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diff --git a/APEX_1.4/include/UserRenderIndexBuffer.h b/APEX_1.4/include/UserRenderIndexBuffer.h
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+++ b/APEX_1.4/include/UserRenderIndexBuffer.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_H
+#define USER_RENDER_INDEX_BUFFER_H
+
+/*!
+\file
+\brief class UserRenderIndexBuffer
+*/
+
+#include "ApexUsingNamespace.h"
+
+/**
+\brief Cuda graphics resource
+*/
+typedef struct CUgraphicsResource_st* CUgraphicsResource;
+
+namespace nvidia
+{
+namespace apex
+{
+
+PX_PUSH_PACK_DEFAULT
+
+/**
+\brief Used for storing index data for rendering.
+*/
+class UserRenderIndexBuffer
+{
+public:
+	virtual		~UserRenderIndexBuffer() {}
+
+	///Get the low-level handle of the buffer resource (D3D resource pointer or GL buffer object ID)
+	///\return true id succeeded, false otherwise
+	virtual bool getInteropResourceHandle(CUgraphicsResource& handle)
+#if APEX_DEFAULT_NO_INTEROP_IMPLEMENTATION
+	{
+		PX_UNUSED(&handle);
+		return false;
+	}
+#else
+	= 0;
+#endif
+
+	//! write some data into the buffer.
+	//  the source data type is assumed to be the same as what was defined in the descriptor.
+	virtual void writeBuffer(const void* srcData, uint32_t srcStride, uint32_t firstDestElement, uint32_t numElements) = 0;
+};
+
+PX_POP_PACK
+
+}
+} // namespace nvidia::apex
+
+#endif // USER_RENDER_INDEX_BUFFER_H