2D/Columbus-view artifact with extent geometries at the pole

[pjcozzi]

From https://groups.google.com/forum/#!forum/cesium-dev

In the Geometry and Appearances Sandcastle example, replace Line 119 with

extent = Cesium.Extent.fromDegrees(-180.0, 45.0, -160.0, 90.0);

Given that 90.0 is at the pole, we get artifacts in 2D and columbus view.

3D:

2D:

Using 89.99 instead of 90.0 does not cause artifacts.

Perhaps the geometry is optimizing for this in 3D and not introducing a northern row. If that's the case, we can pass an allow3DOnly option that defaults to false.

[hpinkos]

var viewer = new Cesium.Viewer('cesiumContainer', {
    sceneMode: Cesium.SceneMode.SCENE2D
});
viewer.entities.add({
    rectangle : {
        coordinates : Cesium.Rectangle.fromDegrees(-180.0, 45.0, -160.0, 90.0),
        outline : true,
        outlineColor : Cesium.Color.WHITE,
        material : Cesium.Color.BLUE,
        height : 0.0
    }
});