优化文本材质更新

src/DatabaseServices/Text/Text.ts

@@ -101,7 +101,7 @@ export class Text extends Entity
         this.UpdateTranslate();
         this.AsyncUpdated();
     }
-    //TODO: FIXME 应该避免一直重载这个迭代.
+
     UpdateTranslate()
     {
         for (let [type, obj] of this._CacheDrawObject)
@@ -149,10 +149,14 @@ export class Text extends Entity
     {
         this.AsyncUpdateDrawObject(obj, type);
     }
-    UpdateDrawObjectMaterial(type: RenderType, en: Object3D)
+    UpdateDrawObjectMaterial(renderType: RenderType, en: Object3D)
     {
-        if (en)
-            this.AsyncUpdateDrawObject(en, type);
+        if (en && en.children.length === 1)
+        {
+            let mesh = en.children[0] as Mesh;
+            let color = renderType === RenderType.Print ? 256 : this.ColorIndex;
+            mesh.material = ColorMaterial.GetBasicMaterialDoubleSide(color);
+        }
     }
     GetGripPoints(): Array<Vector3>
     {