Material issues when applied to EllipsoidGeometry

[bagnell]

Using this code in the Sandcastle with a viewer:

    var scene = viewer.scene;
    var primitives = scene.getPrimitives();
    var ellipsoid = viewer.centralBody.getEllipsoid();

    // Create ellipsoid and place with model matrix
    var radii = new Cesium.Cartesian3(200000.0, 200000.0, 300000.0);
    var positionOnEllipsoid = ellipsoid.cartographicToCartesian(Cesium.Cartographic.fromDegrees(-100.0, 40.0));
    var modelMatrix = Cesium.Matrix4.multiplyByTranslation(
        Cesium.Transforms.eastNorthUpToFixedFrame(positionOnEllipsoid),
        new Cesium.Cartesian3(0.0, 0.0, radii.z)
    );

    var ellipsoidGeometry = new Cesium.EllipsoidGeometry({
        vertexFormat : Cesium.MaterialAppearance.MaterialSupport.ALL.vertexFormat,
        radii : radii
    });
    var ellipsoidInstance = new Cesium.GeometryInstance({
        geometry : ellipsoidGeometry,
        modelMatrix : modelMatrix
    });
    primitives.add(new Cesium.Primitive({
        geometryInstances : ellipsoidInstance,
        appearance : new Cesium.MaterialAppearance({
            material : Cesium.Material.fromType(Cesium.Material.GridType),
            materialSupport : Cesium.MaterialAppearance.MaterialSupport.ALL,
            translucent : true,
            closed : true
        })
    }));

You will see: