auto-git:

[change] src/geometry/spline-road-mesh.ts

src/geometry/spline-road-mesh.ts

@@ -512,6 +512,7 @@ export function buildSplineRoadEdgeMeshData(options: {
   path: SplineRoadPathLike;
   side: ScenePathRoadEdgeSide;
   terrains?: readonly Terrain[];
+  clipIntervals?: readonly SplineCorridorPathClipInterval[];
 }): SplineRoadEdgeMeshData | null {
   const { path, side } = options;
   const edge = path.road.edges[side];
@@ -542,64 +543,80 @@ export function buildSplineRoadEdgeMeshData(options: {
   const uvs: number[] = [];
   const indices: number[] = [];
   const profileLastIndex = Math.max(1, profile.length - 1);
+  const stationRuns = buildVisibleRoadStationRuns(
+    stations,
+    options.clipIntervals ?? []
+  );
+  let stationCount = 0;
 
-  for (let stationIndex = 0; stationIndex < stations.length; stationIndex += 1) {
-    const station = stations[stationIndex]!;
-    const tangent = resolveStationTangent(stations, stationIndex);
+  for (const run of stationRuns) {
+    const runVertexOffset = positions.length / 3;
 
-    if (tangent === null) {
-      return null;
-    }
+    for (let stationIndex = 0; stationIndex < run.length; stationIndex += 1) {
+      const station = run[stationIndex]!;
+      const tangent = resolveStationTangent(run, stationIndex);
 
-    const leftDirection = {
-      x: -tangent.z,
-      y: 0,
-      z: tangent.x
-    };
+      if (tangent === null) {
+        return null;
+      }
 
-    for (let profileIndex = 0; profileIndex < profile.length; profileIndex += 1) {
-      const profilePoint = profile[profileIndex]!;
-      const edgePoint = addVec3(station.center, {
-        x: leftDirection.x * profilePoint.offset,
+      const leftDirection = {
+        x: -tangent.z,
         y: 0,
-        z: leftDirection.z * profilePoint.offset
-      });
-      const vertex = resolveRoadVertexPosition({
-        path,
-        terrains,
-        point: edgePoint,
-        fallbackY: station.center.y
-      });
+        z: tangent.x
+      };
 
-      positions.push(
-        vertex.x,
-        vertex.y + profilePoint.heightOffset,
-        vertex.z
-      );
-      uvs.push(profileIndex / profileLastIndex, station.distance);
+      for (let profileIndex = 0; profileIndex < profile.length; profileIndex += 1) {
+        const profilePoint = profile[profileIndex]!;
+        const edgePoint = addVec3(station.center, {
+          x: leftDirection.x * profilePoint.offset,
+          y: 0,
+          z: leftDirection.z * profilePoint.offset
+        });
+        const vertex = resolveRoadVertexPosition({
+          path,
+          terrains,
+          point: edgePoint,
+          fallbackY: station.center.y
+        });
+
+        positions.push(
+          vertex.x,
+          vertex.y + profilePoint.heightOffset,
+          vertex.z
+        );
+        uvs.push(profileIndex / profileLastIndex, station.distance);
+      }
     }
+
+    for (let stationIndex = 0; stationIndex < run.length - 1; stationIndex += 1) {
+      const currentRow = runVertexOffset + stationIndex * profile.length;
+      const nextRow = currentRow + profile.length;
+
+      for (let profileIndex = 0; profileIndex < profile.length - 1; profileIndex += 1) {
+        const current = currentRow + profileIndex;
+        const currentNext = current + 1;
+        const next = nextRow + profileIndex;
+        const nextNext = next + 1;
+
+        indices.push(current, currentNext, next, next, currentNext, nextNext);
+      }
+    }
+
+    if (edge.kind !== "softShoulder") {
+      addEdgeProfileCaps({
+        indices,
+        profileVertexCount: profile.length,
+        vertexOffset: runVertexOffset,
+        stationCount: run.length
+      });
+    }
+
+    stationCount += run.length;
   }
 
-  for (let stationIndex = 0; stationIndex < stations.length - 1; stationIndex += 1) {
-    const currentRow = stationIndex * profile.length;
-    const nextRow = currentRow + profile.length;
-
-    for (let profileIndex = 0; profileIndex < profile.length - 1; profileIndex += 1) {
-      const current = currentRow + profileIndex;
-      const currentNext = current + 1;
-      const next = nextRow + profileIndex;
-      const nextNext = next + 1;
-
-      indices.push(current, currentNext, next, next, currentNext, nextNext);
-    }
-  }
-
-  if (edge.kind !== "softShoulder") {
-    addEdgeProfileCaps({
-      indices,
-      profileVertexCount: profile.length,
-      stationCount: stations.length
-    });
+  if (positions.length === 0) {
+    return null;
   }
 
   return {
@@ -608,7 +625,7 @@ export function buildSplineRoadEdgeMeshData(options: {
     positions: new Float32Array(positions),
     uvs: new Float32Array(uvs),
     indices: new Uint32Array(indices),
-    stationCount: stations.length,
+    stationCount,
     totalLength: stations[stations.length - 1]?.distance ?? 0
   };
 }
@@ -617,6 +634,7 @@ export function buildSplineRoadEdgeMeshGeometry(options: {
   path: SplineRoadPathLike;
   side: ScenePathRoadEdgeSide;
   terrains?: readonly Terrain[];
+  clipIntervals?: readonly SplineCorridorPathClipInterval[];
 }): BufferGeometry | null {
   const meshData = buildSplineRoadEdgeMeshData(options);