原文链接及内容

原文链接：https://sandcastle.cesium.com/?src=Polylines%20on%203D%20Tiles.html&label=All

效果如下图所示：

示例代码如下：

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const viewer = new Cesium.Viewer("cesiumContainer", {
  geocoder: false,
  homeButton: false,
  sceneModePicker: false,
  navigationHelpButton: false,
  navigationInstructionsInitiallyVisible: false,
  animation: false,
  timeline: false,
  fullscreenButton: false,
  skyBox: false,
  shouldAnimate: true,
  baseLayerPicker: false,
  shadows: true,
});
viewer.cesiumWidget.creditContainer.style.display = "none";

// 由 Bentley Systems 提供的发电厂设计模型
const scene = viewer.scene;

viewer.clock.currentTime = Cesium.JulianDate.fromIso8601(
  "2022-08-01T00:00:00Z"
);

scene.camera.setView({
  destination: new Cesium.Cartesian3(
    1234151.4883992162,
    -5086036.79436967,
    3633328.4278331124
  ),
  orientation: {
    heading: 5.593695742186853,
    pitch: -1.0786797635545216,
    roll: 6.27892466154778,
  },
});

// 加载发电厂模型
let powerPlant;
let powerPlantShow = true;
try {
  powerPlant = await Cesium.Cesium3DTileset.fromIonAssetId(2464651);
  powerPlant.show = powerPlantShow;
  scene.primitives.add(powerPlant);
  powerPlant.tileLoad.addEventListener(function (tile) {
    processTileFeatures(tile, hideDuplicateFloor);
  });
} catch (error) {
  console.log(`Error loading tileset: ${error}`);
}

// 隐藏重复的平面几何体，以避免渲染闪烁问题，即 z-fighting 伪影(artifacts)。
const duplicateFloor = 114082;
function getElement(feature) {
  return parseInt(feature.getProperty("element"), 10);
}

function hideDuplicateFloor(feature) {
  const element = parseInt(feature.getProperty("element"), 10);

  if (element === duplicateFloor) {
    feature.show = false;
  }
}

function processContentFeatures(content, callback) {
  const featuresLength = content.featuresLength;
  for (let i = 0; i < featuresLength; ++i) {
    const feature = content.getFeature(i);
    callback(feature);
  }
}

function processTileFeatures(tile, callback) {
  const content = tile.content;
  const innerContents = content.innerContents;
  if (Cesium.defined(innerContents)) {
    const length = innerContents.length;
    for (let i = 0; i < length; ++i) {
      processContentFeatures(innerContents[i], callback);
    }
  } else {
    processContentFeatures(content, callback);
  }
}

// 添加管道折线
const pipes = viewer.entities.add({
  polyline: {
    positions: Cesium.Cartesian3.fromDegreesArray([
      -76.36053390920833, 34.949935893493596, -76.36055481641581,
      34.94993589886988, -76.36055477047704, 34.94992280693651,
    ]),
    width: 6,
    material: new Cesium.PolylineDashMaterialProperty({
      color: Cesium.Color.YELLOW,
      dashLength: 20.0,
    }),
    show: true,
    clampToGround: true,
    classificationType: Cesium.ClassificationType.CESIUM_3D_TILE,
  },
});

// 加载摄影测量模型
let building;
try {
  building = await Cesium.Cesium3DTileset.fromIonAssetId(40866);
  building.show = !powerPlantShow;
  scene.primitives.add(building);
} catch (error) {
  console.log(`瓦片集加载出错: ${error}`);
}
// 添加路线折线
const route = viewer.entities.add({
  polyline: {
    positions: Cesium.Cartesian3.fromDegreesArray([
      -75.59604807301078, 40.03948512841901, -75.59644577413066,
      40.039316280505446, -75.59584544997564, 40.03846271524258,
      -75.59661425371488, 40.03814087821916, -75.59664726332451,
      40.03818297772907,
    ]),
    width: 6,
    material: new Cesium.PolylineDashMaterialProperty({
      color: Cesium.Color.YELLOW,
    }),
    show: false,
    clampToGround: true,
    classificationType: Cesium.ClassificationType.CESIUM_3D_TILE,
  },
});

Sandcastle.addDefaultToolbarMenu([
  {
    text: "BIM(发电厂模型)",
    onselect: function () {
      powerPlantShow = true;

      pipes.polyline.show = powerPlantShow;
      route.polyline.show = !powerPlantShow;
      if (Cesium.defined(powerPlant)) {
        powerPlant.show = powerPlantShow;
      }
      if (Cesium.defined(building)) {
        building.show = !powerPlantShow;
      }

      scene.camera.setView({
        destination: new Cesium.Cartesian3(
          1234151.4883992162,
          -5086036.79436967,
          3633328.4278331124
        ),
        orientation: {
          heading: 5.593695742186853,
          pitch: -1.0786797635545216,
          roll: 6.27892466154778,
        },
      });
    },
  },
  {
    text: "摄影测量模型",
    onselect: function () {
      powerPlantShow = false;

      pipes.polyline.show = powerPlantShow;
      route.polyline.show = !powerPlantShow;
      if (Cesium.defined(powerPlant)) {
        powerPlant.show = powerPlantShow;
      }
      if (Cesium.defined(building)) {
        building.show = !powerPlantShow;
      }

      scene.camera.setView({
        destination: new Cesium.Cartesian3(
          1216596.5376729995,
          -4736445.416889214,
          4081406.990364228
        ),
        orientation: {
          heading: 5.153176564030707,
          pitch: -0.9701972964526693,
          roll: 6.277883257569513,
        },
      });
    },
  },
]);