diff -r 098335a1d510 -r b3cf0176512e stlviewer.js
--- a/stlviewer.js	Tue Apr 04 00:47:22 2017 +0200
+++ b/stlviewer.js	Tue Apr 04 03:13:58 2017 +0200
@@ -25,7 +25,7 @@
 function clear_scene() {
     scene.children.forEach(function(v){
         if(v.stlfile === true) {
-            v.material.dispose();
+            //v.material.dispose();
             v.geometry.dispose();
             scene.remove(v);
         }
@@ -59,12 +59,14 @@
                 if (obj[5] == "") {
                     // spacer
                     filename = "stl/spacer_" + obj[4][0] + '.stl';
+                    material = 'm_spacer';
                 } else {
                     // cylinder
                     filename = "stl/cylinder_" + obj[5] + '.stl';
+                    material = 'm_cylinder';
                 }
                 position = [data.scale3d * 0.01 * obj[0], 0, 0];
-                loadSTL(filename, null, position);
+                loadSTL(filename, material + "", position);
             }
 
         }
@@ -75,10 +77,16 @@
     //console.log(filename, position);
     var loader = new THREE.STLLoader();
     loader.load( filename, function ( geometry ) {
-        if (!material)
+        /*if (!material)
             var material = new THREE.MeshPhongMaterial( {
                 color: 0xff5533, specular: 0x111111, shininess: 200 } );
+        else {*/
+            if (material == 'm_spacer') material = m_spacer;
+            else if (material == 'm_cylinder') material = m_cylinder;
+        //}
+        
         var mesh = new THREE.Mesh( geometry, material );
+        //assignUVs(mesh.geometry);
         mesh["stlfile"] = true;
         if (!position) mesh.position.set( 0, -0.25, 0 ); else 
             mesh.position.set( position[0], position[1], position[2] );
@@ -139,7 +147,7 @@
     renderer.gammaOutput = true;
 
     renderer.shadowMap.enabled = true;
-    renderer.shadowMap.renderReverseSided = true;
+    renderer.shadowMap.renderReverseSided = false;
 
     container.appendChild( renderer.domElement );
 
@@ -196,4 +204,29 @@
     camera.position.z = Math.sin( timer ) * 3;
     camera.lookAt( cameraTarget );
     renderer.render( scene, camera );
+}
+
+function assignUVs(geometry) {
+
+    geometry.faceVertexUvs[0] = [];
+
+    geometry.faces.forEach(function(face) {
+
+        var components = ['x', 'y', 'z'].sort(function(a, b) {
+            return Math.abs(face.normal[a]) > Math.abs(face.normal[b]);
+        });
+
+        var v1 = geometry.vertices[face.a];
+        var v2 = geometry.vertices[face.b];
+        var v3 = geometry.vertices[face.c];
+
+        geometry.faceVertexUvs[0].push([
+            new THREE.Vector2(v1[components[0]], v1[components[1]]),
+            new THREE.Vector2(v2[components[0]], v2[components[1]]),
+            new THREE.Vector2(v3[components[0]], v3[components[1]])
+        ]);
+
+    });
+
+    geometry.uvsNeedUpdate = true;
 }
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