diff --git a/app/node/CMakeLists.txt b/app/node/CMakeLists.txt
index 2d433e223..662a8e73f 100644
--- a/app/node/CMakeLists.txt
+++ b/app/node/CMakeLists.txt
@@ -16,6 +16,7 @@
 
 add_subdirectory(generator)
 add_subdirectory(output)
+add_subdirectory(processor)
 
 set(OLIVE_SOURCES
   ${OLIVE_SOURCES}
diff --git a/app/node/generator/solid/solid.cpp b/app/node/generator/solid/solid.cpp
index 3fac44ea9..97e7bd4b2 100644
--- a/app/node/generator/solid/solid.cpp
+++ b/app/node/generator/solid/solid.cpp
@@ -1,14 +1,45 @@
 #include "solid.h"
 
 SolidGenerator::SolidGenerator(QObject *parent) :
-  Node(parent)
+  Node(parent),
+  texture_(nullptr)
 {
+  texture_output_ = new NodeOutput(this);
+  texture_output_->set_data_type(NodeOutput::kTexture);
+}
 
+QString SolidGenerator::Name()
+{
+  return tr("Solid");
+}
+
+QString SolidGenerator::Category()
+{
+  return tr("Generator");
+}
+
+QString SolidGenerator::Description()
+{
+  return tr("Generate a solid color.");
+}
+
+NodeOutput *SolidGenerator::texture_output()
+{
+  return texture_output_;
 }
 
 void SolidGenerator::Process(const rational &time)
 {
   Q_UNUSED(time)
 
+  // FIXME: Test code
+  if (texture_ == nullptr) {
+    QImage img(1920, 1080, QImage::Format_RGBA8888_Premultiplied);
+    img.fill(Qt::red);
 
+    texture_ = new QOpenGLTexture(img);
+  }
+
+  texture_output_->set_value(texture_->textureId());
+  // End test code
 }
diff --git a/app/node/generator/solid/solid.h b/app/node/generator/solid/solid.h
index 742999d85..50e7af114 100644
--- a/app/node/generator/solid/solid.h
+++ b/app/node/generator/solid/solid.h
@@ -1,17 +1,29 @@
 #ifndef SOLIDGENERATOR_H
 #define SOLIDGENERATOR_H
 
+#include <QOpenGLTexture>
+
 #include "node/node.h"
 
 class SolidGenerator : public Node
 {
+  Q_OBJECT
 public:
   SolidGenerator(QObject* parent = nullptr);
 
+  virtual QString Name() override;
+  virtual QString Category() override;
+  virtual QString Description() override;
+
+  NodeOutput* texture_output();
+
+public slots:
   virtual void Process(const rational &time) override;
 
 private:
   NodeOutput* texture_output_;
+
+  QOpenGLTexture* texture_;
 };
 
 #endif // SOLIDGENERATOR_H
diff --git a/app/node/node.cpp b/app/node/node.cpp
index 23080ce1a..2159d236f 100644
--- a/app/node/node.cpp
+++ b/app/node/node.cpp
@@ -24,3 +24,48 @@ Node::Node(QObject *parent) :
   QObject(parent)
 {
 }
+
+QString Node::Category()
+{
+  // Return an empty category for any nodes that don't use one
+  return QString();
+}
+
+QString Node::Description()
+{
+  // Return an empty string by default
+  return QString();
+}
+
+void Node::InvalidateCache(const rational &start_range, const rational &end_range)
+{
+  Q_UNUSED(start_range)
+  Q_UNUSED(end_range)
+
+  /*
+  ParamList params = Parameters();
+
+  for (int i=0;i<params.size();i++) {
+    NodeParam* param = params.at(i);
+
+    if (param->type() == NodeParam::kOutput
+        && param->) {
+
+    }
+  }
+  */
+}
+
+Node::ParamList Node::Parameters()
+{
+  const QObjectList& child_list = children();
+
+  ParamList params;
+  params.reserve(child_list.size());
+
+  for (int i=0;i<child_list.size();i++) {
+    params[i] = static_cast<NodeParam*>(child_list.at(i));
+  }
+
+  return params;
+}
diff --git a/app/node/node.h b/app/node/node.h
index 7b6253ac0..423f3c421 100644
--- a/app/node/node.h
+++ b/app/node/node.h
@@ -23,14 +23,27 @@
 
 #include <QObject>
 
-#include "node/param.h"
+#include "node/input.h"
+#include "node/output.h"
 #include "rational.h"
 
 class Node : public QObject
 {
+  Q_OBJECT
 public:
   Node(QObject* parent = nullptr);
 
+  virtual QString Name() = 0;
+  virtual QString Category();
+  virtual QString Description();
+
+  virtual void InvalidateCache(const rational& start_range, const rational& end_range);
+
+  using ParamList = QList<NodeParam *>;
+
+  ParamList Parameters();
+
+public slots:
   virtual void Process(const rational& time) = 0;
 };
 
diff --git a/app/node/output/viewer/viewer.cpp b/app/node/output/viewer/viewer.cpp
index f03f83730..424de91f0 100644
--- a/app/node/output/viewer/viewer.cpp
+++ b/app/node/output/viewer/viewer.cpp
@@ -1,6 +1,57 @@
 #include "viewer.h"
 
+#include "panel/panelfocusmanager.h"
+
 ViewerOutput::ViewerOutput(QObject* parent) :
-  Node(parent)
+  Node(parent),
+  attached_viewer_(nullptr)
 {
+  texture_input_ = new NodeInput(this);
+  texture_input_->add_data_input(NodeInput::kTexture);
+}
+
+QString ViewerOutput::Name()
+{
+  return tr("Viewer");
+}
+
+QString ViewerOutput::Category()
+{
+  return tr("Output");
+}
+
+QString ViewerOutput::Description()
+{
+  return tr("Interface between a Viewer panel and the node system.");
+}
+
+NodeInput *ViewerOutput::texture_input()
+{
+  return texture_input_;
+}
+
+void ViewerOutput::Process(const rational &time)
+{
+  if (attached_viewer_ != nullptr) {
+    // Get the texture from whatever Node is currently connected (usually a Renderer of some kind)
+    GLuint current_texture = texture_input_->get_value(time).value<GLuint>();
+
+    // Send the texture to the Viewer
+    attached_viewer_->SetTexture(current_texture);
+  }
+}
+
+void ViewerOutput::AttachViewer(ViewerPanel *viewer)
+{
+  // Disconnect old viewer if there's one attached
+  if (attached_viewer_ != nullptr) {
+    disconnect(attached_viewer_, SIGNAL(TimeChanged(const rational&)), this, SLOT(Process(const rational&)));
+  }
+
+  // FIXME: Currently this attaches to ViewerPanels, but should it attached to Viewers instead?
+  attached_viewer_ = viewer;
+
+  if (attached_viewer_ != nullptr) {
+    connect(attached_viewer_, SIGNAL(TimeChanged(const rational&)), this, SLOT(Process(const rational&)));
+  }
 }
diff --git a/app/node/output/viewer/viewer.h b/app/node/output/viewer/viewer.h
index d480e5e52..88269f4b4 100644
--- a/app/node/output/viewer/viewer.h
+++ b/app/node/output/viewer/viewer.h
@@ -2,14 +2,29 @@
 #define VIEWER_H
 
 #include "node/node.h"
+#include "panel/viewer/viewer.h"
 
 class ViewerOutput : public Node
 {
+  Q_OBJECT
 public:
   ViewerOutput(QObject* parent = nullptr);
 
+  virtual QString Name() override;
+  virtual QString Category() override;
+  virtual QString Description() override;
+
+  NodeInput* texture_input();
+
+  void AttachViewer(ViewerPanel* viewer);
+
+public slots:
+  virtual void Process(const rational &time) override;
+
 private:
   NodeInput* texture_input_;
+
+  ViewerPanel* attached_viewer_;
 };
 
 #endif // VIEWER_H
diff --git a/app/render/renderer/CMakeLists.txt b/app/node/processor/CMakeLists.txt
similarity index 85%
rename from app/render/renderer/CMakeLists.txt
rename to app/node/processor/CMakeLists.txt
index 14071a2fb..090aa2040 100644
--- a/app/render/renderer/CMakeLists.txt
+++ b/app/node/processor/CMakeLists.txt
@@ -14,11 +14,9 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+add_subdirectory(renderer)
+
 set(OLIVE_SOURCES
   ${OLIVE_SOURCES}
-  render/renderer/renderer.h
-  render/renderer/renderer.cpp
-  render/renderer/rendererthread.h
-  render/renderer/rendererthread.cpp
   PARENT_SCOPE
 )
diff --git a/app/node/processor/renderer/CMakeLists.txt b/app/node/processor/renderer/CMakeLists.txt
new file mode 100644
index 000000000..6f78b5cc4
--- /dev/null
+++ b/app/node/processor/renderer/CMakeLists.txt
@@ -0,0 +1,24 @@
+# Olive - Non-Linear Video Editor
+# Copyright (C) 2019 Olive Team
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+set(OLIVE_SOURCES
+  ${OLIVE_SOURCES}
+  node/processor/renderer/renderer.h
+  node/processor/renderer/renderer.cpp
+  node/processor/renderer/rendererthread.h
+  node/processor/renderer/rendererthread.cpp
+  PARENT_SCOPE
+)
diff --git a/app/render/renderer/renderer.cpp b/app/node/processor/renderer/renderer.cpp
similarity index 69%
rename from app/render/renderer/renderer.cpp
rename to app/node/processor/renderer/renderer.cpp
index 315fb4c7c..ca8f26ef5 100644
--- a/app/render/renderer/renderer.cpp
+++ b/app/node/processor/renderer/renderer.cpp
@@ -20,13 +20,29 @@
 
 #include "renderer.h"
 
-Renderer::Renderer() :
+RendererProcessor::RendererProcessor(QObject *parent) :
+  Node(parent),
   started_(false)
 {
 
 }
 
-void Renderer::Start()
+QString RendererProcessor::Name()
+{
+  return tr("Renderer");
+}
+
+QString RendererProcessor::Category()
+{
+  return tr("Processor");
+}
+
+QString RendererProcessor::Description()
+{
+  return tr("A multi-threaded OpenGL hardware-accelerated node compositor.");
+}
+
+void RendererProcessor::Start()
 {
   if (started_) {
     return;
@@ -42,7 +58,7 @@ void Renderer::Start()
   started_ = true;
 }
 
-void Renderer::Stop()
+void RendererProcessor::Stop()
 {
   if (!started_) {
     return;
@@ -58,13 +74,7 @@ void Renderer::Stop()
   threads_.clear();
 }
 
-/*RendererThread *Renderer::CurrentThread()
+RendererThread *RendererProcessor::CurrentThread()
 {
-  for (int i=0;i<threads_.size();i++) {
-    if (threads_.at(i) == QThread::currentThread()) {
-      return threads_.at(i);
-    }
-  }
-
-  return nullptr;
-}*/
+  return dynamic_cast<RendererThread*>(QThread::currentThread());
+}
diff --git a/app/node/processor/renderer/renderer.h b/app/node/processor/renderer/renderer.h
new file mode 100644
index 000000000..b5bb8f323
--- /dev/null
+++ b/app/node/processor/renderer/renderer.h
@@ -0,0 +1,87 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2019 Olive Team
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+***/
+
+#ifndef RENDERER_H
+#define RENDERER_H
+
+#include "node/node.h"
+#include "rendererthread.h"
+
+class RendererProcessor : public Node
+{
+  Q_OBJECT
+public:
+  /**
+   * @brief Renderer Constructor
+   *
+   * Constructing a Renderer object will not start any threads/backend on its own. Use Start() to do this and Stop()
+   * when the Renderer is about to be destroyed.
+   */
+  RendererProcessor(QObject* parent = nullptr);
+
+  virtual QString Name() override;
+  virtual QString Category() override;
+  virtual QString Description() override;
+
+  /**
+   * @brief Set parameters of the Renderer
+   *
+   * The Renderer owns the buffers that are used in the rendering process and this function sets the kind of buffers
+   * to use. The Renderer must be stopped when calling this function.
+   *
+   * @param width
+   *
+   * Buffer width
+   *
+   * @param height
+   *
+   * Buffer height
+   *
+   * @param format
+   *
+   * Buffer pixel format
+   */
+  void SetParameters(const int& width, const int& height, const olive::PixelFormat& format);
+
+  /**
+   * @brief Allocate and start the multithreaded backend
+   */
+  void Start();
+
+  /**
+   * @brief Terminate and deallocate the multithreaded backend
+   */
+  void Stop();
+
+  /**
+   * @brief Return current instance of a RenderThread (or nullptr if there is none)
+   *
+   * This function attempts a dynamic_cast on QThread::currentThread() to RendererThread, which will return nullptr if
+   * the cast fails (e.g. if this function is called from the main thread rather than a RendererThread).
+   */
+  static RendererThread* CurrentThread();
+
+private:
+  QVector<RendererThread*> threads_;
+
+  bool started_;
+};
+
+#endif // RENDERER_H
diff --git a/app/render/renderer/rendererthread.cpp b/app/node/processor/renderer/rendererthread.cpp
similarity index 100%
rename from app/render/renderer/rendererthread.cpp
rename to app/node/processor/renderer/rendererthread.cpp
diff --git a/app/render/renderer/rendererthread.h b/app/node/processor/renderer/rendererthread.h
similarity index 100%
rename from app/render/renderer/rendererthread.h
rename to app/node/processor/renderer/rendererthread.h
diff --git a/app/panel/viewer/viewer.cpp b/app/panel/viewer/viewer.cpp
index 04683be36..2d48c118f 100644
--- a/app/panel/viewer/viewer.cpp
+++ b/app/panel/viewer/viewer.cpp
@@ -20,21 +20,25 @@
 
 #include "viewer.h"
 
-#include "widget/viewer/viewer.h"
-
 ViewerPanel::ViewerPanel(QWidget *parent) :
   PanelWidget(parent)
 {
   // QObject system handles deleting this
-  ViewerWidget* viewer = new ViewerWidget(this);
+  viewer_ = new ViewerWidget(this);
+  connect(viewer_, SIGNAL(TimeChanged(const rational&)), this, SIGNAL(TimeChanged(const rational&)));
 
   // Set ViewerWidget as the central widget
-  setWidget(viewer);
+  setWidget(viewer_);
 
   // Set strings
   Retranslate();
 }
 
+void ViewerPanel::SetTexture(GLuint tex)
+{
+  viewer_->SetTexture(tex);
+}
+
 void ViewerPanel::changeEvent(QEvent *e)
 {
   if (e->type() == QEvent::LanguageChange) {
diff --git a/app/panel/viewer/viewer.h b/app/panel/viewer/viewer.h
index 181441864..eb5eba7e3 100644
--- a/app/panel/viewer/viewer.h
+++ b/app/panel/viewer/viewer.h
@@ -21,7 +21,10 @@
 #ifndef VIEWER_PANEL_H
 #define VIEWER_PANEL_H
 
+#include <QOpenGLFunctions>
+
 #include "widget/panel/panel.h"
+#include "widget/viewer/viewer.h"
 
 /**
  * @brief Dockable wrapper around a ViewerWidget
@@ -31,11 +34,26 @@ class ViewerPanel : public PanelWidget {
 public:
   ViewerPanel(QWidget* parent);
 
+public slots:
+  /**
+   * @brief Set the texture to draw and draw it
+   *
+   * Wrapper function for Viewer::SetTexture().
+   *
+   * @param tex
+   */
+  void SetTexture(GLuint tex);
+
 protected:
   virtual void changeEvent(QEvent* e) override;
 
+signals:
+  void TimeChanged(const rational&);
+
 private:
   void Retranslate();
+
+  ViewerWidget* viewer_;
 };
 
 #endif // VIEWER_PANEL_H
diff --git a/app/render/CMakeLists.txt b/app/render/CMakeLists.txt
index d5c5b2286..3161ab4ff 100644
--- a/app/render/CMakeLists.txt
+++ b/app/render/CMakeLists.txt
@@ -15,7 +15,6 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 add_subdirectory(gl)
-add_subdirectory(renderer)
 
 set(OLIVE_SOURCES
   ${OLIVE_SOURCES}
diff --git a/app/render/renderer/renderer.h b/app/render/renderer/renderer.h
deleted file mode 100644
index 57178022f..000000000
--- a/app/render/renderer/renderer.h
+++ /dev/null
@@ -1,43 +0,0 @@
-/***
-
-  Olive - Non-Linear Video Editor
-  Copyright (C) 2019 Olive Team
-
-  This program is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-***/
-
-#ifndef RENDERER_H
-#define RENDERER_H
-
-#include "render/renderer/rendererthread.h"
-
-class Renderer
-{
-public:
-  Renderer();
-
-  void Start();
-
-  void Stop();
-
-  //RendererThread* CurrentThread();
-
-private:
-  QVector<RendererThread*> threads_;
-
-  bool started_;
-};
-
-#endif // RENDERER_H
diff --git a/app/widget/playbackcontrols/playbackcontrols.cpp b/app/widget/playbackcontrols/playbackcontrols.cpp
index a4a0e4bf4..b71595004 100644
--- a/app/widget/playbackcontrols/playbackcontrols.cpp
+++ b/app/widget/playbackcontrols/playbackcontrols.cpp
@@ -64,26 +64,31 @@ PlaybackControls::PlaybackControls(QWidget *parent) :
   QPushButton* go_to_start_btn = new QPushButton();
   go_to_start_btn->setIcon(olive::icon::GoToStart);
   lower_middle_layout->addWidget(go_to_start_btn);
+  connect(go_to_start_btn, SIGNAL(clicked(bool)), this, SIGNAL(BeginClicked()));
 
   // Prev Frame Button
   QPushButton* prev_frame_btn = new QPushButton();
   prev_frame_btn->setIcon(olive::icon::PrevFrame);
   lower_middle_layout->addWidget(prev_frame_btn);
+  connect(prev_frame_btn, SIGNAL(clicked(bool)), this, SIGNAL(PrevFrameClicked()));
 
   // Play/Pause Button
   QPushButton* play_btn = new QPushButton();
   play_btn->setIcon(olive::icon::Play);
   lower_middle_layout->addWidget(play_btn);
+  connect(play_btn, SIGNAL(clicked(bool)), this, SIGNAL(PlayClicked()));
 
   // Next Frame Button
   QPushButton* next_frame_btn = new QPushButton();
   next_frame_btn->setIcon(olive::icon::NextFrame);
   lower_middle_layout->addWidget(next_frame_btn);
+  connect(next_frame_btn, SIGNAL(clicked(bool)), this, SIGNAL(NextFrameClicked()));
 
   // Go To End Button
   QPushButton* go_to_end_btn = new QPushButton();
   go_to_end_btn->setIcon(olive::icon::GoToEnd);
   lower_middle_layout->addWidget(go_to_end_btn);
+  connect(go_to_end_btn, SIGNAL(clicked(bool)), this, SIGNAL(EndClicked()));
 
   lower_middle_layout->addStretch();
 
diff --git a/app/widget/playbackcontrols/playbackcontrols.h b/app/widget/playbackcontrols/playbackcontrols.h
index 59c5aee4e..ffb747c9b 100644
--- a/app/widget/playbackcontrols/playbackcontrols.h
+++ b/app/widget/playbackcontrols/playbackcontrols.h
@@ -31,6 +31,7 @@
  */
 class PlaybackControls : public QWidget
 {
+  Q_OBJECT
 public:
   PlaybackControls(QWidget* parent);
 
diff --git a/app/widget/viewer/viewer.cpp b/app/widget/viewer/viewer.cpp
index 802fa5718..1ac4139c8 100644
--- a/app/widget/viewer/viewer.cpp
+++ b/app/widget/viewer/viewer.cpp
@@ -40,4 +40,18 @@ ViewerWidget::ViewerWidget(QWidget *parent) :
   controls_->SetTimecodeEnabled(true);
   controls_->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Maximum);
   layout->addWidget(controls_);
+
+  // FIXME: Test code
+  connect(controls_, SIGNAL(PlayClicked()), this, SLOT(TemporaryTestFunction()));
+  // End test code
+}
+
+void ViewerWidget::SetTexture(GLuint tex)
+{
+  gl_widget_->SetTexture(tex);
+}
+
+void ViewerWidget::TemporaryTestFunction()
+{
+  emit TimeChanged(69);
 }
diff --git a/app/widget/viewer/viewer.h b/app/widget/viewer/viewer.h
index 6cd1325ae..f45425408 100644
--- a/app/widget/viewer/viewer.h
+++ b/app/widget/viewer/viewer.h
@@ -25,6 +25,7 @@
 #include <QPushButton>
 #include <QLabel>
 
+#include "rational.h"
 #include "viewerglwidget.h"
 #include "widget/playbackcontrols/playbackcontrols.h"
 
@@ -39,10 +40,25 @@ public:
 
   void SetPlaybackControlsEnabled(bool enabled);
 
+public slots:
+  /**
+   * @brief Set the texture to draw and draw it
+   *
+   * Wrapper function for ViewerGLWidget::SetTexture().
+   *
+   * @param tex
+   */
+  void SetTexture(GLuint tex);
+
+signals:
+  void TimeChanged(const rational&);
+
 private:
   ViewerGLWidget* gl_widget_;
   PlaybackControls* controls_;
 
+private slots:
+  void TemporaryTestFunction();
 };
 
 #endif // VIEWER_WIDGET_H
diff --git a/app/widget/viewer/viewerglwidget.h b/app/widget/viewer/viewerglwidget.h
index a84d6ac38..61e589f98 100644
--- a/app/widget/viewer/viewerglwidget.h
+++ b/app/widget/viewer/viewerglwidget.h
@@ -52,14 +52,16 @@ public:
    */
   ViewerGLWidget(QWidget* parent);
 
+public slots:
   /**
    * @brief Set the texture to draw and draw it
    *
-   * Use this function
+   * Use this function to update the viewer.
    *
    * @param tex
    */
   void SetTexture(GLuint tex);
+
 protected:
   /**
    * @brief Initialize function to set up the OpenGL context upon its construction
diff --git a/app/window/mainwindow/mainwindow.cpp b/app/window/mainwindow/mainwindow.cpp
index c3a463617..193f9f2f3 100644
--- a/app/window/mainwindow/mainwindow.cpp
+++ b/app/window/mainwindow/mainwindow.cpp
@@ -32,6 +32,11 @@
 // Main menu bar
 #include "mainmenu.h"
 
+// FIXME: Test code
+#include "node/output/viewer/viewer.h"
+#include "node/generator/solid/solid.h"
+// End test code
+
 olive::MainWindow::MainWindow(QWidget *parent) :
   QMainWindow(parent)
 {
@@ -73,4 +78,11 @@ void olive::MainWindow::ProjectOpen(Project* p)
 
   TimelinePanel* timeline_panel = new TimelinePanel(this);
   addDockWidget(Qt::BottomDockWidgetArea, timeline_panel);
+
+  // FIXME: Test code
+  ViewerOutput* vo = new ViewerOutput(this);
+  vo->AttachViewer(viewer_panel2);
+  SolidGenerator* sg = new SolidGenerator(this);
+  NodeInput::ConnectEdge(sg->texture_output(), vo->texture_input());
+  // End test code
 }