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diff --git a/src/demos/dualDepthPeeling/Model.java b/src/demos/dualDepthPeeling/Model.java
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+
+// Translated from C++ Version:
+// nvModel.h - Model support class
+//
+// The nvModel class implements an interface for a multipurpose model
+// object. This class is useful for loading and formatting meshes
+// for use by OpenGL. It can compute face normals, tangents, and
+// adjacency information. The class supports the obj file format.
+//
+// Author: Evan Hart
+// Email: [email protected]
+//
+// Copyright (c) NVIDIA Corporation. All rights reserved.
+////////////////////////////////////////////////////////////////////////////////
+
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.net.URL;
+import java.nio.FloatBuffer;
+import java.nio.IntBuffer;
+import java.util.HashMap;
+import java.util.Vector;
+
+
+public class Model {
+	//
+	// Enumeration of primitive types
+	//
+	//////////////////////////////////////////////////////////////
+	public enum PrimType {
+		eptNone(0x0),
+		eptPoints(0x1),
+		eptEdges(0x2),
+		eptTriangles(0x4),
+		eptTrianglesWithAdjacency(0x8),
+		eptAll(0xf);
+
+		PrimType( int val )
+		{
+			m_iVal = val;
+		}
+		int m_iVal = 0;
+	};
+
+	public static final int NumPrimTypes = 4;
+
+	public Model CreateModel()
+	{
+		return new Model();
+	}
+
+	public Model()
+	{
+		posSize_ = 0;
+		pOffset_ = -1;
+		nOffset_ = -1;
+		vtxSize_ = 0;
+		openEdges_ = 0;
+	}
+
+
+	public class IdxSet {
+		Integer pIndex = 0;
+		Integer nIndex = 0;
+
+		boolean lessThan ( IdxSet rhs ) 
+		{
+			if (pIndex < rhs.pIndex)
+				return true;
+			else if (pIndex == rhs.pIndex) {
+				if (nIndex < rhs.nIndex)
+					return true;
+			}
+			return false;
+		}
+	};
+
+
+	//
+	// loadModelFromFile
+	//
+	//    This function attempts to determine the type of
+	//  the filename passed as a parameter. If it understands
+	//  that file type, it attempts to parse and load the file
+	//  into its raw data structures. If the file type is
+	//  recognized and successfully parsed, the function returns
+	//  true, otherwise it returns false.
+	//
+	//////////////////////////////////////////////////////////////
+	public boolean loadModelFromFile( String file ) {
+		URL fileURL = getClass().getClassLoader().getResource(File.separator + file);
+		if ( fileURL != null )
+		{
+			BufferedReader input = null;
+			try {
+
+				input = new BufferedReader(new InputStreamReader(fileURL.openStream()));
+				String line = null;
+				float[] val = new float[4];
+				int[][] idx = new int[3][3];
+				boolean hasNormals = false;
+
+				while ( (line = input.readLine()) != null) {
+					switch (line.charAt(0)) {
+					case '#':
+						break;
+
+					case 'v':
+						switch (line.charAt(1)) {
+
+						case ' ':
+							line = line.substring( line.indexOf( " " ) + 1 );
+							//vertex, 3 or 4 components
+							val[0] = Float.valueOf( line.substring( 0, line.indexOf( " " ) ) );
+							line = line.substring( line.indexOf( " " ) + 1 );
+							val[1] = Float.valueOf( line.substring( 0, line.indexOf( " " ) ) );
+							line = line.substring( line.indexOf( " " ) + 1 );
+							val[2] = Float.valueOf( line );
+							positions_.add( val[0]);
+							positions_.add( val[1]);
+							positions_.add( val[2]);
+							break;
+
+						case 'n':
+							//normal, 3 components
+							line = line.substring( line.indexOf( " " ) + 1 );
+							val[0] = Float.valueOf( line.substring( 0, line.indexOf( " " ) ) );
+							line = line.substring( line.indexOf( " " ) + 1 );
+							val[1] = Float.valueOf( line.substring( 0, line.indexOf( " " ) ) );
+							line = line.substring( line.indexOf( " " ) + 1 );
+							val[2] = Float.valueOf( line );
+							normals_.add( val[0]);
+							normals_.add( val[1]);
+							normals_.add( val[2]);
+							break;
+						}
+						break;
+
+					case 'f':
+						//face
+						line = line.substring( line.indexOf( " " ) + 2 );
+						
+						idx[0][0] = Integer.valueOf( line.substring( 0, line.indexOf("//") ) ).intValue();
+						line = line.substring( line.indexOf( "//" ) + 2 );
+						idx[0][1] = Integer.valueOf( line.substring( 0, line.indexOf(" ") ) ).intValue();
+
+						{ 
+							//This face has vertex and normal indices
+
+							// in .obj, f v1 .... the vertex index used start from 1, so -1 here
+							//remap them to the right spot
+							idx[0][0] = (idx[0][0] > 0) ? (idx[0][0] - 1) : ((int)positions_.size() - idx[0][0]);
+							idx[0][1] = (idx[0][1] > 0) ? (idx[0][1] - 1) : ((int)normals_.size() - idx[0][1]);
+
+							//grab the second vertex to prime
+							line = line.substring( line.indexOf( " " ) + 1 );
+							idx[1][0] = Integer.valueOf( line.substring( 0, line.indexOf("//") ) );
+							line = line.substring( line.indexOf( "//" ) + 2 );
+							idx[1][1] = Integer.valueOf( line.substring( 0, line.indexOf(" ") ) );
+
+							//remap them to the right spot
+							idx[1][0] = (idx[1][0] > 0) ? (idx[1][0] - 1) : ((int)positions_.size() - idx[1][0]);
+							idx[1][1] = (idx[1][1] > 0) ? (idx[1][1] - 1) : ((int)normals_.size() - idx[1][1]);
+
+							//grab the third vertex to prime
+							line = line.substring( line.indexOf( " " ) + 1 );
+							idx[2][0] = Integer.valueOf( line.substring( 0, line.indexOf("//") ) );
+							line = line.substring( line.indexOf( "//" ) + 2 );
+							idx[2][1] = Integer.valueOf( line );
+							{
+								//remap them to the right spot
+								idx[2][0] = (idx[2][0] > 0) ? (idx[2][0] - 1) : ((int)positions_.size() - idx[2][0]);
+								idx[2][1] = (idx[2][1] > 0) ? (idx[2][1] - 1) : ((int)normals_.size() - idx[2][1]);
+
+								//add the indices
+								for (int ii = 0; ii < 3; ii++) {
+									pIndex_.add( idx[ii][0]);
+									nIndex_.add( idx[ii][1]);
+								}
+
+								//prepare for the next iteration, the num 0 does not change.
+								idx[1][0] = idx[2][0];
+								idx[1][1] = idx[2][1];
+							}
+							hasNormals = true;
+						}
+						break;
+
+					default:
+						break;
+					};								
+				}			
+				//post-process data
+				//free anything that ended up being unused
+				if (!hasNormals) {
+					normals_.clear();
+					nIndex_.clear();
+				}
+
+				posSize_ = 3;
+				return true;
+				
+			} catch (FileNotFoundException kFNF) {
+				System.err.println("Unable to find the shader file " + file);
+			} catch (IOException kIO) {
+				System.err.println("Problem reading the shader file " + file);
+			} catch (NumberFormatException kIO) {
+				System.err.println("Problem reading the shader file " + file);
+			} finally {
+				try {
+					if (input != null) {
+						input.close();
+					}
+				} catch (IOException closee) {}
+			}
+		}
+		return false;
+	}
+
+	//
+	//  compileModel
+	//
+	//    This function takes the raw model data in the internal
+	//  structures, and attempts to bring it to a format directly
+	//  accepted for vertex array style rendering. This means that
+	//  a unique compiled vertex will exist for each unique
+	//  combination of position, normal, tex coords, etc that are
+	//  used in the model. The prim parameter, tells the model
+	//  what type of index list to compile. By default it compiles
+	//  a simple triangle mesh with no connectivity. 
+	//
+	public void compileModel( )
+	{
+		boolean needsTriangles = true;
+
+		HashMap<IdxSet, Integer> pts = new HashMap<IdxSet, Integer>();
+		vertices_ = FloatBuffer.allocate( (pIndex_.size() + nIndex_.size()) * 3 );
+		indices_ = IntBuffer.allocate( pIndex_.size() );
+		for ( int i = 0; i < pIndex_.size(); i++  ) {
+			IdxSet idx = new IdxSet();
+			idx.pIndex = pIndex_.elementAt(i);
+
+			if ( normals_.size() > 0)
+				idx.nIndex = nIndex_.elementAt(i);
+			else
+				idx.nIndex = 0;
+
+			if ( !pts.containsKey(idx) ) {
+				if (needsTriangles)
+					indices_.put( pts.size());
+
+				pts.put( idx, pts.size() );
+
+				//position, 
+				vertices_.put( positions_.elementAt(idx.pIndex*posSize_));
+				vertices_.put( positions_.elementAt(idx.pIndex*posSize_ + 1));
+				vertices_.put( positions_.elementAt(idx.pIndex*posSize_ + 2));
+
+				//normal
+				if (normals_.size() > 0) {
+					vertices_.put( normals_.elementAt(idx.nIndex*3));
+					vertices_.put( normals_.elementAt(idx.nIndex*3 + 1));
+					vertices_.put( normals_.elementAt(idx.nIndex*3 + 2));
+				}
+
+			}
+			else {                	
+				if (needsTriangles)
+					indices_.put( pts.get(idx) );
+			}
+		}
+
+		//create selected prim
+
+		//set the offsets and vertex size
+		pOffset_ = 0; //always first
+		vtxSize_ = posSize_;
+		if ( hasNormals()) {
+			nOffset_ = vtxSize_;
+			vtxSize_ += 3;
+		}
+		else {
+			nOffset_ = -1;
+		}
+		vertices_.rewind();
+		indices_.rewind();
+	}
+
+	//
+	//  computeBoundingBox
+	//
+	//    This function returns the points defining the axis-
+	//  aligned bounding box containing the model.
+	//
+	//////////////////////////////////////////////////////////////
+	public void computeBoundingBox( float[] minVal, float[] maxVal)
+	{
+		if ( positions_.isEmpty())
+			return;
+		
+		for ( int i = 0; i < 3; i++ )
+		{
+			minVal[i] = 1e10f;
+			maxVal[i] = -1e10f;
+		}
+
+
+		for ( int i = 0; i < positions_.size(); i+= 3 ) {
+			float x = positions_.elementAt(i);
+			float y = positions_.elementAt(i+1);
+			float z = positions_.elementAt(i+2);
+			minVal[0] = Math.min( minVal[0], x );
+			minVal[1] = Math.min( minVal[1], y );
+			minVal[2] = Math.min( minVal[2], z );
+			maxVal[0] = Math.max( maxVal[0], x );
+			maxVal[1] = Math.max( maxVal[1], y );
+			maxVal[2] = Math.max( maxVal[2], z );
+		}
+	}
+
+
+	public void clearNormals()
+	{
+		normals_.clear();
+		nIndex_.clear();
+	}
+
+
+	public boolean hasNormals()  {
+		return normals_.size() > 0;
+	}
+
+
+	public int getPositionSize()  {
+		return posSize_;
+	}
+
+	public int getNormalSize()  {
+		return 3;
+	}
+
+	public Vector<Float> getPositions()  {
+		return ( positions_.size() > 0) ? positions_ : null;
+	}
+
+	public Vector<Float> getNormals()  {
+		return ( normals_.size() > 0) ? normals_ : null;
+	}
+
+	public Vector<Integer> getPositionIndices()  {
+		return ( pIndex_.size() > 0) ? pIndex_: null;
+	}
+
+	public Vector<Integer> getNormalIndices()  {
+		return ( nIndex_.size() > 0) ? nIndex_ : null;
+	}
+
+	public int getPositionCount()  {
+		return (posSize_ > 0) ? (int)positions_.size() / posSize_ : 0;
+	}
+
+	public int getNormalCount()  {
+		return (int)normals_.size() / 3;
+	}
+
+	public int getIndexCount()  {
+		return (int)pIndex_.size();
+	}
+
+	public FloatBuffer getCompiledVertices()  {
+		return vertices_;
+	}
+
+	public IntBuffer getCompiledIndices( )  {
+		return indices_;
+	}
+
+	public int getCompiledPositionOffset()  {
+		return pOffset_;
+	}
+
+	public int getCompiledNormalOffset()  {
+		return nOffset_;
+	}
+
+
+	public int getCompiledVertexSize()  {
+		return vtxSize_;
+	}
+
+	public int getCompiledVertexCount()  {
+		return ((pIndex_.size() + nIndex_.size()) * 3);
+	}
+
+	public int getCompiledIndexCount( )  {
+		return pIndex_.size();
+	}
+
+	public int getOpenEdgeCount()  {
+		return openEdges_;
+	}
+
+
+
+	Vector<Float> positions_ = new Vector<Float>();
+	Vector<Float> normals_ = new Vector<Float>();
+	int posSize_;
+
+	Vector<Integer> pIndex_ = new Vector<Integer>();
+	Vector<Integer> nIndex_ = new Vector<Integer>();
+
+	//data structures optimized for rendering, compiled model
+	IntBuffer indices_ = null;
+	FloatBuffer vertices_ = null;  
+	int pOffset_;
+	int nOffset_;
+	int vtxSize_ = 0;
+
+	int openEdges_;
+};