diff --git a/inc/hgl/graph/VKMemory.h b/inc/hgl/graph/VKMemory.h
index 6013c68c..4d5c5759 100644
--- a/inc/hgl/graph/VKMemory.h
+++ b/inc/hgl/graph/VKMemory.h
@@ -11,18 +11,13 @@ class GPUMemory
     uint32_t                index;
     uint32_t                properties;
 
+    VkMappedMemoryRange     memory_range;
+
 private:
 
     friend class GPUDevice;
 
-    GPUMemory(VkDevice dev,VkDeviceMemory dm,const VkMemoryRequirements &mr,const uint32 i,const uint32_t p)
-    {
-        device=dev;
-        memory=dm;
-        req=mr;
-        index=i;
-        properties=p;
-    }
+    GPUMemory(VkDevice dev,VkDeviceMemory dm,const VkMemoryRequirements &mr,const uint32 i,const uint32_t p);
 
 public:
 
@@ -48,6 +43,9 @@ public:
 
     bool    BindBuffer  (VkBuffer buffer);
     bool    BindImage   (VkImage image);
+
+    void    Flush       (VkDeviceSize,VkDeviceSize);
+    void    Flush       (VkDeviceSize size){Flush(0,size);}
 };//class GPUMemory
 VK_NAMESPACE_END
 #endif//HGL_GRAPH_VULKAN_MEMORY_INCLUDE
diff --git a/src/SceneGraph/Vulkan/VKMemory.cpp b/src/SceneGraph/Vulkan/VKMemory.cpp
index f8ecc695..b7420d6a 100644
--- a/src/SceneGraph/Vulkan/VKMemory.cpp
+++ b/src/SceneGraph/Vulkan/VKMemory.cpp
@@ -24,6 +24,19 @@ GPUMemory *GPUDevice::CreateMemory(const VkMemoryRequirements &req,uint32_t prop
     return(new GPUMemory(attr->device,memory,req,index,properties));
 }
 
+GPUMemory::GPUMemory(VkDevice dev,VkDeviceMemory dm,const VkMemoryRequirements &mr,const uint32 i,const uint32_t p)
+{
+    device=dev;
+    memory=dm;
+    req=mr;
+    index=i;
+    properties=p;
+
+    memory_range.sType  =VK_STRUCTURE_TYPE_MAPPED_MEMORY_RANGE;
+    memory_range.pNext  =nullptr;
+    memory_range.memory =memory;
+}
+
 GPUMemory::~GPUMemory()
 {
     vkFreeMemory(device,memory,nullptr);
@@ -57,6 +70,14 @@ void GPUMemory::Unmap()
     vkUnmapMemory(device,memory);
 }
 
+void GPUMemory::Flush(VkDeviceSize offset,VkDeviceSize size)
+{
+    memory_range.offset =offset;
+    memory_range.size   =size;
+
+    vkFlushMappedMemoryRanges(device,1,&memory_range);
+}
+
 bool GPUMemory::Write(const void *ptr,VkDeviceSize start,VkDeviceSize size)
 {
     if(!ptr)return(false);