Enhance validation and runtime support for spline corridor junctions

src/document/scene-document-validation.ts

@@ -3421,6 +3421,19 @@ function validateSplineCorridorJunction(
     );
   }
 
+  if (!isRecord(junction.edge)) {
+    diagnostics.push(
+      createDiagnostic(
+        "error",
+        "invalid-spline-corridor-junction-edge",
+        "Spline corridor junction edge settings must be an object.",
+        `${path}.edge`
+      )
+    );
+  } else {
+    validateScenePathRoadEdge(junction.edge, `${path}.edge`, document, diagnostics);
+  }
+
   if (!Array.isArray(junction.connections) || junction.connections.length < 2) {
     diagnostics.push(
       createDiagnostic(

src/runtime-three/runtime-scene-build.ts

@@ -546,8 +546,9 @@ export interface RuntimePath {
 }
 
 export interface RuntimeSplineCorridorJunction
-  extends SplineCorridorJunction {
+  extends Omit<SplineCorridorJunction, "edge"> {
   material: MaterialDef | null;
+  edge: RuntimePathRoadEdgeSettings;
 }
 
 export interface RuntimeFoliageDefinition {
@@ -2063,7 +2064,11 @@ export function buildRuntimeSceneFromDocument(
       ...junction,
       connections: junction.connections.map((connection) => ({ ...connection })),
       center: cloneVec3(junction.center),
-      material: resolveRuntimeMaterial(document, junction.materialId)
+      material: resolveRuntimeMaterial(document, junction.materialId),
+      edge: {
+        ...junction.edge,
+        material: resolveRuntimeMaterial(document, junction.edge.materialId)
+      }
     }));
   const splineCorridorClipIntervalsByPath =
     resolveSplineCorridorJunctionClipIntervals({