var viewer = new Cesium.Viewer('cesiumContainer');
var scene = viewer.scene;
var globe = scene.globe;
globe.depthTestAgainstTerrain = true;

var cesiumTerrainProviderHeightmaps = new Cesium.CesiumTerrainProvider({
    url : '//assets.agi.com/stk-terrain/world',
    requestWaterMask: true,
    requestVertexNormals: true
});

viewer.terrainProvider = cesiumTerrainProviderHeightmaps;

for(var iLp=0; iLp<3000; iLp++ ) {
    scene.primitives.add(new Cesium.Primitive({
        geometryInstances : new Cesium.GeometryInstance({
            geometry : Cesium.BoxGeometry.fromDimensions({
                vertexFormat : Cesium.PerInstanceColorAppearance.VERTEX_FORMAT,
                dimensions : new Cesium.Cartesian3(40000.0, 30000.0, 50000.0)
            }),
            modelMatrix : Cesium.Matrix4.multiplyByTranslation(
                Cesium.Transforms.eastNorthUpToFixedFrame(Cesium.Cartesian3.fromDegrees(-111.0+iLp, (iLp/100))),
                new Cesium.Cartesian3(0.0, 0.0, 250000), new Cesium.Matrix4()),
            attributes : {
                color : Cesium.ColorGeometryInstanceAttribute.fromColor(Cesium.Color.RED.withAlpha(0.5))
            }
        }),
        appearance : new Cesium.PerInstanceColorAppearance({
            closed: true
        })
    }));
}