diff --git a/js/l3d/apps/prototype/interactive/main.js b/js/l3d/apps/prototype/interactive/main.js
index 75c4394..e66a41a 100644
--- a/js/l3d/apps/prototype/interactive/main.js
+++ b/js/l3d/apps/prototype/interactive/main.js
@@ -137,13 +137,10 @@ function render() {
     objectClicker.update();
 
     // Update recommendations (set raycastable if shown)
-    var transform = buttonManager.showArrows ? show : hide;
     recommendations.map(function(reco) {
         if (reco instanceof Recommendation) {
-            transform(reco);
-
             reco.traverse(function(elt) {
-                elt.raycastable = buttonManager.showArrows;
+                elt.visible = elt.raycastable = buttonManager.showArrows;
             });
         }
     });
diff --git a/js/l3d/src/recommendations/BaseRecommendation.js b/js/l3d/src/recommendations/BaseRecommendation.js
index 35deefd..965d47b 100644
--- a/js/l3d/src/recommendations/BaseRecommendation.js
+++ b/js/l3d/src/recommendations/BaseRecommendation.js
@@ -159,6 +159,7 @@ L3D.BaseRecommendation.prototype.updateExtremity = function() {
 
     this.mesh.geometry.computeFaceNormals();
     this.mesh.geometry.verticesNeedUpdate = true;
+    this.mesh.geometry.normalsNeedUpdate = true;
 
 };