Using Camera.lookAt followed by camera.setView breaks mouse controls

[slozier]

It looks like by doing the following, the camera.position will be set to (0, 0, 0) and then trying to adjust the camera using the mouse will cause a failure:

viewer.camera.lookAt(Cesium.Cartesian3.fromDegrees(15, 0, 100), new Cesium.HeadingPitchRange(0, 0, 100));
viewer.camera.setView({destination: Cesium.Cartesian3.fromDegrees(15, 0, 100)});

// then try to adjust the camera using the mouse

Using sandcastle it gives this error:

DeveloperError: normalized result is not a number
DeveloperError@https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:540:19
Cartesian3.normalize@https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:8139:19
rotateVertical@https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:188049:17
Camera.prototype.rotateUp@https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:188040:9
rotate3D@https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:233530:13
spin3D@https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:233409:13
reactToInput@https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:232513:21
update3D@https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:234040:9
ScreenSpaceCameraController.prototype.update@https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:234075:13
Scene.prototype.initializeFrame@https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:239589:9 
CesiumWidget.prototype.render@https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:250532:13
render@https://cesiumjs.org/Cesium/Build/CesiumUnminified/Cesium.js:249915:25

[hpinkos]

Thanks for reporting this @slozier!