对于扫描线效果 我们先定义一下他的interface, 方便使用的人知道他的调用参数
export interface PMaterialScan{
color?: any,
speed?: number,
}
对于扫描线我们叫 MaterialScan
import {MaterialProperty} from "./MaterialProperty";
const defaultOption: PMaterialScan = {
color: new Cesium.Color(1.0, 0.0, 0.0, 0.7),
speed: 10,
}
//扫描
export class MaterialScan extends MaterialProperty{
protected _getType(option: any): string {
return "MaterialScan"
}
constructor(option=defaultOption) {
super(MaterialScan.prototype, defaultOption, option);
}
protected getSource(option: any): string {
return `
uniform vec4 color;
uniform float speed;
czm_material czm_getMaterial(czm_materialInput materialInput){
czm_material material = czm_getDefaultMaterial(materialInput);
vec2 st = materialInput.st;
float time = fract(czm_frameNumber * speed / 1000.0);
material.diffuse = color.rgb;
material.alpha = color.a * fract(st.s-time);
更多参考 https://xiaozhuanlan.com/topic/3270685194
