Cesium的CallbackProperty动态更新positions时报错：TypeError: Cannot read properties of undefined (reading ‘height’)的问题

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问题：

最近使用Cesium的CallbackProperty动态更新polyline的positions时Cesium报错：TypeError: Cannot read properties of undefined (reading ‘height’)

核心代码：

const isConstant = false;
const redLine = viewer.entities.add({
  polyline: {
    // This callback updates positions each frame.
    positions: new Cesium.CallbackProperty(function (time, result) {
      endLongitude =
        startLongitude +
        0.001 * Cesium.JulianDate.secondsDifference(time, startTime);
      return [Cesium.Cartesian3.ZERO, Cesium.Cartesian3.ONE];
      return Cesium.Cartesian3.fromDegreesArray(
        [startLongitude, startLatitude, endLongitude, startLatitude],
        Cesium.Ellipsoid.WGS84,
        result
      );
    }, isConstant),
    width: 5,
    material: Cesium.Color.RED,
  },
});

报错原因：

此处的positions不支持（0，0，0）这样三个分量都为0的坐标，换成Cesium.Cartesian3.UNIT_X便能正常运行，详见官网沙盒。

发表于：Javascript/前端、技术分享、未分类

2023-02-07

# Cesium