diff --git a/src/add/three.js b/src/add/three.js
index d6548552..366b2bf3 100644
--- a/src/add/three.js
+++ b/src/add/three.js
@@ -23,6 +23,23 @@
         return cb;
     };
 
+    THREE.dispose = function(obj) {
+        if (!obj) {
+            return;
+        }
+        if (obj.geometry) {
+            obj.geometry.dispose();
+        }
+        if (obj.material && obj.material.map && obj.material.map.dispose) {
+            obj.material.map.dispose();
+        }
+        if (obj.children && obj.children.length) {
+            for (let c of obj.children) {
+                THREE.dispose(c);
+            }
+        }
+    };
+
     // add .dim and .mid getters to Box3
     Object.defineProperties(XP, {
         dim: {
diff --git a/src/kiri/stack.js b/src/kiri/stack.js
index 258825c3..14400926 100644
--- a/src/kiri/stack.js
+++ b/src/kiri/stack.js
@@ -33,6 +33,7 @@
 
         destroy() {
             this._view.remove(this.view);
+            THREE.dispose(this.view);
             this.view = this.slices = this.meshes = null;
         }
 
diff --git a/src/kiri/stacks.js b/src/kiri/stacks.js
index dce39e29..6c618e45 100644
--- a/src/kiri/stacks.js
+++ b/src/kiri/stacks.js
@@ -112,9 +112,11 @@
             },
             remove: function() {
                 view.remove(stack.obj.view);
+                THREE.dispose(stack.obj.view);
             },
             clear: function() {
                 view.remove(stack.obj.view);
+                THREE.dispose(stack.obj.view);
             },
             button: function(label, action) {
                 UC.newRow([ UC.newButton(label, action) ]);
diff --git a/src/moto/space.js b/src/moto/space.js
index 0ef22f6f..d7354e7f 100644
--- a/src/moto/space.js
+++ b/src/moto/space.js
@@ -685,6 +685,7 @@
 
         SCENE.remove(current);
         SCENE.add(platform);
+        THREE.dispose(current);
     }
 
     function refresh() {
@@ -1049,13 +1050,27 @@
             },
 
             remove: function (o) {
+                THREE.dispose(o);
                 return SCENE.remove(o);
             },
 
             active: updateLastAction
         },
 
-        world: WORLD,
+        world: {
+            add: function(o) {
+                return WORLD.add(o);
+            },
+
+            remove: function(o) {
+                THREE.dispose(o);
+                return WORLD.remove(o);
+            },
+
+            newGroup: function() {
+                return WORLD.newGroup();
+            }
+        },
 
         platform: {
             set:        setPlatform,
@@ -1159,15 +1174,16 @@
             setDelay:   (d) => { tweenDelay = d || 20 }
         },
 
-        useDefaultKeys: (b) => { defaultKeys = b  },
-        selectRecurse:  (b) => { selectRecurse = b },
-        objects:        () => { return WORLD.children },
+        useDefaultKeys  (b)    { defaultKeys = b  },
+        selectRecurse   (b)    { selectRecurse = b },
+        renderInfo      ()     { return renderer.info },
+        objects         ()     { return WORLD.children },
 
-        screenshot: (format, options) => {
+        screenshot(format, options) {
             return renderer.domElement.toDataURL(format || "image/png", options);
         },
 
-        screenshot2: (param = {}) => {
+        screenshot2(param = {}) {
             let oco = renderer.domElement;
             let oWidth = oco.offsetWidth;
             let oHeight = oco.offsetHeight;
@@ -1203,7 +1219,6 @@
                 preserveDrawingBuffer: true,
                 logarithmicDepthBuffer: true
             });
-            console.log({renderer});
             camera = ortho ?
                 new THREE.OrthographicCamera(-100 * aspect(), 100 * aspect(), 100, -100, 0.1, 100000) :
                 new THREE.PerspectiveCamera(perspective, aspect(), 0.1, 100000);