diff --git a/package-lock.json b/package-lock.json
index 1db459a..5b4e5d0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,6 +10,7 @@
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+            "version": "7.13.10",
+            "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.13.10.tgz",
+            "integrity": "sha512-4VO883+MWPDUVRF3PhiLBUFHoX/bsLTGFpFK/HqvvfBZz2D57u9XzPVNFVBTc0PW/CWR9BXTOKt8NF4DInUHcQ==",
             "dev": true,
             "requires": {
                 "@babel/template": "^7.12.13",
@@ -6888,9 +6888,9 @@
             }
         },
         "@babel/highlight": {
-            "version": "7.13.8",
-            "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.13.8.tgz",
-            "integrity": "sha512-4vrIhfJyfNf+lCtXC2ck1rKSzDwciqF7IWFhXXrSOUC2O5DrVp+w4c6ed4AllTxhTkUP5x2tYj41VaxdVMMRDw==",
+            "version": "7.13.10",
+            "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.13.10.tgz",
+            "integrity": "sha512-5aPpe5XQPzflQrFwL1/QoeHkP2MsA4JCntcXHRhEsdsfPVkvPi2w7Qix4iV7t5S/oC9OodGrggd8aco1g3SZFg==",
             "dev": true,
             "requires": {
                 "@babel/helper-validator-identifier": "^7.12.11",
@@ -6899,9 +6899,9 @@
             }
         },
         "@babel/parser": {
-            "version": "7.13.9",
-            "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.13.9.tgz",
-            "integrity": "sha512-nEUfRiARCcaVo3ny3ZQjURjHQZUo/JkEw7rLlSZy/psWGnvwXFtPcr6jb7Yb41DVW5LTe6KRq9LGleRNsg1Frw==",
+            "version": "7.13.10",
+            "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.13.10.tgz",
+            "integrity": "sha512-0s7Mlrw9uTWkYua7xWr99Wpk2bnGa0ANleKfksYAES8LpWH4gW1OUr42vqKNf0us5UQNfru2wPqMqRITzq/SIQ==",
             "dev": true
         },
         "@babel/plugin-proposal-async-generator-functions": {
@@ -7395,9 +7395,9 @@
             }
         },
         "@babel/plugin-transform-runtime": {
-            "version": "7.13.9",
-            "resolved": "https://registry.npmjs.org/@babel/plugin-transform-runtime/-/plugin-transform-runtime-7.13.9.tgz",
-            "integrity": "sha512-XCxkY/wBI6M6Jj2mlWxkmqbKPweRanszWbF3Tyut+hKh+PHcuIH/rSr/7lmmE7C3WW+HSIm2GT+d5jwmheuB0g==",
+            "version": "7.13.10",
+            "resolved": "https://registry.npmjs.org/@babel/plugin-transform-runtime/-/plugin-transform-runtime-7.13.10.tgz",
+            "integrity": "sha512-Y5k8ipgfvz5d/76tx7JYbKQTcgFSU6VgJ3kKQv4zGTKr+a9T/KBvfRvGtSFgKDQGt/DBykQixV0vNWKIdzWErA==",
             "dev": true,
             "requires": {
                 "@babel/helper-module-imports": "^7.12.13",
@@ -7474,13 +7474,13 @@
             }
         },
         "@babel/preset-env": {
-            "version": "7.13.9",
-            "resolved": "https://registry.npmjs.org/@babel/preset-env/-/preset-env-7.13.9.tgz",
-            "integrity": "sha512-mcsHUlh2rIhViqMG823JpscLMesRt3QbMsv1+jhopXEb3W2wXvQ9QoiOlZI9ZbR3XqPtaFpZwEZKYqGJnGMZTQ==",
+            "version": "7.13.10",
+            "resolved": "https://registry.npmjs.org/@babel/preset-env/-/preset-env-7.13.10.tgz",
+            "integrity": "sha512-nOsTScuoRghRtUsRr/c69d042ysfPHcu+KOB4A9aAO9eJYqrkat+LF8G1yp1HD18QiwixT2CisZTr/0b3YZPXQ==",
             "dev": true,
             "requires": {
                 "@babel/compat-data": "^7.13.8",
-                "@babel/helper-compilation-targets": "^7.13.8",
+                "@babel/helper-compilation-targets": "^7.13.10",
                 "@babel/helper-plugin-utils": "^7.13.0",
                 "@babel/helper-validator-option": "^7.12.17",
                 "@babel/plugin-proposal-async-generator-functions": "^7.13.8",
@@ -7563,9 +7563,9 @@
             }
         },
         "@babel/runtime": {
-            "version": "7.13.9",
-            "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.13.9.tgz",
-            "integrity": "sha512-aY2kU+xgJ3dJ1eU6FMB9EH8dIe8dmusF1xEku52joLvw6eAFN0AI+WxCLDnpev2LEejWBAy2sBvBOBAjI3zmvA==",
+            "version": "7.13.10",
+            "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.13.10.tgz",
+            "integrity": "sha512-4QPkjJq6Ns3V/RgpEahRk+AGfL0eO6RHHtTWoNNr5mO49G6B5+X6d6THgWEAvTrznU5xYpbAlVKRYcsCgh/Akw==",
             "dev": true,
             "requires": {
                 "regenerator-runtime": "^0.13.4"
@@ -7651,9 +7651,9 @@
             }
         },
         "@types/eslint": {
-            "version": "7.2.6",
-            "resolved": "https://registry.npmjs.org/@types/eslint/-/eslint-7.2.6.tgz",
-            "integrity": "sha512-I+1sYH+NPQ3/tVqCeUSBwTE/0heyvtXqpIopUUArlBm0Kpocb8FbMa3AZ/ASKIFpN3rnEx932TTXDbt9OXsNDw==",
+            "version": "7.2.7",
+            "resolved": "https://registry.npmjs.org/@types/eslint/-/eslint-7.2.7.tgz",
+            "integrity": "sha512-EHXbc1z2GoQRqHaAT7+grxlTJ3WE2YNeD6jlpPoRc83cCoThRY+NUWjCUZaYmk51OICkPXn2hhphcWcWXgNW0Q==",
             "dev": true,
             "requires": {
                 "@types/estree": "*",
@@ -7701,9 +7701,9 @@
             "peer": true
         },
         "@types/node": {
-            "version": "14.14.31",
-            "resolved": "https://registry.npmjs.org/@types/node/-/node-14.14.31.tgz",
-            "integrity": "sha512-vFHy/ezP5qI0rFgJ7aQnjDXwAMrG0KqqIH7tQG5PPv3BWBayOPIQNBjVc/P6hhdZfMx51REc6tfDNXHUio893g==",
+            "version": "14.14.32",
+            "resolved": "https://registry.npmjs.org/@types/node/-/node-14.14.32.tgz",
+            "integrity": "sha512-/Ctrftx/zp4m8JOujM5ZhwzlWLx22nbQJiVqz8/zE15gOeEW+uly3FSX4fGFpcfEvFzXcMCJwq9lGVWgyARXhg==",
             "dev": true
         },
         "@types/normalize-package-data": {
@@ -7900,9 +7900,9 @@
             "dev": true
         },
         "acorn": {
-            "version": "8.0.5",
-            "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.0.5.tgz",
-            "integrity": "sha512-v+DieK/HJkJOpFBETDJioequtc3PfxsWMaxIdIwujtF7FEV/MAyDQLlm6/zPvr7Mix07mLh6ccVwIsloceodlg==",
+            "version": "8.1.0",
+            "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.1.0.tgz",
+            "integrity": "sha512-LWCF/Wn0nfHOmJ9rzQApGnxnvgfROzGilS8936rqN/lfcYkY9MYZzdMqN+2NJ4SlTc+m5HiSa+kNfDtI64dwUA==",
             "dev": true
         },
         "adjust-sourcemap-loader": {
@@ -8200,9 +8200,9 @@
             }
         },
         "caniuse-lite": {
-            "version": "1.0.30001196",
-            "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001196.tgz",
-            "integrity": "sha512-CPvObjD3ovWrNBaXlAIGWmg2gQQuJ5YhuciUOjPRox6hIQttu8O+b51dx6VIpIY9ESd2d0Vac1RKpICdG4rGUg==",
+            "version": "1.0.30001197",
+            "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001197.tgz",
+            "integrity": "sha512-8aE+sqBqtXz4G8g35Eg/XEaFr2N7rd/VQ6eABGBmNtcB8cN6qNJhMi6oSFy4UWWZgqgL3filHT8Nha4meu3tsw==",
             "dev": true
         },
         "caseless": {
@@ -8667,9 +8667,9 @@
             }
         },
         "electron-to-chromium": {
-            "version": "1.3.681",
-            "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.3.681.tgz",
-            "integrity": "sha512-W6uYvSUTHuyX2DZklIESAqx57jfmGjUkd7Z3RWqLdj9Mmt39ylhBuvFXlskQnvBHj0MYXIeQI+mjiwVddZLSvA==",
+            "version": "1.3.683",
+            "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.3.683.tgz",
+            "integrity": "sha512-8mFfiAesXdEdE0DhkMKO7W9U6VU/9T3VTWwZ+4g84/YMP4kgwgFtQgUxuu7FUMcvSeKSNhFQNU+WZ68BQTLT5A==",
             "dev": true
         },
         "emoji-regex": {
@@ -8704,9 +8704,9 @@
             }
         },
         "env-paths": {
-            "version": "2.2.0",
-            "resolved": "https://registry.npmjs.org/env-paths/-/env-paths-2.2.0.tgz",
-            "integrity": "sha512-6u0VYSCo/OW6IoD5WCLLy9JUGARbamfSavcNXry/eu8aHVFei6CD3Sw+VGX5alea1i9pgPHW0mbu6Xj0uBh7gA==",
+            "version": "2.2.1",
+            "resolved": "https://registry.npmjs.org/env-paths/-/env-paths-2.2.1.tgz",
+            "integrity": "sha512-+h1lkLKhZMTYjog1VEpJNG7NZJWcuc2DDk/qsqSTRRCOXiLjeQ1d1/udrUGhqMxUgAlwKNZ0cf2uqan5GLuS2A==",
             "dev": true
         },
         "envinfo": {
@@ -8846,9 +8846,9 @@
             },
             "dependencies": {
                 "type": {
-                    "version": "2.3.0",
-                    "resolved": "https://registry.npmjs.org/type/-/type-2.3.0.tgz",
-                    "integrity": "sha512-rgPIqOdfK/4J9FhiVrZ3cveAjRRo5rsQBAIhnylX874y1DX/kEKSVdLsnuHB6l1KTjHyU01VjiMBHgU2adejyg==",
+                    "version": "2.5.0",
+                    "resolved": "https://registry.npmjs.org/type/-/type-2.5.0.tgz",
+                    "integrity": "sha512-180WMDQaIMm3+7hGXWf12GtdniDEy7nYcyFMKJn/eZz/6tSLXrUN9V0wKSbMjej0I1WHWbpREDEKHtqPQa9NNw==",
                     "dev": true
                 }
             }
@@ -9102,9 +9102,9 @@
             }
         },
         "glob-parent": {
-            "version": "5.1.1",
-            "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-5.1.1.tgz",
-            "integrity": "sha512-FnI+VGOpnlGHWZxthPGR+QhR78fuiK0sNLkHQv+bL9fQi57lNNdquIbna/WrfROrolq8GK5Ek6BiMwqL/voRYQ==",
+            "version": "5.1.2",
+            "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-5.1.2.tgz",
+            "integrity": "sha512-AOIgSQCepiJYwP3ARnGx+5VnTu2HBYdzbGP45eLw1vr3zB3vZLeyed1sC9hnbcOc9/SrMyM5RPQrkGz4aS9Zow==",
             "dev": true,
             "peer": true,
             "requires": {
@@ -9615,8 +9615,7 @@
         "lodash": {
             "version": "4.17.21",
             "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
-            "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==",
-            "dev": true
+            "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="
         },
         "lodash.debounce": {
             "version": "4.0.8",
@@ -11404,9 +11403,9 @@
             "dev": true
         },
         "v8-compile-cache": {
-            "version": "2.2.0",
-            "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.2.0.tgz",
-            "integrity": "sha512-gTpR5XQNKFwOd4clxfnhaqvfqMpqEwr4tOtCyz4MtYZX2JYhfr1JvBFKdS+7K/9rfpZR3VLX+YWBbKoxCgS43Q==",
+            "version": "2.3.0",
+            "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.3.0.tgz",
+            "integrity": "sha512-l8lCEmLcLYZh4nbunNZvQCJc5pv7+RCwa8q/LdUx8u7lsWvPDKmpodJAJNwkAhJC//dFY48KuIEmjtd4RViDrA==",
             "dev": true
         },
         "validate-npm-package-license": {
@@ -11441,9 +11440,9 @@
             }
         },
         "webpack": {
-            "version": "5.24.3",
-            "resolved": "https://registry.npmjs.org/webpack/-/webpack-5.24.3.tgz",
-            "integrity": "sha512-x7lrWZ7wlWAdyKdML6YPvfVZkhD1ICuIZGODE5SzKJjqI9A4SpqGTjGJTc6CwaHqn19gGaoOR3ONJ46nYsn9rw==",
+            "version": "5.24.4",
+            "resolved": "https://registry.npmjs.org/webpack/-/webpack-5.24.4.tgz",
+            "integrity": "sha512-RXOdxF9hFFFhg47BryCgyFrEyyu7Y/75/uiI2DoUiTMqysK+WczVSTppvkR47oZcmI/DPaXCiCiaXBP8QjkNpA==",
             "dev": true,
             "requires": {
                 "@types/eslint-scope": "^3.7.0",
diff --git a/package.json b/package.json
index 804f1c8..864e88c 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,7 @@
     "main": "dist/main.js",
     "dependencies": {
         "@fortawesome/fontawesome-free": "^5.15.2",
+        "lodash": "^4.17.21",
         "normalize.css": "^8.0.1",
         "proj4": "^2.6.3",
         "three": "^0.126.0"
diff --git a/src/js/clip/Picking.js b/src/js/clip/Picking.js
index ae19349..fa08bb9 100644
--- a/src/js/clip/Picking.js
+++ b/src/js/clip/Picking.js
@@ -98,11 +98,12 @@ export class Picking {
                 if (this.intersected !== null) {
                     this.intersected.guardian.rayOut();
                 }
+                // select yellow color
                 candidate.guardian.rayOver();
                 this.intersected = candidate;
                 this.simulation.renderer.domElement.style.cursor = 'pointer';
                 // this.simulation.throttledRender();
-                this.simulation.animate();
+                this.simulation.deferringThrottle();
             }
 
         } else if (this.intersected !== null) {
@@ -111,7 +112,7 @@ export class Picking {
             this.intersected = null;
             this.simulation.renderer.domElement.style.cursor = 'auto';
             // this.simulation.throttledRender();
-            this.simulation.animate();
+            this.simulation.deferringThrottle();
         }
     }
 
@@ -160,7 +161,7 @@ export class Picking {
             this.plane.lookAt(newNormal.add(intersectionPoint));
             this.simulation.renderer.domElement.style.cursor = 'grab';
             // simulation.throttledRender();
-            this.simulation.animate();
+            this.simulation.deferringThrottle();
 
             let continueDrag = function (event) {
                 event.preventDefault();
@@ -187,7 +188,7 @@ export class Picking {
                     this.simulation.selection.setValue(axis, value);
                     // this.simulation.selection.setValue('x1', 4452960);
                     // this.simulation.throttledRender();
-                    this.simulation.animate();
+                    this.simulation.deferringThrottle();
                 }
 
             };
diff --git a/src/js/clip/Selection.js b/src/js/clip/Selection.js
index 07b7392..3a9fb43 100644
--- a/src/js/clip/Selection.js
+++ b/src/js/clip/Selection.js
@@ -7,6 +7,7 @@ import { uniforms } from "./uniforms";
 import { SelectionBoxFace } from './SelectionBoxFace';
 import { SelectionBoxLine } from './SelectionBoxLine';
 import { Layer } from '../layer/Layer';
+import { Group } from 'three/src/objects/Group';
 
 export class Selection extends Layer {
     limitLow;
@@ -33,7 +34,9 @@ export class Selection extends Layer {
             x1: low.x,
             y1: low.y,
             x2: high.x,
-            y2: high.y
+            y2: high.y,
+            z1: low.z - 5000,
+            z2: high.z + 5000
         }
         this.scale = 1;
 
@@ -50,8 +53,8 @@ export class Selection extends Layer {
 
         let v = this.vertices;
 
-        this.touchMeshes = new Object3D();
-        this.displayMeshes = new Object3D();
+        this.touchMeshes = new Group(); //Object3D();
+        this.displayMeshes = new Group(); // Object3D();
         this.meshGeometries = [];
         this.lineGeometries = [];
         this.selectables = [];
@@ -93,7 +96,7 @@ export class Selection extends Layer {
     build(app_scene) {
         // app_scene.add(this.boxMesh);
         app_scene.add(this.displayMeshes);
-        app_scene.add(this.touchMeshes);
+        // app_scene.add(this.touchMeshes);
     }
 
     setWireframeMode(wireframe) {
@@ -112,6 +115,7 @@ export class Selection extends Layer {
         this.scale = z;
         // this.boxMesh.scale.z = z;
         // this.displayMeshes.scale.z = z;
+        this.displayMeshes.scale.set(1, 1, z);
         // this.touchMeshes.scale.z = z;
     }
 
@@ -155,7 +159,7 @@ export class Selection extends Layer {
     setBox() {
         let width = new Vector3();
         width.subVectors(this.limitHigh, this.limitLow);
-        this.boxMesh.scale.copy(width);           
+        this.boxMesh.scale.copy(width);
         width.multiplyScalar(0.5).add(this.limitLow);
         this.boxMesh.position.copy(width);
     }
@@ -177,7 +181,7 @@ export class Selection extends Layer {
 
     setValue(axis, value) {
         let buffer = 1000;
-        let limit = 14000;
+        // let limit = 14000;
 
         if (axis === 'x1') {
             // this.limitLow.x = Math.max(-limit, Math.min(this.limitHigh.x - buffer, value));            
@@ -192,9 +196,11 @@ export class Selection extends Layer {
             // this.limitHigh.y = Math.max(this.limitLow.y + buffer, Math.min(limit, value));          
             this.limitHigh.y = Math.max(this.limitLow.y + buffer, Math.min(this.limit.y2, value));
         } else if (axis === 'z1') {
-            this.limitLow.z = Math.max(-limit, Math.min(this.limitHigh.z - buffer, value));
+            // this.limitLow.z = Math.max(-limit, Math.min(this.limitHigh.z - buffer, value));
+            this.limitLow.z = Math.max(this.limit.z1, Math.min(this.limitHigh.z - buffer, value));
         } else if (axis === 'z2') {
-            this.limitHigh.z = Math.max(this.limitLow.z + buffer, Math.min(limit, value));
+            // this.limitHigh.z = Math.max(this.limitLow.z + buffer, Math.min(limit, value));
+            this.limitHigh.z = Math.max(this.limitLow.z + buffer, Math.min(this.limit.z2, value));
         }
 
         this.setBox();
diff --git a/src/js/main.js b/src/js/main.js
index 955ac6a..815d6db 100644
--- a/src/js/main.js
+++ b/src/js/main.js
@@ -25,6 +25,7 @@ import { MobileDialog } from "./controls/MobileDialog";
 import { Picking } from './clip/Picking';
 
 import { Selection } from './clip/Selection';
+import _ from "lodash";
 
 import '../css/page.scss'; /* style loader will import it */
 
@@ -352,6 +353,8 @@ class Application {
         this.animate();
     }
 
+    deferringThrottle = _.throttle(this.animate, 40);
+
     animate() {
         this.renderer.clear();