cesium 实现雷达波

构建雷达扫描

```

// TODO 未集成
export class RadarRadiationWave {
viewer:any;

• init(map: any){
• this.viewer = map;
• this.initRadarRiationWave1();
• this.initRadarRiationWave2();
• }
•  
• initRadarRiationWave1 () {
• var e = this.viewer.scene, i = Cesium.Cartesian3.fromDegrees(112.39, 39.9),
• a = Cesium.Cartesian3.fromDegrees(112.39, 39.9, 2e5),
• t = Cesium.Cartesian3.fromDegrees(112.39, 39.9, 4e5),
• r = Cesium.Matrix4.multiplyByTranslation(Cesium.Transforms.eastNorthUpToFixedFrame(i), new Cesium.Cartesian3(0, 0, 2e5), new Cesium.Matrix4);
• this.viewer.camera.flyToBoundingSphere(new Cesium.BoundingSphere(a, 4e5));
• e.primitives.add(new Cesium.BillboardCollection).add({
• image: "./images/svg/wave.svg",
• position: t,
• horizontalOrigin: Cesium.HorizontalOrigin.LEFT,
• verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
• pixelOffset: new Cesium.Cartesian2(-10, 10),
• scale: .3
• });
• var n = new Cesium.CylinderGeometry({
• length: 4e5,
• topRadius: 0,
• bottomRadius: 12e4,
• vertexFormat: Cesium.MaterialAppearance.MaterialSupport.TEXTURED.vertexFormat
• }), s = new Cesium.GeometryInstance({geometry: n, modelMatrix: r}),
• o = e.primitives.add(new Cesium.Primitive({
• geometryInstances: [s],
• appearance: new Cesium.MaterialAppearance({
• material: new Cesium.Material({
• fabric: {
• type: "VtxfShader1",
• uniforms: {
• color: new Cesium.Color(.2, 1, 0, 1),
• repeat: 30,
• offset: 0,
• thickness: .3
• },
• source: "\n uniform vec4 color;\n uniform float repeat;\n uniform float offset;\n uniform float thickness;\n czm_material czm_getMaterial(czm_materialInput materialInput)\n {\n czm_material material = czm_getDefaultMaterial(materialInput);\n float sp = 1.0/repeat;\n vec2 st = materialInput.st;\n float dis = distance(st, vec2(0.5));\n float m = mod(dis + offset, sp);\n float a = step(sp*(1.0-thickness), m);\n material.diffuse = color.rgb;\n material.alpha = a * color.a;\n return material;\n }\n "
• }, translucent: !1
• }), faceForward: !1, closed: !0
• })
• }));
• this.viewer.scene.preUpdate.addEventListener(function () {

 更多参考 https://xiaozhuanlan.com/topic/3748102965