用于城市的点样式

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// feature layer representing points of interest as icons
const pointsLayer = new FeatureLayer({
  ...
  elevationInfo: {
    // this elevation mode will place points on top of
    // buildings or other SceneLayer 3D objects
    mode: "relative-to-scene"
  },
  ...
});

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// symbol representing a point of interest
const symbol = {
  type: "point-3d", // autocasts as new PointSymbol3D()
  symbolLayers: [
    {
      type: "icon" // autocasts as new IconSymbol3DLayer()
      // add properties for the IconSymbol3DLayer here
    }
  ],

  verticalOffset: {
    screenLength: 40,
    maxWorldLength: 200,
    minWorldLength: 35
  },

  callout: {
    type: "line", // autocasts as new LineCallout3D()
    color: "white",
    size: 2,
    border: {
      color: [50, 50, 50]
    }
  }
};

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const pointsLayer = new FeatureLayer({
  ...
  // we recommend turning this feature off when
  // working with size visual variables
  screenSizePerspectiveEnabled: false,
  ...
});

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// feature layer representing points of interest
const pointsLayer = new FeatureLayer({
  ...
  featureReduction: {
    type: "selection"
  },
  ...
});