Cesium位置拾取

viewer.scene.globe.pick(ray, viewer.scene)

与viewer.scene.pickPosition(movement.position)

的关系如下：

代码如下：

// 添加摄像机拾取位置射线
    createPickRay(windowPosition) {
      let ray = viewer.camera.getPickRay(windowPosition);
      var positionWC = viewer.scene.globe.pick(ray, viewer.scene); 
      var positionCamera = viewer.camera.positionWC; //摄像机位置
      var direction = new Cesium.Cartesian3();
      direction = Cesium.Cartesian3.subtract(
        positionWC,
        positionCamera,
        direction
      ); 
      this.createPolyLine([positionCamera, positionWC]);
      this.createPointLabel(
        viewer,
        positionCamera,
        "刚才摄像机在这里",
        Cesium.Color.YELLOW
      );
    },
    // 创建并添加折线到球儿上
    createPolyLine(positions) {
      viewer.entities.add({
        name: "drawpolyline",
        polyline: {
          positions: positions,
          material: Cesium.Color.YELLOW,
          arcType: Cesium.ArcType.NONE
        }
      });
    },
    // 创建并添加点到球上
    createPointLabel(viewer, position, text, color) {
      var oLabelEntity = {
        name: "drawpolyline",
        position: position,
        clampToGround: true,
        attachPolygon: true,
        label: {
          text: text,
          font: "20px sans-serif",
          fillColor: color || Cesium.Color.GOLD,
          style: Cesium.LabelStyle.FILL_AND_OUTLINE,
          outlineWidth: 2,
          verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
          pixelOffset: new Cesium.Cartesian2(20, -20)
        },
        point: {
          color: color || new Cesium.Color(1.0, 0.0, 0.0, 0.8),
          pixelSize:15,
          perPositionHeight: false,
          disableDepthTestDistance: 1000000000
        }
      };
      return viewer.entities.add(oLabelEntity);
    }