Camera fields may be undefined if it is still morphing

CHANGES.md

@@ -13,6 +13,7 @@ Change Log
 * Fixed issue where `Camera.flyTo` does not go to the rectangle. [#3688](https://github.com/AnalyticalGraphicsInc/cesium/issues/3688)
 * Fixed issue causing the fog to go dark and the atmosphere to flicker when the camera clips the globe. [#3178](https://github.com/AnalyticalGraphicsInc/cesium/issues/3178)
 * Fixed a bug that caused an exception and rendering to stop when using `ArcGisMapServerImageryProvider` to connect to a MapServer specifying the Web Mercator projection and a fullExtent bigger than the valid extent of the projection. [#3854](https://github.com/AnalyticalGraphicsInc/cesium/pull/3854)
+* Fixed issue causing an exception when switching scene modes with an active KML network link. [#3865](https://github.com/AnalyticalGraphicsInc/cesium/issues/3865)
 
 ### 1.20 - 2016-04-01
 

Source/DataSources/KmlDataSource.js

@@ -34,6 +34,7 @@ define([
         '../Core/TimeIntervalCollection',
         '../Scene/HorizontalOrigin',
         '../Scene/LabelStyle',
+        '../Scene/SceneMode',
         '../ThirdParty/Autolinker',
         '../ThirdParty/Uri',
         '../ThirdParty/when',
@@ -91,6 +92,7 @@ define([
         TimeIntervalCollection,
         HorizontalOrigin,
         LabelStyle,
+        SceneMode,
         Autolinker,
         Uri,
         when,
@@ -1714,7 +1716,7 @@ define([
             return value;
         }
 
-        if (defined(camera)) {
+        if (defined(camera) && camera._mode !== SceneMode.MORPHING) {
             var wgs84 = Ellipsoid.WGS84;
             var centerCartesian;
             var centerCartographic;

Specs/DataSources/KmlDataSourceSpec.js

@@ -21,8 +21,11 @@ defineSuite([
         'DataSources/ColorMaterialProperty',
         'DataSources/EntityCollection',
         'DataSources/ImageMaterialProperty',
+        'Scene/Camera',
         'Scene/HorizontalOrigin',
         'Scene/LabelStyle',
+        'Scene/SceneMode',
+        'Specs/createCamera',
         'Specs/pollToPromise',
         'ThirdParty/when'
     ], function(
@@ -47,8 +50,11 @@ defineSuite([
         ColorMaterialProperty,
         EntityCollection,
         ImageMaterialProperty,
+        Camera,
         HorizontalOrigin,
         LabelStyle,
+        SceneMode,
+        createCamera,
         pollToPromise,
         when) {
     "use strict";
@@ -3714,4 +3720,28 @@ defineSuite([
             expect(console.log).toHaveBeenCalledWith('KML - refreshMode of onExpire requires the NetworkLinkControl to have an expires element');
         });
     });
+
+    it('NetworkLink: Heading and pitch can be undefined if the camera is in morphing mode', function() {
+        var kml = '<?xml version="1.0" encoding="UTF-8"?>\
+          <NetworkLink id="link">\
+            <Link>\
+              <href>./Data/KML/simple.kml</href>\
+              <refreshMode>onExpire</refreshMode>\
+            </Link>\
+          </NetworkLink>';
+
+        var camera = createCamera();
+        Camera.clone(options.camera, camera);
+
+        var kmlOptions = {
+            camera: camera,
+            canvas: options.canvas
+        };
+
+        camera._mode = SceneMode.MORPHING;
+
+        return KmlDataSource.load(parser.parseFromString(kml, "text/xml"), kmlOptions).then(function(dataSource) {
+            expect(dataSource.entities.values.length).toEqual(2);
+        });
+    });
 });