diff --git a/static/scripts/editor.js b/static/scripts/editor.js
index d676cf2..57be609 100644
--- a/static/scripts/editor.js
+++ b/static/scripts/editor.js
@@ -133,8 +133,8 @@ editor.onKey = function(evt) {
         editor.gridTimeOut = 0;
     }
     if (evt.keyCode === 67) {
-        materials.curveProperties.splineDensity = materials.curveProperties.splineDensity == 10 ? 1 : 10;
-        gui.render();
+        curvy.checked = !curvy.checked;
+        api.poll();
     }
 };
 
diff --git a/static/scripts/gui.js b/static/scripts/gui.js
index dbe5edb..905a941 100644
--- a/static/scripts/gui.js
+++ b/static/scripts/gui.js
@@ -3,7 +3,7 @@ gui.prepare = function() {
     gui.renderer = new THREE.WebGLRenderer({
         "antialias": true
     });
-    gui.renderer.setSize(window.innerWidth, window.innerHeight);
+    gui.renderer.setSize(window.innerWidth, window.innerHeight-5);
     gui.renderer.setClearColor(0xffffff, 1);
     document.querySelector("body").appendChild(gui.renderer.domElement);
     window.addEventListener("resize", gui.onWindowResize, false);
@@ -26,7 +26,7 @@ gui.prepare = function() {
 gui.onWindowResize = function(evt) {
     gui.camera.aspect = window.innerWidth / window.innerHeight;
     gui.camera.updateProjectionMatrix();
-    gui.renderer.setSize(window.innerWidth, window.innerHeight);
+    gui.renderer.setSize(window.innerWidth, window.innerHeight-5);
     gui.render();
 };
 
diff --git a/static/scripts/materials.js b/static/scripts/materials.js
index 31cf9f1..1b8fbba 100644
--- a/static/scripts/materials.js
+++ b/static/scripts/materials.js
@@ -23,8 +23,8 @@ materials.prepare = function() {
     };
 };
 
-
 materials.makeCurve = function(a, b) {
+    materials.curveProperties.splineDensity = curvy.checked ? 10 : 1;
     console.log("New curve, " + materials.curveProperties.splineDensity);
     var length = new THREE.Vector3().subVectors(a, b).length();
     var bend = new THREE.Vector3(length / materials.curveProperties.curvature, length / materials.curveProperties.curvature, 0);
diff --git a/templates/index.html b/templates/index.html
index 30b52e1..c45d6e9 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -47,6 +47,7 @@
         <li><a onclick="editor.raussendorf()">Raussendorf</a></li>
         <li><a onclick="share()">Share</a></li>
         <li><a href="/{{uuid}}/download">Download</a></li>
+        <li><input id=curvy type="checkbox"></input> Curved edges</li>
         <li><a href="/doc" id=help>Documentation</a></li>
     </ul>
 </div>