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diff --git a/src/demos/particles/engine/Engine.java b/src/demos/particles/engine/Engine.java
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+/*
+ * Copyright (c) 2006 Ben Chappell ([email protected]) All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *   
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *    
+ * - Redistribution in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *   
+ * The names of Ben Chappell, Sun Microsystems, Inc. or the names of
+ * contributors may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *    
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. BEN CHAPPELL,
+ * SUN MICROSYSTEMS, INC. ("SUN"), AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL BEN
+ * CHAPPELL, SUN, OR SUN'S LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT 
+ * OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR
+ * PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF BEN
+ * CHAPPELL OR SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ *   
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ */
+
+package demos.particles.engine;
+
+import javax.media.opengl.*;
+import com.sun.opengl.util.texture.*;
+import java.net.*;
+import java.util.*;
+import java.io.*;
+
+public class Engine {
+
+  private Texture texture;
+  private List/*<Particle>*/ particles;
+  private String path;
+  public RGBA tendToColor;
+    
+  public Engine(int numParticles, String path) {
+    this.path=path;
+        
+    tendToColor = new RGBA(1.0f, 1.0f, 1.0f, 1.0f);
+        
+    particles = new ArrayList/*<Particle>*/(numParticles);
+    for(int i=0; i<numParticles; i++)
+      particles.add(new Particle());
+  }
+    
+  public void addParticle() {
+    particles.add(new Particle());
+  }
+    
+  public void removeParticle() {
+    if(particles.size()-1 >= 0)
+      particles.remove(particles.size()-1);
+  }
+    
+  public void draw(GL2 gl) {
+        
+    gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
+    gl.glLoadIdentity();      
+        
+    for(int i=0; i<particles.size(); i++) {
+      ((Particle) particles.get(i)).draw(gl, texture, tendToColor);
+    }
+  }
+    
+  public void init() {               
+    try {
+      ClassLoader c1 = this.getClass().getClassLoader();
+      URL url = c1.getResource(path);
+      texture = TextureIO.newTexture(url, false, null);
+      texture.enable();
+    }
+    catch(IOException e) {
+      e.printStackTrace();
+    }
+    catch(GLException e) {
+      e.printStackTrace();
+    }
+  }
+    
+  public void reset() {
+    int numParticles = particles.size();
+    particles = new ArrayList/*<Particle>*/(numParticles);
+    for(int i=0; i<numParticles; i++)
+      particles.add(new Particle());
+  }
+
+}