项目地址

https://github.com/zhengjie9510/webgis-demo

实现效果

核心代码

var radar = scene.primitives.add(new Primitive({geometryInstances: redCone,appearance: new MaterialAppearance({// 自定义纹理material: new Material({fabric: {// type: "radar",uniforms: {color: new Color(0.2, 1.0, 0.0, 1.0),repeat: 30.0,offset: 0.0,thickness: 0.2,},source: `uniform vec4 color;uniform float repeat;uniform float offset;uniform float thickness;czm_material czm_getMaterial(czm_materialInput materialInput){czm_material material = czm_getDefaultMaterial(materialInput);float sp = 1.0/repeat;vec2 st = materialInput.st;float dis = distance(st, vec2(0.5));float m = mod(dis + offset, sp);float a = step(sp*(1.0-thickness), m);material.diffuse = color.rgb;material.alpha = a * color.a;vec3 normalMC = material.normal;if(normalMC.y < 0.0 && normalMC.z < 0.0){ discard;}return material;}`,},translucent: true,}),faceForward: false, // 当绘制的三角面片法向不能朝向视点时，自动翻转法向，从而避免法向计算后发黑等问题closed: true, // 是否为封闭体，实际上执行的是是否进行背面裁剪vertexShaderSource: `in vec3 position3DHigh;in vec3 position3DLow;in vec3 normal;in vec2 st;in float batchId;out vec3 v_positionEC;out vec3 v_normalEC;out vec2 v_st;void main(){vec4 p = czm_computePosition();v_positionEC = (czm_modelViewRelativeToEye * p).xyz;      // position in eye coordinatesv_normalEC =  normal;                         // normal in world coordinatesv_st = st;gl_Position = czm_modelViewProjectionRelativeToEye * p;}`,}),})
)