diff --git a/inc/hgl/graph/VKRenderPass.h b/inc/hgl/graph/VKRenderPass.h
index 5c1a3266..cef82ac8 100644
--- a/inc/hgl/graph/VKRenderPass.h
+++ b/inc/hgl/graph/VKRenderPass.h
@@ -19,6 +19,8 @@ class RenderPass
     List<VkFormat> color_formats;
     VkFormat depth_format;
 
+    VkExtent2D granularity;
+
 protected:
 
     ObjectList<Pipeline> pipeline_list;
@@ -27,14 +29,7 @@ private:
 
     friend class DeviceRenderPassManage;
 
-    RenderPass(VkDevice d,VkPipelineCache pc,VkRenderPass rp,const List<VkFormat> &cf,VkFormat df)
-    {
-        device=d;
-        pipeline_cache=pc;
-        render_pass=rp;
-        color_formats=cf;
-        depth_format=df;
-    }
+    RenderPass(VkDevice d,VkPipelineCache pc,VkRenderPass rp,const List<VkFormat> &cf,VkFormat df);
 
 public:
 
@@ -53,6 +48,8 @@ public:
     }
     const VkFormat          GetDepthFormat()const{return depth_format;}
 
+    const VkExtent2D &      GetGranularity()const{return granularity;}
+
 public:
 
     Pipeline *CreatePipeline(const Material *,      PipelineData *);
diff --git a/src/SceneGraph/Vulkan/VKRenderPass.cpp b/src/SceneGraph/Vulkan/VKRenderPass.cpp
index ed00d907..1402db0d 100644
--- a/src/SceneGraph/Vulkan/VKRenderPass.cpp
+++ b/src/SceneGraph/Vulkan/VKRenderPass.cpp
@@ -5,6 +5,17 @@
 #include<hgl/graph/VKMaterial.h>
 #include<hgl/graph/VKMaterialInstance.h>
 VK_NAMESPACE_BEGIN
+RenderPass::RenderPass(VkDevice d,VkPipelineCache pc,VkRenderPass rp,const List<VkFormat> &cf,VkFormat df)
+{
+    device=d;
+    pipeline_cache=pc;
+    render_pass=rp;
+    color_formats=cf;
+    depth_format=df;
+
+    vkGetRenderAreaGranularity(device,render_pass,&granularity);
+}
+
 RenderPass::~RenderPass()
 {
     pipeline_list.Clear();