Merge branch 'develop' of http://xny.yj-3d.com:3000/zh/sdk4.0 into develop

src/Global/efflect/Sunshine/index.js

@@ -61,6 +61,10 @@ export default class Sunshine {
   set darkness(v) {
     this.options.darkness = v
     this.viewer.shadowMap.darkness = 1.0 - this.options.darkness
+    this._elms.darkness &&
+      this._elms.darkness.forEach(item => {
+        item.value = v
+      })
   }
 
   get speed() {