fix some slider issues

src/kiri/main.js

@@ -686,8 +686,7 @@
         API.conf.save();
         API.event.emit('slice.begin', getMode());
 
-        let firstMesh = true,
-            countdown = WIDGETS.length,
+        let countdown = WIDGETS.length,
             totalProgress,
             track = {},
             mode = settings.mode,
@@ -720,11 +719,11 @@
                     if (lastMsg) segtimes[`${segNumber++}_${lastMsg}`] = mark - startTime;
                     segtimes.total = UTIL.time() - now;
                     API.event.emit('slice', getMode());
-                    firstMesh = false;
                 }
                 // on done
                 segtimes[`${segNumber}_draw`] = widget.render(stack);
                 updateSliderMax(true);
+                setVisibleLayer(-1, 0);
                 // clear wireframe
                 widget.setWireframe(false, color.wireframe, color.wireframe_opacity);
                 widget.setOpacity(camOrLaser ? color.cam_sliced_opacity : color.sliced_opacity);
@@ -828,7 +827,7 @@
             if (feature.preview) {
                 SPACE.update();
                 updateSliderMax(true);
-                showSlices();
+                setVisibleLayer(-1, 0);
             }
 
             if (typeof(callback) === 'function') {
@@ -1929,7 +1928,7 @@
                 KIRI.work.clear();
                 STACKS.clear();
                 hideSlider();
-                setVisibleLayer(0,0);
+                setVisibleLayer();
                 setWidgetVisibility(true);
                 setOpacity(1);
                 break;

src/mode/cam/prepare.js

@@ -35,7 +35,7 @@
 
         print.render = KIRI.driver.FDM.prepareRender(print.output, progress => {
             update(0.5 + progress * 0.5);
-        }, { thin: true, print: 0, move: 0x003366 });
+        }, { thin: true, print: 0, move: 0x003366, speed: false });
 
         return print.render;
     };

src/mode/fdm/prepare.js

@@ -385,6 +385,7 @@
         const opts = options || {};
         const tools = opts.tools || {};
         const thin = opts.thin || false;
+        const ckspeed = opts.speed !== false;
         const moveColor = opts.move >= 0 ? opts.move : 0xaaaaaa;
         const printColor = opts.print >= 0 ? opts.print : 0x777700;
         const layers = [];
@@ -420,7 +421,7 @@
                 }
                 if (lastOut) {
                     if (out.emit) {
-                        if (!lastOut.emit || out.speed !== lastOut.speed) {
+                        if (!lastOut.emit || (ckspeed && out.speed !== lastOut.speed)) {
                             current = newPolygon().setOpen();
                             current.push(lastOut.point);
                             current.color = hsv2rgb({h:out.speed/maxspd, s:1, v:1}, true);