 0.5
+    expected = np.maximum((reference - depth) * 1.5, 0)
+    set_value("Reference Depth", reference)
+    set_value("Depth Scale", 1.5)
+    result = evaluated(obj)
+    np.testing.assert_allclose(result[0][:, 2], expected, atol=1e-6)
+    np.testing.assert_array_equal(result[0][:, :2], base[0][:, :2])
+    assert result[1] == base[1]
+    np.testing.assert_array_equal(result[2], base[2])
+
+
 @pytest.mark.parametrize("normal_smooth", [0, 2, 50])
 def test_curved_shell_smooths_normals_without_shrinking_thickness(surface, normal_smooth):
     from scipy.spatial import cKDTree
@@ -197,7 +213,7 @@ def test_surface_interface_and_node_structure(surface):
     assert inputs["Split Threshold"].subtype == "FACTOR"
     assert inputs["Split Threshold"].parent == inputs["Smooth"].parent
     assert inputs["Split Threshold"].parent.name != "Options"
-    assert inputs["Validity Threshold"].default_value == pytest.approx(0.1)
+    assert inputs["Validity Threshold"].default_value == pytest.approx(0.9)
     assert inputs["Validity Threshold"].parent.name == "Options"
     assert inputs["Validity Threshold"].subtype == "FACTOR"
     assert inputs["Valid Only"].default_value is True
@@ -223,9 +239,9 @@ def test_relief_interface_and_node_structure(relief):
     obj, _, _, inputs, _ = relief
     assert list(inputs) == ["Geometry", "Subdivide", "Thickness", "Depth Scale",
                             "Reference Depth", "Uniform Scale", "Depth Image"]
-    assert inputs["Thickness"].default_value == 0
+    assert inputs["Thickness"].default_value == 0.5
     assert inputs["Subdivide"].default_value == 6
-    assert inputs["Depth Scale"].default_value == 1
+    assert inputs["Depth Scale"].default_value == 0.5
     assert all(item.structure_type == "SINGLE" for item in inputs.values())
     assert inputs["Thickness"].subtype == inputs["Reference Depth"].subtype == "DISTANCE"
     assert inputs["Uniform Scale"].hide_in_modifier and inputs["Depth Image"].hide_in_modifier