cesium小车移动如何在停止后保持最后一帧的方向?

测试代码：使用参数static constant Cesium.ExtrapolationType.HOLD 当超出样本数据范围时，将使用第一个或最后一个值。 但实际上一直是保持第一个值，或者说是向东的方向 ，没法保持最后一帧的方向 。如下代码 测试后会在停止时调车头向正东。 需求是停止时，车保持最后一帧的方向 。 麻烦各位帮看看！ 多谢！ let czml = [{

                    "id": "document",
                    "version": "1.0",
                    "clock": {
                        "currentTime": "2020-12-20T16:00:03Z",
                        "multiplier": 1
                    }
                }, {
                    "id": "line1",
                    "name": "XX路线1",
                    "availability": "2020-12-20T16:00:00Z/2020-12-20T16:05:00Z",
                    "model": {
                        "gltf": "../SampleData/models/GroundVehicle/GroundVehicle.glb",
                        "scale": 1
                    },
                    "orientation": {
                        "velocityReference": "#position"
                    },
                    "viewFrom": {
                        "cartesian": [80, 80, 80]
                    },
                    "path": {
                        "material": {
                            "solidColor": {
                                "color": {
                                    "interval": "2020-12-20T16:00:00Z/2020-12-20T16:05:00Z",
                                    "rgba": [255, 0, 0, 255]
                                }
                            }
                        },
                        "width": [{
                            "interval": "2020-12-20T16:00:00Z/2020-12-20T16:05:00Z",
                            "number": 0.0
                        }]
                    },
                    "position": {
                        "interpolationAlgorithm": "LAGRANGE",
                        "forwardExtrapolationType": 'HOLD',
                        "interpolationDegree": 1,
                        "epoch": "2020-12-20T16:00:00Z",
                        "cartographicDegrees": [
                            0.00,108.328947792453,22.7469164044214,0.0,
                            3.071,108.329388241433,22.7470366141948,0.0,
                            5.540,108.32928156764,22.7474785429229,0.0,
                            9.540,108.329014032717,22.7474785429229,0.0
                        ]
                    }
                }]
                var dataSourcePromise = new Cesium.CzmlDataSource.load(czml);
                // 位置属性
                viewer.dataSources.add(dataSourcePromise);
                viewer.zoomTo(dataSourcePromise);

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