diff --git a/examples/print.php b/examples/print.php
index 61d5100..9759d7d 100644
--- a/examples/print.php
+++ b/examples/print.php
@@ -4,14 +4,16 @@ namespace Blobt\Luxcore\scene;
 
 include dirname(dirname(__FILE__)) . "/vendor/autoload.php";
 
-$temp = new Native();
-
-//$temp->usePidir();
-
-echo $temp;
-
+$renderDevices = new RenderDevices();
+$trackerEngine = new TrackerEngine();
 
+$renderEngine = new RenderEngine;
+echo $renderEngine;
 
+$openCL = new OpenCL;
+echo $openCL;
 
+$native = new Native;
+echo $native;
 
 ?>
diff --git a/src/scene/OpenCL.php b/src/scene/OpenCL.php
index f030d4f..6b74226 100644
--- a/src/scene/OpenCL.php
+++ b/src/scene/OpenCL.php
@@ -2,8 +2,6 @@
 
 namespace Blobt\Luxcore\scene;
 
-use ParentIterator;
-
 class OpenCL extends BaseCfg
 {
 
@@ -20,7 +18,7 @@ class OpenCL extends BaseCfg
     /**
      * @var string 在GPU渲染模式下，使用哪些GPU设备
      */
-    public $devicesSelect = '10';
+    private $devicesSelect = '10';
     
     /**
      * @var integer 在GPU渲染模式下，CPU是否渲染，并以多少线程渲染
@@ -30,14 +28,16 @@ class OpenCL extends BaseCfg
 
 
     /**
-     * 以 RenderDevices类 的两个静态属性初始化变量 “$cpuUse”和“$gpuUse”
+     * 以 RenderDevices类 的两个静态属性初始化变量 “$cpuUse”和“$gpuUse”参数
      */
     public function __construct()
     {
-        self::$cpuUse =  RenderDevices::$cpuSwitch;
-        self::$gpuUse =  RenderDevices::$gpuSwitch;
+        self::refreshConfig();
     }
 
+    /**
+     * 从 RenderDevices类 的两个静态属性刷新变量 “$cpuUse”和“$gpuUse”参数
+     */
     public static function refreshConfig()
     {
         self::$cpuUse =  RenderDevices::$cpuSwitch;
diff --git a/src/scene/RenderEngine.php b/src/scene/RenderEngine.php
new file mode 100644
index 0000000..cddf724
--- /dev/null
+++ b/src/scene/RenderEngine.php
@@ -0,0 +1,52 @@
+<?php
+
+namespace Blobt\Luxcore\scene;
+
+class RenderEngine extends BaseCfg
+{
+        
+    //打开或关闭
+    const OPEN = 1;
+    const CLOSE = 0;
+
+    /**
+     * @var string 使用何种渲染引擎
+     */
+    private static $type = 'PATHOCL';
+
+    public function __construct()
+    {
+        self::refreshConfig();
+    }
+
+    /**
+     * 更新字符串变量“$type”
+     */
+    public static function refreshConfig()
+    {
+        
+        if( TrackerEngine::$Engine == 'PATH')
+        {
+            self::$type = TrackerEngine::$Engine;
+            if( RenderDevices::$cpuSwitch == self::OPEN )
+            {
+                self::$type = self::$type.'CPU';
+            }
+            else if ( RenderDevices::$gpuSwitch == self::OPEN )
+            {
+                self::$type = self::$type.'CPU';
+            }
+            else;            
+        }
+        else if( TrackerEngine::$Engine == 'BIDIR')
+        {
+            self::$type = TrackerEngine::$Engine;
+            if( RenderDevices::$cpuSwitch == self::OPEN )
+            {
+                self::$type = self::$type.'CPU';
+            }
+        }
+        
+    }
+
+}