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diff --git a/demo/d3d11/diffuseRenderD3D11.h b/demo/d3d11/diffuseRenderD3D11.h
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+++ b/demo/d3d11/diffuseRenderD3D11.h
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+/*
+ * Copyright (c) 2008-2017, 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.
+ */
+
+#pragma once
+
+#include <DirectXMath.h>
+
+#include "shadowMapD3D11.h"
+#include "../include/NvFlex.h"
+#include "../d3d/renderParamsD3D.h"
+#include "shaders.h"
+
+#include <wrl.h>
+using namespace Microsoft::WRL;
+
+// vertex buffers for diffuse particles
+struct DiffuseRenderBuffersD3D11
+{
+	DiffuseRenderBuffersD3D11() :
+		m_positionsBuf(nullptr),
+		m_velocitiesBuf(nullptr)
+	{
+		m_numParticles = 0;
+	}
+
+	~DiffuseRenderBuffersD3D11()
+	{
+		if (m_numParticles > 0)
+		{
+			NvFlexUnregisterD3DBuffer(m_positionsBuf);
+			NvFlexUnregisterD3DBuffer(m_velocitiesBuf);
+		}
+	}
+
+	int m_numParticles;
+
+	ComPtr<ID3D11Buffer> m_positions;
+	ComPtr<ID3D11Buffer> m_velocities;
+	
+	NvFlexBuffer* m_positionsBuf;
+	NvFlexBuffer* m_velocitiesBuf;
+};
+
+struct DiffuseRendererD3D11
+{
+	void init(ID3D11Device* device, ID3D11DeviceContext* deviceContext);
+	
+	void draw(const DiffuseDrawParamsD3D* params, ID3D11Buffer* positions, ID3D11Buffer* velocities, int numParticles);
+
+	DiffuseRendererD3D11():
+		m_device(nullptr),
+		m_deviceContext(nullptr)
+	{}
+
+	ID3D11Device* m_device;
+	ID3D11DeviceContext* m_deviceContext;
+
+	ComPtr<ID3D11InputLayout> m_inputLayout;
+
+	ComPtr<ID3D11VertexShader> m_diffuseVs;
+	ComPtr<ID3D11GeometryShader> m_diffuseGs;
+	ComPtr<ID3D11PixelShader> m_diffusePs;
+
+	ComPtr<ID3D11Buffer> m_constantBuffer;
+	ComPtr<ID3D11RasterizerState> m_rasterizerState;
+
+	ComPtr<ID3D11BlendState> m_blendState;
+	ComPtr<ID3D11DepthStencilState> m_depthStencilState;
+};