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diff --git a/o3d/samples/o3d-webgl/draw_pass.js b/o3d/samples/o3d-webgl/draw_pass.js
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+/*
+ * Copyright 2010, Google 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions 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 Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+/**
+ * A DrawPass renders a DrawList.
+ * 
+ * @param {o3d.DrawList} drawList The DrawList used by this DrawPass.
+ * @param {o3d.DrawPass.SortMethod} sortMethod ParamInteger The method
+ *     of sorting this DrawPass.
+ * @constructor
+ */
+o3d.DrawPass = function(opt_drawList, opt_sortMethod) {
+  this.drawList = opt_drawList;
+  this.sortMethod = opt_sortMethod || o3d.DrawList.BY_PERFORMANCE;
+};
+o3d.inherit('DrawPass', 'RenderNode');
+
+
+/**
+ * The DrawList for this DrawPass.
+ * @type {o3d.DrawList}
+ */
+o3d.DrawPass.prototype.drawList = null;
+
+
+/**
+ * @type {number}
+ */
+o3d.DrawPass.SortMethod = goog.typedef;
+
+
+/**
+ * The sort method for this DrawPass to draw the DrawList by.
+ * Default = BY_PERFORMANCE.
+ * @type {o3d.DrawList.SortMethod}
+ */
+o3d.DrawPass.prototype.sortMethod = o3d.DrawList.BY_PERFORMANCE;
+
+/**
+ * Called in rendergraph traversal before children are rendered.
+ */
+o3d.DrawPass.prototype.before = function() {
+  if (this.drawList) {
+    this.drawList.render();
+  }
+};
+
+