save full SceneNode in RenderNode,added length sort.

inc/hgl/graph/MaterialRenderList.h

@@ -7,6 +7,7 @@
 VK_NAMESPACE_BEGIN
 class RenderAssignBuffer;
 class SceneNode;
+struct CameraInfo;
 
 /**
 * 同一材质的对象渲染列表
@@ -18,6 +19,8 @@ class MaterialRenderList
 
     Material *material;
 
+    CameraInfo *camera_info;
+
     RenderNodeList rn_list;
 
 private:
@@ -76,6 +79,11 @@ public:
 
     void Add(SceneNode *);
 
+    void SetCameraInfo(CameraInfo *ci)
+    {
+        camera_info=ci;
+    }
+
     void Clear()
     {
         rn_list.Clear();