Refactor geometry generation to standardize Blender object coordinates

- Unified the canonical local frame for generated geometries (Plane, Depth Plane, Relief Plane, Cutout, Depth Cutout) to align with Blender's object coordinate system, setting X as horizontal, Z as up, and +Y as depth.
- Removed the `Depth Axis` parameter from `O Image Cutout` and `O Image Depth Cutout`, simplifying the geometry generation process.
- Updated the depth direction defaults to use +Y instead of -Z for `O Image Relief Plane` and Depth Symmetry.
- Adjusted the geometry nodes to ensure thickness, projection, and shell displacements operate along the Y-axis.
- Implemented new capabilities for handling object space normals to align with the new canonical frame.
- Enhanced the Depth Symmetry functionality to mirror across the canonical Y-axis and perform a final rotation to maintain the correct orientation.
- Added tests to validate the new coordinate system and ensure compatibility with existing assets.

tests/tools/nodes/test_boundary_smoothing.py

@@ -122,7 +122,7 @@ def test_smoothing_reduces_stairs_without_leaving_two_ring_band(triangles):
     original, faces = evaluated(obj)
     boundary = boundary_neighbors(faces)
     outer = np.isclose(original[:, 0], 0) | np.isclose(original[:, 0], 2)
-    outer |= np.isclose(original[:, 1], 0) | np.isclose(original[:, 1], 1)
+    outer |= np.isclose(original[:, 2], 0) | np.isclose(original[:, 2], 1)
     cut = {i for i in boundary if not outer[i]}
     band = edge_band(faces, boundary)
     movable = np.array([i in band for i in range(len(original))])
@@ -142,7 +142,7 @@ def test_smoothing_reduces_stairs_without_leaving_two_ring_band(triangles):
         before.append(np.linalg.norm(original[adjacent].mean(axis=0) - original[i]))
         after.append(np.linalg.norm(smoothed[adjacent].mean(axis=0) - smoothed[i]))
     assert sum(after) < 0.8 * sum(before)
-    np.testing.assert_array_equal(smoothed[:, 2], original[:, 2])
+    np.testing.assert_array_equal(smoothed[:, 1], original[:, 1])
     set_value("Smooth Weight", 0)
     np.testing.assert_array_equal(evaluated(obj)[0], original)
     set_value("Smooth Weight", 1)
@@ -251,7 +251,7 @@ def test_validity_cut_smoothing_preserves_original_outline_and_interior():
     set_value("Depth Mask", True)
     before, faces, uv, *_ = plane_mesh(obj)
     boundary = boundary_neighbors(faces)
-    outer = np.any(np.isclose(before[:, :2], low[:2]) | np.isclose(before[:, :2], high[:2]), axis=1)
+    outer = np.any(np.isclose(before[:, [0, 2]], low[[0, 2]]) | np.isclose(before[:, [0, 2]], high[[0, 2]]), axis=1)
     cut = {i for i in boundary if not outer[i]}
     band = edge_band(faces, cut)
     fixed = np.array([i not in band or outer[i] for i in range(len(before))])