Merge pull request #11039 from amvmoody/21477

WL 21477 Gravity Script

unpublishedScripts/gravity.js

@@ -0,0 +1,56 @@
+//
+//  gravity.js
+//
+//  Created by Alan-Michael Moody on 7/24/17
+//  Copyright 2017 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+(function () {
+
+    var _entityID;
+
+    this.preload = function (entityID) {
+        _entityID = entityID;
+    };
+
+    function update(deltatime) {
+        var planet = Entities.getEntityProperties(_entityID);
+
+        //normalization happens in rotationBetween.
+        var direction = Vec3.subtract(MyAvatar.position, planet.position);
+        var localUp = Quat.getUp(MyAvatar.orientation);
+
+        MyAvatar.orientation = Quat.normalize(Quat.multiply(Quat.rotationBetween(localUp, direction), MyAvatar.orientation));
+    }
+
+    function init() {
+        Script.update.connect(update);
+    }
+
+    function clean() {
+        Script.update.disconnect(update);
+        MyAvatar.orientation = Quat.fromVec3Degrees({
+            x: 0,
+            y: 0,
+            z: 0
+        });
+    }
+
+    var _switch = true;
+
+    this.clickDownOnEntity = function(uuid, mouseEvent) {
+
+        if (_switch) {
+            init();
+        } else {
+            clean();
+        }
+        _switch = !_switch;
+    };
+
+    Script.scriptEnding.connect(clean);
+
+});