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diff --git a/src/net/java/joglutils/msg/elements/ProjectionMatrixElement.java b/src/net/java/joglutils/msg/elements/ProjectionMatrixElement.java
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+/*
+ * Copyright (c) 2007 Sun Microsystems, Inc. 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.
+ * 
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may 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. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS 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 SUN OR
+ * ITS 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
+ * 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 net.java.joglutils.msg.elements;
+
+import net.java.joglutils.msg.math.*;
+import net.java.joglutils.msg.misc.*;
+
+/** Represents the projection matrix, which transforms view-space
+    coordinates into screen-space coordinates. */
+
+public class ProjectionMatrixElement extends Element {
+  // Boilerplate
+  private static StateIndex index = State.registerElementType();
+  public StateIndex getStateIndex() { return index; }
+  public Element newInstance() {
+    return new ProjectionMatrixElement();
+  }
+  public static ProjectionMatrixElement getInstance(State state) {
+    return (ProjectionMatrixElement) state.getElement(index);
+  }
+  public static void enable(State defaultState) {
+    Element tmp = new ProjectionMatrixElement();
+    defaultState.setElement(tmp.getStateIndex(), tmp);
+  }
+
+  // The matrix data
+  protected Mat4f matrix;
+
+  public ProjectionMatrixElement() {
+    matrix = new Mat4f();
+    matrix.makeIdent();
+  }
+  
+  /** Returns the current projection matrix; callers should not mutate
+      this directly but instead use the accessor methods to change
+      it. */
+  public Mat4f getMatrix() {
+    return matrix;
+  }
+
+  public void push(State state) {
+    ProjectionMatrixElement prev = (ProjectionMatrixElement) getNextInStack();
+    if (prev != null) {
+      matrix.set(prev.matrix);
+    }
+  }
+
+  /** Sets the projection matrix in the given state to the given one. */
+  public static void set(State state, Mat4f matrix) {
+    ProjectionMatrixElement elt = getInstance(state);
+    elt.setElt(matrix);
+  }
+
+  /** Sets the projection matrix in this element to the given one. */
+  public void setElt(Mat4f matrix) {
+    this.matrix.set(matrix);
+  }
+}