Cesium在3dtiles三维模型上添加标注

    let i = 0;
    PinBill.prototype.createBill = function () {
      let that = this;
      that.entity = viewer.entities.add({
        id: '实体' + i++,
        position: that.myPos,
        billboard: {
          image: that.myCanvas,
          scale: 0.4,
          verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
          disableDepthTestDistance: new Cesium.CallbackProperty((time, result) => {
            let cp = viewer.camera.positionWC.clone();
            let d = Cesium.Cartesian3.distance(cp, that.myPos);
            if (d < 60) {
              that.entity.billboard.eyeOffset=new Cesium.Cartesian3(0, 0, -d+1);
              return Number.POSITIVE_INFINITY;
            } else {
              return undefined;
            }
          }, false),
          eyeOffset: new Cesium.Cartesian3(0, 0, -50)
        }
      });
    }