diff --git a/web/app/3d/ctrl.js b/web/app/3d/ctrl.js
index 3084303f..ab691270 100644
--- a/web/app/3d/ctrl.js
+++ b/web/app/3d/ctrl.js
@@ -10,7 +10,7 @@ TCAD.UI = function(app) {
   var debugFolder = new tk.Folder("Debug");
   var exportFolder = new tk.Folder("Export");
   var modificationsFolder = new tk.Folder("Modifications");
-  var extrude, cut, edit, addPlane, save,
+  var extrude, cut, edit, addPlane, save, deselectAll,
     refreshSketches, showSketches, printSolids, printFace, printFaceId, finishHistory, stlExport;
   tk.add(mainBox, propFolder);
   tk.add(propFolder, extrude = new tk.Button("Extrude"));
@@ -20,6 +20,7 @@ TCAD.UI = function(app) {
   tk.add(propFolder, refreshSketches = new tk.Button("Refresh Sketches"));
   tk.add(propFolder, save = new tk.Button("Save"));
   tk.add(propFolder, showSketches = new tk.CheckBox("Show Sketches", true));
+  tk.add(propFolder, deselectAll = new tk.Button("Deselect All"));
   tk.add(mainBox, exportFolder);
   tk.add(exportFolder, stlExport = new tk.Button("STL"));
   //tk.add(mainBox, debugFolder);
@@ -124,6 +125,9 @@ TCAD.UI = function(app) {
   save.root.click(function() {
     app.save();
   });
+  deselectAll.root.click(function() {
+    app.viewer.selectionMgr.deselectAll();
+  });
   stlExport.root.click(function() {
     var allPolygons = TCAD.utils.arrFlatten1L(app.findAllSolids().map(function (s) {
       return s.csg.toPolygons()
diff --git a/web/app/3d/viewer.js b/web/app/3d/viewer.js
index 58643941..8952e978 100644
--- a/web/app/3d/viewer.js
+++ b/web/app/3d/viewer.js
@@ -233,6 +233,14 @@ TCAD.SelectionManager.prototype.select = function(sketchFace) {
   this.viewer.render();
 };
 
+TCAD.SelectionManager.prototype.deselectAll = function() {
+  for (var i = 0; i < this.selection.length; ++ i) {
+    this.selection[i].solid.mesh.geometry.colorsNeedUpdate = true;
+  }
+  this.clear();
+  this.viewer.render();
+};
+
 TCAD.SelectionManager.prototype.contains = function(face) {
   return this.selection.indexOf(face) != -1;
 };