MchCesium.viewer.entities.add 添加实体

参数说明：

entity(Object): 实体。实体可为点标注，多边形，billboard，label等

代码示例：

<div id="container"></div> <script> const view3D = MchCesium.init('container', true); MchCesium.viewer.entities.add({ name: '3D Tiles', position: Cesium.Cartesian3.fromDegrees(104.461479, 31.83257, 0), billboard: { image: 'https://mhc.ixera.com/img/bz.png', width: 30, height: 35, }, }) </script>