viewExtent changed in b25

[chris-cooper]

The camera used to look straight down in b24 but now looks at an angle in b25. This can be reproduced by navigating to the Hello World Sandcastle and entering the following code...

var viewer = new Cesium.Viewer('cesiumContainer');

var frameAustralia = function(viewer) {
    var west = Cesium.Math.toRadians(90.0);
    var south = Cesium.Math.toRadians(-50.0);
    var east = Cesium.Math.toRadians(157.0);
    var north = Cesium.Math.toRadians(0.0);
    var extent = new Cesium.Extent(west, south, east, north);
    viewer.scene.getCamera().controller.viewExtent(extent);
};

frameAustralia(viewer);

[pjcozzi]

I'm pretty sure this is by design because we changed a geocentric normal to a geodetic, but @bagnell can confirm.

[kring]

Nah, something is wrong. Looking down the geodetic normal should appear to be "straight down" and even looking down the geocentric normal would look less skewed than that.

[kring]

Also notice that middle mouse rotate is totally messed up after the viewExtent.

[pjcozzi]

@bagnell please have a look.