diff --git a/examples/print.php b/examples/print.php
index d1676ff..9725ccd 100644
--- a/examples/print.php
+++ b/examples/print.php
@@ -119,6 +119,17 @@ $scene->registerObjects($obj);       //将模型添加到场景中
 
 
 //添加第二个模型
+$obj = new objects\Objects( [ 'ply' => 'mesh-119.ply','appliedtransformation' => '1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1' ] );     //创建一个的模型，
+$scene->registerObjects($obj);   //将模型添加到场景中
+
+
+$obj = new objects\Objects( [ 'ply' => 'mesh-119.ply','appliedtransformation' => '1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1' ] );     //创建一个的模型，
+$scene->registerObjects($obj);   //将模型添加到场景中
+
+
+
+
+
 $obj = new objects\Objects( [ 'ply' => 'mesh-119.ply','appliedtransformation' => '1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1' ] );     //创建一个的模型，
 
 $ClearVol = new volumes\Clear();    //创建一个 Clear体积效果
@@ -132,8 +143,6 @@ $obj->setMaterial($colorGlass);     //将玻璃材质赋值到模型的材质属
 $scene->registerObjects($obj);   //将模型添加到场景中
 
 
-
-
 echo $scene;
 
 
diff --git a/src/scene/Scene.php b/src/scene/Scene.php
index 5496ec7..cc9315f 100644
--- a/src/scene/Scene.php
+++ b/src/scene/Scene.php
@@ -50,6 +50,14 @@ class Scene extends BaseCfg
         $temp = null;
         $temp = sprintf("%014d",$obj->id);
         $obj->cards = $temp;
+        if($obj->material == null)
+        {
+            if( !array_key_exists('__default',$this->materials ) )
+            {   
+                $this->materials['__default'] = new materials\Matte();
+            }
+            $obj->material = '__default';            
+        }
         $this->objects[$temp] = $obj;
     }