positions:Cesium.Cartesian3.fromDegreesArray([
-120.0, 40.0, -110.0, 30.0
])
positions:Cesium.PolylinePipeline. generateCartesianArc({ //沿着地球表面画线
positions:Cesium.Cartesian3.fromDegreesArray([
-120.0, 40.0, -110.0, 30.0
])
})
generateCartesianRhumbArc 恒向线，两点之间与经线处处保持角度相等的曲线
positions: Cesium.PolylinePipeline.generateCartesianRhumbArc({
positions: Cesium.Cartesian3.fromDegreesArray([
-130.0, 30.0, -75.0, 30.0
])
}),
