GisEyePureColorLightMaterialProperty

Example:

let lon = 104;
  let lat = 30;
  viewer.entities.add({
    polygon: {
      hierarchy: Cesium.Cartesian3.fromDegreesArrayHeights([
        lon - 0.2+1.5, lat - 0.1, 0,
        lon + 0.2+1.5, lat - 0.1, 0,
        lon + 0.2+1.5, lat - 0.5, 0,
        lon - 0.2+1.5, lat - 0.5, 0,
      ]),
      material: new GisEye.GisEyePureColorLightMaterialProperty({
        bgColor: new Cesium.Color(1.0, 1.0, 0.0, 1.0),
        lightColor: new Cesium.Color(1.0, 1.0, 0.0, 1.0),
        alpha:0.2,
        isTranslucent:true
      })
    }
  });