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diff --git a/o3d/core/cross/viewport.cc b/o3d/core/cross/viewport.cc
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+/*
+ * Copyright 2009, 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.
+ */
+
+
+// This file contains the Viewport render node implementation
+
+#include "core/cross/precompile.h"
+#include "core/cross/viewport.h"
+#include "core/cross/renderer.h"
+
+namespace o3d {
+
+O3D_DEFN_CLASS(Viewport, RenderNode);
+
+const char* Viewport::kViewportParamName =
+    O3D_STRING_CONSTANT("viewport");
+const char* Viewport::kDepthRangeParamName =
+    O3D_STRING_CONSTANT("depthRange");
+
+Viewport::Viewport(ServiceLocator* service_locator)
+    : RenderNode(service_locator) {
+  RegisterParamRef(kViewportParamName, &viewport_param_);
+  RegisterParamRef(kDepthRangeParamName, &depth_range_param_);
+
+  set_viewport(Float4(0.0, 0.0f, 1.0f, 1.0f));
+  set_depth_range(Float2(0.0, 1.0f));
+}
+
+ObjectBase::Ref Viewport::Create(ServiceLocator* service_locator) {
+  return ObjectBase::Ref(new Viewport(service_locator));
+}
+
+void Viewport::Render(RenderContext* render_context) {
+  render_context->renderer()->GetViewport(&old_viewport_, &old_depth_range_);
+  render_context->renderer()->SetViewport(viewport(), depth_range());
+}
+
+void Viewport::PostRender(RenderContext* render_context) {
+  render_context->renderer()->SetViewport(old_viewport_, old_depth_range_);
+}
+
+}  // namespace o3d