解决方法：
function changeHeight(tileset, height) {

height = Number(height);

if (isNaN(height)) {

return;

}

var cartographic = Cesium.Cartographic.fromCartesian(tileset.boundingSphere.center);

var surface = Cesium.Cartesian3.fromRadians(cartographic.longitude, cartographic.latitude,

cartographic

.height);

var offset = Cesium.Cartesian3.fromRadians(cartographic.longitude, cartographic.latitude, height);

var translation = Cesium.Cartesian3.subtract(offset, surface, new Cesium.Cartesian3());

tileset.modelMatrix = Cesium.Matrix4.fromTranslation(translation);

}

1.开启深度监测 viewer.scene.globe.depthTestAgainstTerrain=true;

2.关闭深度监测 viewer.scene.globe.depthTestAgainstTerrain=false;