Cesium.PolylineGeometry 不起作用。 Cesium.SimplePolylineGeometry 确实

Question

我是这样创建Cesium.Primitive的：

    _createPrimitive: function (linesNumber) {
        var instances = [];
        for (var i = 0; i < linesNumber; i++) {
            var lon = _.random(-90, 90);
            var lat = _.random(-180, 180);
            var polyline = new Cesium.SimplePolylineGeometry({
                positions: Cesium.Cartesian3.fromDegreesArrayHeights([
                    lat, lon, 0,
                    lat, lon, 2000000])
            });
            var geometry = Cesium.SimplePolylineGeometry.createGeometry(polyline);
            instances.push(new Cesium.GeometryInstance({
                geometry: geometry,
                attributes: {
                    color: Cesium.ColorGeometryInstanceAttribute.fromColor(Cesium.Color.fromRandom({alpha: 1}))
                }
            }));
        }
        return new Cesium.Primitive({
            geometryInstances: instances,
            appearance: new Cesium.PerInstanceColorAppearance()
        });
    },

稍后将其添加到场景中：

scene.primitives.add(this._createPrimitive(20000));

它按预期工作。我想改变折线的宽度。我将 Cesium.SimplePolylineGeometry 更改为 Cesium.PolylineGeometry 并将 width 参数添加到 Cesium.PolylineGeometry 构造函数调用：

    _createPrimitive: function (linesNumber) {
        var instances = [];
        for (var i = 0; i < linesNumber; i++) {
            var lon = _.random(-90, 90);
            var lat = _.random(-180, 180);
            var polyline = new Cesium.PolylineGeometry({
                positions: Cesium.Cartesian3.fromDegreesArrayHeights([
                    lat, lon, 0,
                    lat, lon, 2000000]),
                width: 4
            });
            var geometry = Cesium.PolylineGeometry.createGeometry(polyline);
            instances.push(new Cesium.GeometryInstance({
                geometry: geometry,
                attributes: {
                    color: Cesium.ColorGeometryInstanceAttribute.fromColor(Cesium.Color.fromRandom({alpha: 1}))
                }
            }));
        }
        return new Cesium.Primitive({
            geometryInstances: instances,
            appearance: new Cesium.PerInstanceColorAppearance()
        });
    },

地球是空的！我做错了什么？

Answer 1

问题是我使用不当appearance：例如Cesium.PolylineColorAppearance工作正常：

    return new Cesium.Primitive({
        geometryInstances: instances,
        appearance: new Cesium.PolylineColorAppearance()
    });

Cesium.PolylineGeometry 不起作用。 Cesium.SimplePolylineGeometry 确实

Cesium.PolylineGeometry doesn't work. Cesium.SimplePolylineGeometry does

javascript

cesium