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diff --git a/APEX_1.4/include/UserRenderIndexBufferDesc.h b/APEX_1.4/include/UserRenderIndexBufferDesc.h
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+++ b/APEX_1.4/include/UserRenderIndexBufferDesc.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_INDEX_BUFFER_DESC_H
+#define USER_RENDER_INDEX_BUFFER_DESC_H
+
+/*!
+\file
+\brief class UserRenderIndexBufferDesc, structs RenderDataFormat and UserRenderIndexBufferDesc
+*/
+
+#include "RenderDataFormat.h"
+#include "UserRenderResourceManager.h"
+
+namespace physx
+{
+	class PxCudaContextManager;
+};
+
+namespace nvidia
+{
+namespace apex
+{
+
+PX_PUSH_PACK_DEFAULT
+
+#if !PX_PS4
+	#pragma warning(push)
+	#pragma warning(disable:4121)
+#endif	//!PX_PS4
+
+/**
+\brief describes the semantics and layout of an index buffer
+*/
+class UserRenderIndexBufferDesc
+{
+public:
+	UserRenderIndexBufferDesc(void)
+	{
+		registerInCUDA = false;
+		interopContext = 0;
+		maxIndices = 0;
+		hint       = RenderBufferHint::STATIC;
+		format     = RenderDataFormat::UNSPECIFIED;
+		primitives = RenderPrimitiveType::TRIANGLES;
+	}
+
+	/**
+	\brief Check if parameter's values are correct
+	*/
+	bool isValid(void) const
+	{
+		uint32_t numFailed = 0;
+		numFailed += (registerInCUDA && !interopContext) ? 1 : 0;
+		return (numFailed == 0);
+	}
+
+public:
+
+	/**
+	\brief The maximum amount of indices this buffer will ever hold.
+	*/
+	uint32_t					maxIndices;
+
+	/**
+	\brief Hint on how often this buffer is updated
+	*/
+	RenderBufferHint::Enum		hint;
+
+	/**
+	\brief The format of this buffer (only one implied semantic)
+	*/
+	RenderDataFormat::Enum		format;
+
+	/**
+	\brief Rendering primitive type (triangle, line strip, etc)
+	*/
+	RenderPrimitiveType::Enum	primitives;
+
+	/**
+	\brief Declare if the resource must be registered in CUDA upon creation
+	*/
+	bool						registerInCUDA;
+
+	/**
+	\brief The CUDA context
+
+	This context must be used to register and unregister the resource every time the
+	device is lost and recreated.
+	*/
+	PxCudaContextManager*		interopContext;
+};
+
+#if !PX_PS4
+	#pragma warning(pop)
+#endif	//!PX_PS4
+
+PX_POP_PACK
+
+}
+} // end namespace nvidia::apex
+
+#endif // USER_RENDER_INDEX_BUFFER_DESC_H