20.cesium求两个三维点的距离

方法1：笛卡尔坐标系

var d = Cesium.Cartesian3.distance(
new Cesium.Cartesian3(pick1.x, pick1.y, pick1.z),
new Cesium.Cartesian3(pick3.x, pick3.y, pick3.z)
); //pick1、pick3都是三维坐标系
或者
var d=Cesium.Cartesian3.distance(Cartesian3x1,Cartesian3x2);//x1,x2都是笛卡尔坐标系:

方法2：经纬度坐标（弧度）

//positions 包含两个点的数组
disTance = function (positions) {
var distance = 0;
for (var i = 0; i < positions.length - 1; i++) {
var point1cartographic = Cesium.Cartographic.fromCartesian(positions[i]);
var point2cartographic = Cesium.Cartographic.fromCartesian(
positions[i + 1]
);
/根据经纬度计算出距离/
var geodesic = new Cesium.EllipsoidGeodesic();
geodesic.setEndPoints(point1cartographic, point2cartographic);
var s = geodesic.surfaceDistance;
//返回两点之间的距离
// s = Math.sqrt(Math.pow(s, 2) + Math.pow(point2cartographic.height - point1cartographic.height, 2));
s = Math.abs(point2cartographic.height - point1cartographic.height);
distance = distance + s;
}
return distance.toFixed(3);
};