Question

        const clusterDS = new Cesium.CustomDataSource("myData");
        clusterDS.clustering = new Cesium.EntityCluster({ enabled: true });
        viewer.dataSources.add(clusterDS);
        const addBillboard = () => {
          const lng = 122.06521 + Math.random() * 0.001;
          const lat = 40.74051 + Math.random() * 0.001;
          clusterDS.entities.add({
            position: Cesium.Cartesian3.fromDegrees(lng, lat, 0),
            billboard: {
              image: "./images/location4.png",
              height: 16,
              width: 16,
            },
            label: {
              text: "123",
            },
          });
        };
        const _cache = {};
        const _drawCircle = (color, numLength) => {
          const size = 18 * (numLength + 1);
          const key = color.toCssColorString() + "-" + size;
          if (!_cache[key]) {
            const canvas = document.createElement("canvas");
            canvas.width = size;
            canvas.height = size;
            const context2D = canvas.getContext("2d");
            context2D.save();
            context2D.scale(size / 24, size / 24); // Added to auto-generated code to scale up to desired size.
            context2D.fillStyle = color.withAlpha(0.2).toCssColorString(); // Modified from auto-generated code.
            context2D.beginPath();
            context2D.arc(12, 12, 9, 0, 2 * Math.PI);
            context2D.closePath();
            context2D.fill();
            context2D.beginPath();
            context2D.arc(12, 12, 6, 0, 2 * Math.PI);
            context2D.fillStyle = color.toCssColorString();
            context2D.fill();
            context2D.closePath();
            context2D.restore();
            _cache[key] = canvas.toDataURL();
          }
          return _cache[key];
        };
        const _clusterEventHandler = (clusteredEntities, cluster) => {
          cluster.billboard.show = true;
          cluster.billboard.verticalOrigin = Cesium.VerticalOrigin.BOTTOM;
          cluster.label.horizontalOrigin = Cesium.HorizontalOrigin.CENTER;
          cluster.label.verticalOrigin = Cesium.VerticalOrigin.BOTTOM;
          cluster.label.font = `bold 12px sans-serif`;
          cluster.label.fillColor = Cesium.Color.BLACK;
          cluster.label.disableDepthTestDistance = Number.POSITIVE_INFINITY;
          cluster.billboard.id = cluster.label.id;
          const allCount = clusterDS.entities.values.length || 0;
          const gradient = {
            0.0001: Cesium.Color.DEEPSKYBLUE,
            0.001: Cesium.Color.GREEN,
            0.01: Cesium.Color.ORANGE,
            0.1: Cesium.Color.RED,
          };
          for (const key in gradient) {
            if (clusteredEntities.length >= allCount * key) {
              const numLength = String(clusteredEntities.length).length;
              cluster.billboard.image = _drawCircle(gradient[key], numLength);
              cluster.label.show = true;
              if (numLength === 1) {
                cluster.label.pixelOffset = new Cesium.Cartesian2(0, -15);
              } else {
                const count = (numLength - 1) * 5 + numLength + 2;
                cluster.label.pixelOffset = new Cesium.Cartesian2(
                  0,
                  -15 - count
                );
              }
            }
          }
        };
        clusterDS.clustering.clusterEvent.addEventListener(
          _clusterEventHandler
        );
        setInterval(() => {
          let i = 0;
          while (i < 10) {
            i++;
            addBillboard();
          }
        }, 1000);

如上代码在iclient3d for cesium中存在两个问题

1.聚合点外出现label

2.最底层聚合点应该打开，未打开

同样代码在原生Cesium效果没问题

Answer 1

您好，关于聚合问题。lable聚合失效问题属于原生Cesium问题使用提供demo再原生中使用依然会出现lable聚合失效的问题。

可以参考下面文档重新定义画布聚合样式中的lable，以确保lable在广告牌中。

https://mcaitaco.blog.csdn.net/article/details/127663199