fix: match Cesium intersection asphalt

blender/tests/test_pure.py

@@ -30,12 +30,23 @@ from osmassets.geom import (
     sample_tree_row,
     signed_polygon_area,
 )
+from osmassets.catalog import ROAD_LAYERS
 from osmassets.osm import Projector, parse_height, parse_osm, tags
 
 
 SQUARE = [(0.0, 0.0), (10.0, 0.0), (10.0, 10.0), (0.0, 10.0)]
 
 
+class RoadLayerCatalogTest(unittest.TestCase):
+    def test_intersection_and_road_asphalt_share_the_same_colour(self):
+        layers = {layer["id"]: layer for layer in ROAD_LAYERS}
+        self.assertEqual(layers["road_surface"]["color"],
+                         layers["intersection_surface"]["color"])
+        # They remain distinct meshes so the intersection stays above the road.
+        self.assertNotEqual(layers["road_surface"]["z"],
+                            layers["intersection_surface"]["z"])
+
+
 class GeometryRingsTest(unittest.TestCase):
     def test_polygon_keeps_only_the_exterior_ring(self):
         geometry = {"type": "Polygon", "coordinates": [["outer"], ["hole"]]}