diff --git a/inc/hgl/graph/vulkan/VK.h b/inc/hgl/graph/vulkan/VK.h
index b2f08098..2c8888fa 100644
--- a/inc/hgl/graph/vulkan/VK.h
+++ b/inc/hgl/graph/vulkan/VK.h
@@ -63,20 +63,6 @@ enum class ShaderType
     Compute     =VK_SHADER_STAGE_COMPUTE_BIT
 };//
 
-struct PushConstant256
-{
-    Matrix4f projection;
-    Matrix4f modelview;
-    Matrix4f mvp;
-    Matrix3f normal;
-};//
-
-struct PushConstant128
-{
-    Matrix4f projection;
-    Matrix4f modelview;
-};//
-
 #ifdef _DEBUG
 bool CheckStrideBytesByFormat();                ///<检验所有数据类型长度数组是否符合规则
 #endif//_DEBUG
diff --git a/inc/hgl/graph/vulkan/VKCommandBuffer.h b/inc/hgl/graph/vulkan/VKCommandBuffer.h
index 25a84301..7071e9ef 100644
--- a/inc/hgl/graph/vulkan/VKCommandBuffer.h
+++ b/inc/hgl/graph/vulkan/VKCommandBuffer.h
@@ -5,6 +5,23 @@
 #include<hgl/graph/vulkan/VKPipeline.h>
 #include<hgl/graph/vulkan/VKDescriptorSets.h>
 VK_NAMESPACE_BEGIN
+//push constant 一般只有128/256字节，仅能存在矩阵。
+//所以我们将每个对象的独立变换矩阵存在push constant中
+
+struct PushConstant256
+{
+    Matrix4f projection;
+    Matrix4f modelview;
+    Matrix4f mvp;
+    Matrix3f normal;
+};//
+
+struct PushConstant128
+{
+    Matrix4f projection;
+    Matrix4f modelview;
+};//
+
 class CommandBuffer
 {
     VkDevice device;
@@ -95,6 +112,9 @@ public:
         vkCmdPushConstants(cmd_buf,pipeline_layout,(VkShaderStageFlagBits)shader_type,offset,size,pValues);
     }
 
+    void PushConstants(const PushConstant256 *pc){vkCmdPushConstants(cmd_buf,pipeline_layout,VK_SHADER_STAGE_VERTEX_BIT,0,sizeof(PushConstant256),pc);}
+    void PushConstants(const PushConstant128 *pc){vkCmdPushConstants(cmd_buf,pipeline_layout,VK_SHADER_STAGE_VERTEX_BIT,0,sizeof(PushConstant128),pc);}
+
     bool Bind(Renderable *);
 
     void SetViewport        (uint32_t first,uint32_t count,const VkViewport *vp)    {vkCmdSetViewport(cmd_buf,first,count,vp);}