Camera.computeViewRectangle is wrong for view that crosses the IDL

[hpinkos]

Reported on the forum: https://groups.google.com/forum/?hl=en#!topic/cesium-dev/8UgBBcmEM_U

The rectangle spans the opposite side of the globe. East and west need to be switched.

In this example, zoom to the IDL and click to visualize the rectangle.

var viewer = new Cesium.Viewer('cesiumContainer', {
    selectionIndicator : false,
    infoBox : false
});

viewer.entities.add({
    name : 'IDL',
    polyline : {
        positions : Cesium.Cartesian3.fromDegreesArray([-179.9, 80,
                                                        -179.9, -80]),
        width : 2,
        material : Cesium.Color.WHITE
    }
});

var entity;
var handler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);
handler.setInputAction(function() {
    viewer.entities.remove(entity);
    var rectangle = viewer.scene.camera.computeViewRectangle(viewer.scene.globe.ellipsoid);
    entity = viewer.entities.add({
        rectangle : {
            coordinates : rectangle,
            material : Cesium.Color.RED.withAlpha(0.5),
            outline : true,
            outlineColor : Cesium.Color.RED
        }
    });
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);

[hpinkos]

@tfili