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diff --git a/src/gleem/linalg/MathUtil.java b/src/gleem/linalg/MathUtil.java
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+/*
+ * gleem -- OpenGL Extremely Easy-To-Use Manipulators.
+ * Copyright (C) 1998-2003 Kenneth B. Russell ([email protected])
+ *
+ * Copying, distribution and use of this software in source and binary
+ * forms, with or without modification, is permitted provided that the
+ * following conditions are met:
+ *
+ * Distributions of source code must reproduce the copyright notice,
+ * this list of conditions and the following disclaimer in the source
+ * code header files; and Distributions of binary code must reproduce
+ * the copyright notice, this list of conditions and the following
+ * disclaimer in the documentation, Read me file, license file and/or
+ * other materials provided with the software distribution.
+ *
+ * The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
+ * holder 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, NON-INTERFERENCE, ACCURACY OF
+ * INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
+ * COPYRIGHT HOLDER, 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 THE
+ * COPYRIGHT HOLDER, 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 ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
+ * DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
+ * OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
+ * HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
+ * WARRANTY OF FITNESS FOR SUCH USES.
+ */
+
+package gleem.linalg;
+
+/** Utility math routines. */
+
+public class MathUtil {
+  /** Makes an arbitrary vector perpendicular to <B>src</B> and
+      inserts it into <B>dest</B>. Returns false if the source vector
+      was equal to (0, 0, 0). */
+  public static boolean makePerpendicular(Vec3f src,
+                                          Vec3f dest) {
+    if ((src.x() == 0.0f) && (src.y() == 0.0f) && (src.z() == 0.0f)) {
+      return false;
+    }
+
+    if (src.x() != 0.0f) {
+      if (src.y() != 0.0f) {
+	dest.set(-src.y(), src.x(), 0.0f);
+      }	else {
+	dest.set(-src.z(), 0.0f, src.x());
+      }
+    } else {
+      dest.set(1.0f, 0.0f, 0.0f);
+    }
+    return true;
+  }
+
+  /** Returns 1 if the sign of the given argument is positive; -1 if
+      negative; 0 if 0. */
+  public static int sgn(float f) {
+    if (f > 0) {
+      return 1;
+    } else if (f < 0) {
+      return -1;
+    }
+    return 0;
+  }
+
+  /** Clamps argument between min and max values. */
+  public static float clamp(float val, float min, float max) {
+    if (val < min) return min;
+    if (val > max) return max;
+    return val;
+  }
+
+  /** Clamps argument between min and max values. */
+  public static int clamp(int val, int min, int max) {
+    if (val < min) return min;
+    if (val > max) return max;
+    return val;
+  }
+}