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diff --git a/o3d/samples/o3d-webgl/clear_buffer.js b/o3d/samples/o3d-webgl/clear_buffer.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 ClearBuffer is a render node that clears the color buffer, zbuffer and/or
+ * stencil buffer of the current render target.
+ * 
+ * @constructor
+ */
+o3d.ClearBuffer = function() {
+  o3d.RenderNode.call(this);
+  this.clearColor = [0, 0, 0, 1];
+};
+o3d.inherit('ClearBuffer', 'RenderNode');
+
+
+
+/**
+ * The color to clear the buffer in RGBA Float4 format.
+ * @type {!o3d.Float4}
+ */
+o3d.ClearBuffer.prototype.clearColor = [0, 0, 0, 1];
+
+
+
+/**
+ * true clears the current render target's color buffer to the clear color.
+ * false does not clear the color buffer.
+ * @type {boolean}
+ */
+o3d.ClearBuffer.prototype.clearColorFlag = true;
+
+
+
+/**
+ * The value to clear the depth buffer (0.0 - 1.0)
+ * @type {number}
+ */
+o3d.ClearBuffer.prototype.clearDepth = 1;
+
+
+
+/**
+ * true clears the current render target's depth buffer to the clear depth
+ * value. false does not clear the depth buffer.
+ * @type {boolean}
+ */
+o3d.ClearBuffer.prototype.clearDepthFlag = true;
+
+
+
+/**
+ * The value to clear the stencil buffer to (0 - 255).
+ * @type {number}
+ */
+o3d.ClearBuffer.prototype.clearStencil = 0;
+
+
+
+/**
+ * true clears the current render target's stencil buffer to the clear stencil
+ * value. false does not clear the stencil buffer
+ * @type {boolean}
+ */
+o3d.ClearBuffer.prototype.clearStencilFlag = true;
+
+
+
+/**
+ * Function called in the render graph traversal before the children are
+ * rendered.
+ */
+o3d.ClearBuffer.prototype.before = function() {
+  var flags = 0;
+
+  this.gl.clearColor(
+      this.clearColor[0],
+      this.clearColor[1],
+      this.clearColor[2],
+      this.clearColor[3]);
+
+  this.gl.clearDepth(this.clearDepth);
+  this.gl.clearStencil(this.clearStencil);
+
+  if (this.clearColorFlag)
+    flags = flags | this.gl.COLOR_BUFFER_BIT;
+  if (this.clearDepthFlag)
+    flags = flags | this.gl.DEPTH_BUFFER_BIT;
+  if (this.clearStencilFlag)
+    flags = flags | this.gl.STENCIL_BUFFER_BIT;
+
+  this.gl.clear(flags);
+};
+
+
+