var tileset = viewer.scene.primitives.add(new Cesium.Cesium3DTileset({
        url: './data/meta',
        cullWithChildrenBounds: true,
    }));


    tileset.style = new Cesium.Cesium3DTileStyle({
        pointSize: 2,
        color: 'color("red")',
    })

    function getPoint(typedArray, index, { isQuantized = false, rtcCenter = null, quantized: { scale, offset } }) {
        let positionX = typedArray[index * 3],
            positionY = typedArray[(index * 3) + 1],
            positionZ = typedArray[(index * 3) + 2];
        if (rtcCenter != null) {
            positionX += rtcCenter.x;
            positionY += rtcCenter.y;
            positionZ += rtcCenter.z;
        } else if (isQuantized) {
            positionX = positionX * scale.x / SHORT_CAPACITY + offset.x;
            positionY = positionY * scale.y / SHORT_CAPACITY + offset.y;
            positionZ = positionZ * scale.z / SHORT_CAPACITY + offset.z;
        }
        return new Cesium.Cartesian3(positionX, positionY, positionZ);
    }


    tileset.tileLoad.addEventListener(tile => {
        // highjack the cesium tile loading process
        tile._contentState = Cesium.Cesium3DTileContentState.PROCESSING;
        const { _quantizedVolumeOffset: offset, _quantizedVolumeScale: scale, _parsedContent: { positions } } = tile._content;
        const cartographicPositions = [], options = { isQuantized: true,  quantized: { scale, offset }};
        for (let idx = 0; idx < positions.length / 3; idx++)
            cartographicPositions.push(Cesium.Cartographic.fromCartesian(getPoint(positions, idx, options)))


        Cesium.sampleTerrainMostDetailed(terrainProvider, cartographicPositions).then(updatedPoints => {
            //completed height re-quanitzation
            console.log(cartographicPositions);
            tile._contentState = Cesium.Cesium3DTileContentState.READY;
        });


    });