viewer.flyTo and viewer.zoomTo give different results in 2D and CV

[mramato]

flyTo always orients north, but zoomTo applies the specified heading. The doc seems to indicate this is by design (at least for 2D). But it also happens for CV. Why do it at all? I think flyTo should take the heading into account, just like zoomTo does.

While the below example uses the viewer commands, the actual behavior is defined in the camera.flyToBoundingSphere method.

var viewer = new Cesium.Viewer('cesiumContainer', { sceneMode : Cesium.SceneMode.SCENE2D });

var redRectangle = viewer.entities.add({
    name : 'Red translucent rectangle with outline',
    rectangle : {
        coordinates : Cesium.Rectangle.fromDegrees(-110.0, 20.0, -80.0, 25.0),
        material : Cesium.Color.RED.withAlpha(0.5),
        outline : true,
        outlineColor : Cesium.Color.RED
    }
});

Sandcastle.addToolbarButton('zoomTo', function() {
    viewer.zoomTo(redRectangle, new Cesium.HeadingPitchRange(Math.PI / 2, -Math.PI / 4, 4000000));
});

Sandcastle.addToolbarButton('flyTo', function() {
    viewer.flyTo(redRectangle, {
        offset : new Cesium.HeadingPitchRange(Math.PI / 2, -Math.PI / 4, 4000000)
    });
});

[hpinkos]

This came up on the forum: https://groups.google.com/forum/?hl=en#!topic/cesium-dev/EbCim-p6jmI

[hpinkos]

We need different behavior for mapMode2D: Cesium.MapMode2D.ROTATE. Right now, zoomTo rotates the map but flyTo does not. It should rotate the map for both if Cesium.MapMode2D.ROTATE and neither otherwise

[hpinkos]

Also reported here: https://groups.google.com/forum/?hl=en#!searchin/cesium-dev/wrong$20viewpoint%7Csort:date/cesium-dev/MSPOj17Iqcg/dtbDsrUdBgAJ