gistfile1.diff

diff --git a/js/roadtrip.js b/js/roadtrip.js
index d738c95..f76cfe2 100644
--- a/js/roadtrip.js
+++ b/js/roadtrip.js
@@ -346,9 +361,15 @@ function addTube(planeMesh, cb) {
     function updateFromPoints(points) {
         var spline = new THREE.SplineCurve3(points);
         spline = layCurveOn(planeMesh, spline);
+
+        var rotMat = new THREE.Matrix4().makeRotationY(Math.PI/2);
+
         var tube = roadShape().extrude({
             steps: 2000,
-            extrudePath: spline
+            extrudePath: spline,
+            normalCallback: function(normal) {
+                normal.crossVectors(normal, v3unitY).applyMatrix4(rotMat);
+            }
         });
         addGeometry(tube);
         return spline;
@@ -364,6 +385,8 @@ function addTube(planeMesh, cb) {
     //return updateFromPoints();
 }
 
+var v3unitY = new THREE.Vector3(0, 1, 0);
+        
 function cameraAlongSpline(camera, spline, t) {
     var pos = spline.getPointAt(t);
     var offset = 45;
diff --git a/lib/three.js b/lib/three.js
index f549ec4..79ab1e0 100644
--- a/lib/three.js
+++ b/lib/three.js
@@ -32285,6 +32285,9 @@ THREE.ExtrudeGeometry.prototype.addShape = function ( shape, options ) {
   			normal.copy( splineTube.normals[s] ).multiplyScalar( vert.x );
 				binormal.copy( splineTube.binormals[s] ).multiplyScalar( vert.y );
 
+				if (options.normalCallback)
+					options.normalCallback(normal);
+
 				position2.copy( extrudePts[s] ).add( normal ).add( binormal );
 
 				v( position2.x, position2.y, position2.z );