diff --git a/example/Vulkan/two_triangle.cpp b/example/Vulkan/two_triangle.cpp
index 8e84e2a7..cbe2858f 100644
--- a/example/Vulkan/two_triangle.cpp
+++ b/example/Vulkan/two_triangle.cpp
@@ -86,16 +86,13 @@ private:
         
         render_instance=db->CreateRenderableInstance(render_obj,material_instance,pipeline);
 
-        {
-            SceneNode *sn=render_root.CreateSubNode(scale(0.5,0.5));
-            sn->RIList.Add(render_instance);
-        }
+        render_root.CreateSubNode(scale(0.5,0.5),render_instance);
 
         render_root.RefreshMatrix();
 
         SceneTreeToRenderList st2rl(device);
 
-        st2rl.Expend(&render_list,&render_root,&cam);
+        st2rl.Expend(&render_list,cam.info,&render_root);
 
         return(true);
     }
diff --git a/inc/hgl/graph/VKMaterial.h b/inc/hgl/graph/VKMaterial.h
index af2798a1..c6d408b9 100644
--- a/inc/hgl/graph/VKMaterial.h
+++ b/inc/hgl/graph/VKMaterial.h
@@ -23,6 +23,9 @@ class Material
 
     DescriptorSetLayoutCreater *dsl_creater;
 
+    DescriptorSets *g_desc_sets;
+    DescriptorSets *ri_desc_sets;
+
     VertexAttributeBinding *vab;
 
 public:
@@ -60,7 +63,10 @@ public:
     const   VkPipelineShaderStageCreateInfo *   GetStages               ()const{return shader_stage_list->GetData();}
 
     const   VkPipelineLayout                    GetPipelineLayout       ()const;
-            DescriptorSets *                    CreateDescriptorSets    ()const;
+            DescriptorSets *                    CreateMIDescriptorSets  ()const;
+
+            DescriptorSets *                    GetGlobalDescriptorSets (){return g_desc_sets;}
+            DescriptorSets *                    GetRIDescriptorSets     (){return ri_desc_sets;}
     
     const   VertexAttributeBinding *            GetVAB                  ()const{return vab;}
     const   uint32_t                            GetVertexAttrCount      ()const{return vab->GetVertexAttrCount();}    
diff --git a/src/SceneGraph/SceneTreeToRenderList.cpp b/src/SceneGraph/SceneTreeToRenderList.cpp
index adaac1bf..29bbf424 100644
--- a/src/SceneGraph/SceneTreeToRenderList.cpp
+++ b/src/SceneGraph/SceneTreeToRenderList.cpp
@@ -166,7 +166,7 @@ namespace hgl
         bool SceneTreeToRenderList::Expend(RenderList *rl,const CameraInfo &ci,SceneNode *sn)
         {
             if(!device)return(false);
-            if(!rl||sn)return(false);
+            if(!rl||!sn)return(false);
 
             camera_info=ci;
 
diff --git a/src/SceneGraph/Vulkan/VKMaterial.cpp b/src/SceneGraph/Vulkan/VKMaterial.cpp
index a8521764..a28681fa 100644
--- a/src/SceneGraph/Vulkan/VKMaterial.cpp
+++ b/src/SceneGraph/Vulkan/VKMaterial.cpp
@@ -104,10 +104,13 @@ Material::Material(const UTF8String &name,ShaderModuleMap *smm,List<VkPipelineSh
         vertex_sm=nullptr;
         vab=nullptr;
     }
+
+    ri_desc_sets=dsl_creater->Create(DescriptorSetsType::RenderableInstance);
 }
 
 Material::~Material()
 {
+    SAFE_CLEAR(ri_desc_sets);
     delete dsl_creater;
 
     if(vab)
@@ -150,8 +153,8 @@ const VkPipelineLayout Material::GetPipelineLayout()const
     return dsl_creater->GetPipelineLayout();
 }
 
-DescriptorSets *Material::CreateDescriptorSets()const
+DescriptorSets *Material::CreateMIDescriptorSets()const
 {
-    return dsl_creater->Create();
+    return dsl_creater->Create(DescriptorSetsType::MaterialInstance);
 }
 VK_NAMESPACE_END
diff --git a/src/SceneGraph/Vulkan/VKMaterialInstance.cpp b/src/SceneGraph/Vulkan/VKMaterialInstance.cpp
index 0fc6522f..05f7f2bc 100644
--- a/src/SceneGraph/Vulkan/VKMaterialInstance.cpp
+++ b/src/SceneGraph/Vulkan/VKMaterialInstance.cpp
@@ -70,7 +70,7 @@ void MaterialInstance::Update()
 
 MaterialInstance *Material::CreateInstance()
 {
-    DescriptorSets *ds=CreateDescriptorSets();
+    DescriptorSets *ds=CreateMIDescriptorSets();
 
     if(!ds)return(nullptr);