mramato

//Create's a 1x1 transparent base layer so that the globe has no imagery
var transparentBaseLayer = new Cesium.SingleTileImageryProvider({
    url : "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNgYAAAAAMAASsJTYQAAAAASUVORK5CYII="
});

//Create the viewer, must specify alpha :true in order for the globe and
//background to be transparent
var viewer = new Cesium.Viewer('cesiumContainer', {
    skyBox : false,
    skyAtmosphere : false,