自定义Material材质

const Circle3WaveType = "Circle3Wave" // 材质类型名
mars3d.MaterialUtil.register(Circle3WaveType, {
 fabric: {
   uniforms: {
     color1: Cesium.Color.RED,
     color2: Cesium.Color.YELLOW,
     color3: Cesium.Color.BLUE,
     alpha: 1.0,
     speed: 10.0,
     globalAlpha: 1.0
   },
   source: `czm_material czm_getMaterial(czm_materialInput materialInput)
   {
       czm_material material = czm_getDefaultMaterial(materialInput);
       vec2 st = materialInput.st;
       float dis = distance(st, vec2(0.5, 0.5));
       float per = fract(speed*czm_frameNumber/1000.0);
       float scale = per * 0.5;
       if(dis > scale){
         discard;
       }else {
         material.alpha = alpha * globalAlpha;
       }

       if(dis < scale/3.0)
         material.diffuse = color1.rgb;
       else  if(dis>scale/3.0 && dis<scale*2.0/3.0)
         material.diffuse =  color2.rgb;
       else
         material.diffuse = color3.rgb;

       return material;
   }`
 },
 translucent: true
})

如果材质是给Entity使用的，您还需要封装成属性材质对象

/**
 * 自定义属性材质，用于Entity对象
 */
class Circle3WaveMaterialProperty extends mars3d.material.BaseMaterialProperty {
  // 材质名称
  getType(time) {
    return Circle3WaveType
  }

  // 更新属性
  getValue(time, result={}) {
    result.color1 = this.options.color1 ?? Cesium.Color.RED
    result.color2 = this.options.color2 ?? Cesium.Color.YELLOW
    result.color3 = this.options.color3 ?? Cesium.Color.BLUE
    result.alpha = this.options.alpha ?? 1.0
    result.speed = this.options.speed ?? 10.0
    result.globalAlpha = this.options.globalAlpha ?? 1

    return result
  }
}
mars3d.MaterialUtil.registerPropertyClass(Circle3WaveType, Circle3WaveMaterialProperty)