对于电弧效果 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 PMaterialElec{
color?:any,
speed?:number
}
对于电弧我们叫 MaterialElec
```javascript
import { MaterialProperty } from "./MaterialProperty";
const defaultOption: PMaterialElec = {
color: Cesium.Color.AQUA,
speed: 1,
}
//电弧效果
export class MaterialElec extends MaterialProperty {
protected _getType(option: any): string {
return "MaterialElec"
}
constructor(option=defaultOption){
super(MaterialElec.prototype,defaultOption,option);
}
protected getSource(option: any): string {
return `uniform vec4 color;
uniform float speed;
#define pi 3.1415926535
#define PI2RAD 0.01745329252
#define TWO_PI (2. * PI)
float rands(float p){
return fract(sin(p) * 10000.0);
}
float noise(vec2 p){
float time = fract( czm_frameNumber * speed / 1000.0);
float t = time / 20000.0;
if(t > 1.0) t -= floor(t);
return rands(p.x * 14. + p.y * sin(t) * 0.5);
}
vec2 sw(vec2 p){
return vec2(floor(p.x), floor(p.y));
}
vec2 se(vec2 p){
return vec2(ceil(p.x), floor(p.y));
}
vec2 nw(vec2 p){
return vec2(floor(p.x), ceil(p.y));
}
vec2 ne(vec2 p){
return vec2(ceil(p.x), ceil(p.y));
}
float smoothNoise(vec2 p){
vec2 inter = smoothstep(0.0, 1.0, fract(p));
float s = mix(noise(sw(p)), noise(se(p)), inter.x);
float n = mix(noise(nw(p)), noise(ne(p)), inter.x);
return mix(s, n, inter.y);
}
更多参考 https://xiaozhuanlan.com/topic/1809347256
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