stub in placeholder for fdm animation

src/kiri/main.js

@@ -287,7 +287,7 @@
             slice: prepareSlices,
             print: preparePreview,
             prepare: preparePreview,
-            animate: noop,
+            animate: prepareAnimation,
             export: prepareExport,
             cancel: cancelWorker,
             clear: KIRI.client.clear,
@@ -1221,6 +1221,10 @@
         });
     }
 
+    function prepareAnimation() {
+        API.event.emit("function.animate", {mode: settings.mode});
+    }
+
     function prepareExport() {
         const argsave = arguments;
         if (!complete.preview) {

src/kiri/stack.js

@@ -49,6 +49,7 @@
         }
 
         setLastFraction(frac = 1) {
+            if (this.lastVis)
             for (let mesh of this.lastVis.children) {
                 let geo = mesh.geometry;
                 let pos = geo.attributes.position;