diff --git a/example/common/VulkanAppFramework.h b/example/common/VulkanAppFramework.h
index aaf8443d..a9136498 100644
--- a/example/common/VulkanAppFramework.h
+++ b/example/common/VulkanAppFramework.h
@@ -80,7 +80,7 @@ public:
 
     virtual bool Init(int w,int h)
     {
-        clear_color.Zero();
+        clear_color.Set(0,0,0,1);
 
     #ifdef _DEBUG
         if(!CheckStrideBytesByFormat())
@@ -211,7 +211,7 @@ public:
 
         cb->Begin();
             cb->BindFramebuffer(rp,fb);
-            cb->SetClearColor(0,clear_color.r,clear_color.g,clear_color.b);
+            cb->SetClearColor(0,clear_color);
             cb->BeginRenderPass();
                 cb->BindPipeline(ri->GetPipeline());
                 cb->BindDescriptorSets(ri);
@@ -268,7 +268,7 @@ public:
 
         cb->Begin();
         cb->BindFramebuffer(sc_render_target->GetRenderPass(),sc_render_target->GetFramebuffer(index));        
-        cb->SetClearColor(0,clear_color.r,clear_color.g,clear_color.b);
+        cb->SetClearColor(0,clear_color);
             cb->BeginRenderPass();
                 rl->Render(cb);
             cb->EndRenderPass();
diff --git a/inc/hgl/graph/VKCommandBuffer.h b/inc/hgl/graph/VKCommandBuffer.h
index eaa797d9..8356e2c0 100644
--- a/inc/hgl/graph/VKCommandBuffer.h
+++ b/inc/hgl/graph/VKCommandBuffer.h
@@ -60,16 +60,16 @@ public:
     void SetRenderArea(const VkExtent2D &);
     void SetViewport(const VkViewport &vp){viewport=vp;}
 
-    void SetClearColor(uint32_t index,float r,float g,float b,float a=1.0f)
+    void SetClearColor(uint32_t index,const Color4f &cc)
     {
         if(index>=cv_count)return;
 
         VkClearValue *cv=clear_values+index;
 
-        cv->color.float32[0]=r;
-        cv->color.float32[1]=g;
-        cv->color.float32[2]=b;
-        cv->color.float32[3]=a;
+        cv->color.float32[0]=cc.r;
+        cv->color.float32[1]=cc.g;
+        cv->color.float32[2]=cc.b;
+        cv->color.float32[3]=cc.a;
     }
 
     void SetClearDepthStencil(uint32_t index,float d=1.0f,float s=0)