change render control variable

src/kiri/engine.js

@@ -13,7 +13,7 @@ class Engine {
         this.settings = {
             mode: "FDM",
             controller: {},
-            internal: true,
+            render: false,
             filter: { FDM: "internal" },
             device: KIRI.conf.defaults.fdm.d, // device profile
             process: KIRI.conf.defaults.fdm.p, // slicing settings
@@ -52,6 +52,11 @@ class Engine {
         this.listener = listener;
     }
 
+    setRender(bool) {
+        this.settings.render = bool;
+        return this;
+    }
+
     setMode(mode) {
         this.settings.mode = mode;
         return this;

src/mode/fdm/prepare.js

@@ -21,7 +21,8 @@
     FDM.prepare = function(widgets, settings, update) {
         settings = FDM.fixExtruders(settings);
 
-        let device = settings.device,
+        let render = settings.render !== false,
+            device = settings.device,
             nozzle = device.extruders[0].extNozzle,
             process = settings.process,
             bounds = settings.bounds,
@@ -396,8 +397,8 @@
 
         print.output = output;
 
-        // render when not internal (engine api)
-        if (!settings.internal) {
+        // render if not explicitly disabled
+        if (render) {
             print.render = FDM.prepareRender(output, (progress, layer) => {
                 update(0.5 + progress * 0.5, "render", layer);
             }, { tools: device.extruders, thin: isThin, flat: isFlat, fdm: true });

src/mode/fdm/slice.js

@@ -56,7 +56,7 @@
      */
     FDM.slice = function(settings, widget, onupdate, ondone) {
         FDM.fixExtruders(settings);
-        let render = !settings.internal,
+        let render = settings.render !== false,
             spro = settings.process,
             sdev = settings.device,
             update_start = Date.now(),
@@ -259,7 +259,7 @@
                 }, "support");
             }
 
-            // skip rendering in api-only mode
+            // render if not explicitly disabled
             if (render) {
                 forSlices(0.9, 1.0, function(slice) {
                     doRender(slice);