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diff --git a/src/gleem/linalg/Vec4f.java b/src/gleem/linalg/Vec4f.java
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+++ b/src/gleem/linalg/Vec4f.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;
+
+/** 4-element single-precision vector */
+
+public class Vec4f {
+  private float x;
+  private float y;
+  private float z;
+  private float w;
+
+  public Vec4f() {}
+
+  public Vec4f(Vec4f arg) {
+    set(arg);
+  }
+
+  public Vec4f(float x, float y, float z, float w) {
+    set(x, y, z, w);
+  }
+
+  public Vec4f copy() {
+    return new Vec4f(this);
+  }
+
+  public void set(Vec4f arg) {
+    set(arg.x, arg.y, arg.z, arg.w);
+  }
+
+  public void set(float x, float y, float z, float w) {
+    this.x = x;
+    this.y = y;
+    this.z = z;
+    this.w = w;
+  }
+
+  /** Sets the ith component, 0 <= i < 4 */
+  public void set(int i, float val) {
+    switch (i) {
+    case 0: x = val; break;
+    case 1: y = val; break;
+    case 2: z = val; break;
+    case 3: w = val; break;
+    default: throw new IndexOutOfBoundsException();
+    }
+  }
+
+  /** Gets the ith component, 0 <= i < 4 */
+  public float get(int i) {
+    switch (i) {
+    case 0: return x;
+    case 1: return y;
+    case 2: return z;
+    case 3: return w;
+    default: throw new IndexOutOfBoundsException();
+    }
+  }
+
+  public float x() { return x; }
+  public float y() { return y; }
+  public float z() { return z; }
+  public float w() { return w; }
+
+  public void setX(float x) { this.x = x; }
+  public void setY(float y) { this.y = y; }
+  public void setZ(float z) { this.z = z; }
+  public void setW(float w) { this.w = w; }
+
+  public float dot(Vec4f arg) {
+    return x * arg.x + y * arg.y + z * arg.z + w * arg.w;
+  }
+
+  public float length() {
+    return (float) Math.sqrt(lengthSquared());
+  }
+
+  public float lengthSquared() {
+    return this.dot(this);
+  }
+
+  public void normalize() {
+    float len = length();
+    if (len == 0.0f) return;
+    scale(1.0f / len);
+  }
+
+  /** Returns this * val; creates new vector */
+  public Vec4f times(float val) {
+    Vec4f tmp = new Vec4f(this);
+    tmp.scale(val);
+    return tmp;
+  }
+
+  /** this = this * val */
+  public void scale(float val) {
+    x *= val;
+    y *= val;
+    z *= val;
+    w *= val;
+  }
+
+  /** Returns this + arg; creates new vector */
+  public Vec4f plus(Vec4f arg) {
+    Vec4f tmp = new Vec4f();
+    tmp.add(this, arg);
+    return tmp;
+  }
+
+  /** this = this + b */
+  public void add(Vec4f b) {
+    add(this, b);
+  }
+
+  /** this = a + b */
+  public void add(Vec4f a, Vec4f b) {
+    x = a.x + b.x;
+    y = a.y + b.y;
+    z = a.z + b.z;
+    w = a.w + b.w;
+  }
+
+  /** Returns this + s * arg; creates new vector */
+  public Vec4f addScaled(float s, Vec4f arg) {
+    Vec4f tmp = new Vec4f();
+    tmp.addScaled(this, s, arg);
+    return tmp;
+  }
+
+  /** this = a + s * b */
+  public void addScaled(Vec4f a, float s, Vec4f b) {
+    x = a.x + s * b.x;
+    y = a.y + s * b.y;
+    z = a.z + s * b.z;
+    w = a.w + s * b.w;
+  }
+
+  /** Returns this - arg; creates new vector */
+  public Vec4f minus(Vec4f arg) {
+    Vec4f tmp = new Vec4f();
+    tmp.sub(this, arg);
+    return tmp;
+  }
+
+  /** this = this - b */
+  public void sub(Vec4f b) {
+    sub(this, b);
+  }
+
+  /** this = a - b */
+  public void sub(Vec4f a, Vec4f b) {
+    x = a.x - b.x;
+    y = a.y - b.y;
+    z = a.z - b.z;
+    w = a.w - b.w;
+  }
+
+  /** Sets each component of this vector to the product of the
+      component with the corresponding component of the argument
+      vector. */
+  public void componentMul(Vec4f arg) {
+    x *= arg.x;
+    y *= arg.y;
+    z *= arg.z;
+    w *= arg.w;
+  }
+
+  public Vecf toVecf() {
+    Vecf out = new Vecf(4);
+    for (int i = 0; i < 4; i++) {
+      out.set(i, get(i));
+    }
+    return out;
+  }
+
+  public String toString() {
+    return "(" + x + ", " + y + ", " + z + ")";
+  }
+}