diff --git a/src/SceneGraph/Vulkan/VKPrimitiveData.cpp b/src/SceneGraph/Vulkan/VKPrimitiveData.cpp
index 57ac1de7..6c822cb8 100644
--- a/src/SceneGraph/Vulkan/VKPrimitiveData.cpp
+++ b/src/SceneGraph/Vulkan/VKPrimitiveData.cpp
@@ -97,6 +97,8 @@ namespace
         GPUDevice *device;
 
     public:
+        
+        VertexDataManager *GetVDM(){return nullptr;}
 
         PrimitiveDataPrivateBuffer(GPUDevice *dev,const VIL *_vil,const VkDeviceSize vc):PrimitiveData(_vil,vc)
         {
@@ -197,6 +199,8 @@ namespace
 
     public:
 
+        VertexDataManager *GetVDM(){return vdm;}
+
         PrimitiveDataVDM(VertexDataManager *_vdm,const VkDeviceSize vc):PrimitiveData(_vdm->GetVIL(),vc)
         {
             vdm=_vdm;
diff --git a/src/SceneGraph/Vulkan/VKPrimitiveData.h b/src/SceneGraph/Vulkan/VKPrimitiveData.h
index 5af5e47e..83beb0fd 100644
--- a/src/SceneGraph/Vulkan/VKPrimitiveData.h
+++ b/src/SceneGraph/Vulkan/VKPrimitiveData.h
@@ -40,6 +40,10 @@ public:
             VABAccess *     GetVABAccess    (const AnsiString &name);
             IBAccess *      GetIBAccess     (){return &ib_access;}
 
+public:
+
+    virtual VertexDataManager *GetVDM()=0;
+
 public:
 
     virtual IBAccess * InitIBO(const VkDeviceSize index_count,IndexType it)=0;