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diff --git a/APEX_1.4/include/UserRenderSurfaceBufferDesc.h b/APEX_1.4/include/UserRenderSurfaceBufferDesc.h
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+++ b/APEX_1.4/include/UserRenderSurfaceBufferDesc.h
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+/*
+ * Copyright (c) 2008-2015, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * NVIDIA CORPORATION and its licensors retain all intellectual property
+ * and proprietary rights in and to this software, related documentation
+ * and any modifications thereto.  Any use, reproduction, disclosure or
+ * distribution of this software and related documentation without an express
+ * license agreement from NVIDIA CORPORATION is strictly prohibited.
+ */
+
+
+#ifndef USER_RENDER_SURFACE_BUFFER_DESC_H
+#define USER_RENDER_SURFACE_BUFFER_DESC_H
+
+/*!
+\file
+\brief class UserRenderSurfaceBufferDesc, structs RenderDataFormat and RenderSurfaceSemantic
+*/
+
+#include "ApexUsingNamespace.h"
+#include "UserRenderResourceManager.h"
+#include "RenderDataFormat.h"
+#include "ApexSDK.h"
+
+namespace physx
+{
+	class PxCudaContextManager;
+}
+
+namespace nvidia
+{
+namespace apex
+{
+
+PX_PUSH_PACK_DEFAULT
+
+/**
+\brief Describes the semantics and layout of a Surface buffer
+*/
+class UserRenderSurfaceBufferDesc
+{
+public:
+	UserRenderSurfaceBufferDesc(void)
+	{
+		setDefaults();
+	}
+
+	/**
+	\brief Default values
+	*/
+	void setDefaults()
+	{
+//		hint   = RenderBufferHint::STATIC;		
+		format = RenderDataFormat::UNSPECIFIED;
+		
+		width = 0;
+		height = 0;
+		depth = 1;
+
+		//moduleIdentifier = 0;
+		
+		registerInCUDA = false;
+		interopContext = 0;
+//		stride = 0;
+	}
+
+	/**
+	\brief Checks if the surface buffer descriptor is valid
+	*/
+	bool isValid(void) const
+	{
+		uint32_t numFailed = 0;
+		numFailed += (format == RenderDataFormat::UNSPECIFIED);
+		numFailed += (width == 0) && (height == 0) && (depth == 0);
+		numFailed += registerInCUDA && (interopContext == 0);
+//		numFailed += registerInCUDA && (stride == 0);
+		
+		return (numFailed == 0);
+	}
+
+public:
+	/**
+	\brief The size of U-dimension.
+	*/
+	uint32_t				width;
+	
+	/**
+	\brief The size of V-dimension.
+	*/
+	uint32_t				height;
+
+	/**
+	\brief The size of W-dimension.
+	*/
+	uint32_t				depth;
+
+	/**
+	\brief Data format of suface buffer.
+	*/
+	RenderDataFormat::Enum	format;
+
+	bool					registerInCUDA;  //!< Declare if the resource must be registered in CUDA upon creation
+
+	/**
+	This context must be used to register and unregister the resource every time the
+	device is lost and recreated.
+	*/
+	PxCudaContextManager*	interopContext;
+};
+
+PX_POP_PACK
+
+}
+} // end namespace nvidia::apex
+
+#endif // USER_RENDER_SURFACE_BUFFER_DESC_H