diff --git a/CMCore b/CMCore
index 5e081538..8f184a87 160000
--- a/CMCore
+++ b/CMCore
@@ -1 +1 @@
-Subproject commit 5e08153800ef4b0f46b9cad44b1e7e05415befef
+Subproject commit 8f184a87fbd630da45b6708ee0fcfcb8372fdef1
diff --git a/inc/hgl/graph/VK.h b/inc/hgl/graph/VK.h
index e256e831..7d95d310 100644
--- a/inc/hgl/graph/VK.h
+++ b/inc/hgl/graph/VK.h
@@ -73,6 +73,8 @@ public:
 
 using VABAccessMap=Map<AnsiString,VABAccess>;
 
+class VABView;
+
 class IndexBuffer;
 
 struct IndexBufferAccess
diff --git a/inc/hgl/graph/VKVertexAttribBuffer.h b/inc/hgl/graph/VKVertexAttribBuffer.h
index 2958e8f3..25d28c47 100644
--- a/inc/hgl/graph/VKVertexAttribBuffer.h
+++ b/inc/hgl/graph/VKVertexAttribBuffer.h
@@ -36,6 +36,21 @@ namespace hgl
         };//class VertexAttribBuffer:public DeviceBuffer
 
         using VAB=VertexAttribBuffer;
+
+        class VABView
+        {
+        public:
+
+            VABView()=default;
+            virtual ~VABView()=default;
+
+            virtual VAB *GetVAB()=0;
+            virtual VkDeviceSize GetStart()const=0;
+            virtual VkDeviceSize GetSize()const=0;
+
+            virtual void *Map()=0;
+            virtual void Unmap()=0;
+        };//class VABView
     }//namespace graph
 }//namespace hgl
 #endif//HGL_GRAPH_VULKAN_VERTEX_ATTRIB_BUFFER_INCLUDE
diff --git a/inc/hgl/graph/VertexDataManager.h b/inc/hgl/graph/VertexDataManager.h
index 8e28809e..db773529 100644
--- a/inc/hgl/graph/VertexDataManager.h
+++ b/inc/hgl/graph/VertexDataManager.h
@@ -3,11 +3,45 @@
 #include<hgl/graph/VK.h>
 #include<hgl/graph/VKIndexBuffer.h>
 #include<hgl/type/DataChain.h>
+#include<hgl/type/Pair.h>
 
 namespace hgl
 {
     namespace graph
     {
+        class VertexDataManager;
+
+        struct IBAccessNode:public IBAccess
+        {
+        private:
+
+            VertexDataManager *vdm;
+            DataChain::UserNode *dc_node;
+
+        public:
+
+            friend class VertexDataManager;
+
+            ~IBAccessNode();
+        };
+
+        struct VABAccessNode
+        {
+        private:
+
+            VertexDataManager *vdm;
+            DataChain::UserNode *dc_node;
+            const VIL *vil;
+
+            VABAccess **vab;
+
+        public:
+
+            friend class VertexDataManager;
+
+            ~VABAccessNode();
+        };
+
         class VertexDataManager
         {
             GPUDevice *device;
@@ -30,6 +64,14 @@ namespace hgl
             DataChain       vbo_data_chain; ///<数据链
             DataChain       ibo_data_chain; ///<数据链
 
+        protected:
+
+            friend struct IBAccessNode;
+            friend struct VABAccessNode;
+
+            bool ReleaseIB(DataChain::UserNode *);
+            bool ReleaseVAB(DataChain::UserNode *);
+
         public:
 
             VertexDataManager(GPUDevice *dev,const VIL *_vil);
@@ -49,6 +91,10 @@ namespace hgl
         public:
 
             bool Init(const VkDeviceSize vbo_size,const VkDeviceSize ibo_size,const IndexType index_type);
+
+            IBAccessNode *AcquireIB(const VkDeviceSize count);
+
+            VABAccessNode *AcquireVAB(const VkDeviceSize count);
         };//class VertexDataManager
     }//namespace graph
 }//namespace hgl
diff --git a/src/SceneGraph/VertexDataManager.cpp b/src/SceneGraph/VertexDataManager.cpp
index b736c767..175ac1c0 100644
--- a/src/SceneGraph/VertexDataManager.cpp
+++ b/src/SceneGraph/VertexDataManager.cpp
@@ -6,6 +6,19 @@
 
 namespace hgl
 {
+    namespace graph
+    {
+        IBAccessNode::~IBAccessNode()
+        {
+            vdm->ReleaseIB(dc_node);
+        }
+
+        VABAccessNode::~VABAccessNode()
+        {
+            vdm->ReleaseVAB(dc_node);
+        }
+    }//namespace graph
+
     namespace graph
     {
         VertexDataManager::VertexDataManager(GPUDevice *dev,const VIL *_vil)
@@ -70,5 +83,76 @@ namespace hgl
 
             return(true);
         }
+
+        IBAccessNode *VertexDataManager::AcquireIB(const VkDeviceSize count)
+        {
+            if(count<=0)return(false);
+
+            DataChain::UserNode *un=ibo_data_chain.Acquire(count);
+
+            if(!un)return(false);
+
+            IBAccessNode *node=new IBAccessNode;
+
+            node->vdm=this;
+            node->dc_node=un;
+
+            node->buffer=ibo;
+            node->start=un->GetStart();
+            node->count=un->GetCount();
+
+            ibo_cur_size+=count;
+
+            return(node);
+        }
+        
+        bool VertexDataManager::ReleaseIB(DataChain::UserNode *un)
+        {
+            if(!un)return(false);
+
+            const auto count=un->GetCount();
+
+            if(!ibo_data_chain.Release(un))
+                return(false);
+
+            ibo_cur_size-=count;
+            return(true);
+        }
+
+        VABAccessNode *VertexDataManager::AcquireVAB(const VkDeviceSize count)
+        {
+            if(count<=0)return(false);
+
+            DataChain::UserNode *un=vbo_data_chain.Acquire(count);
+
+            if(!un)return(false);
+
+            VABAccessNode *node=new VABAccessNode;
+
+            node->vdm=this;
+            node->dc_node=un;
+            node->vil=vil;
+
+            //node->buffer=vab[0];
+            //node->start=un->GetStart();
+            //node->count=un->GetCount();
+
+            vab_cur_size+=count;
+
+            return(node);
+        }
+
+        bool VertexDataManager::ReleaseVAB(DataChain::UserNode *un)
+        {
+            if(!un)return(false);
+
+            const auto count=un->GetCount();
+
+            if(!vbo_data_chain.Release(un))
+                return(false);
+
+            vab_cur_size-=count;
+            return(true);
+        }
     }//namespace graph
 }//namespace hgl