diff --git a/core/VolumeReader.cpp b/core/VolumeReader.cpp
index 0a9b506..b0fe17a 100644
--- a/core/VolumeReader.cpp
+++ b/core/VolumeReader.cpp
@@ -8,7 +8,7 @@
 #include "VolumeReader.h"
 
 #define STB_IMAGE_WRITE_IMPLEMENTATION
-#include "utils/std_image_write.h"
+#include "utils/stb_image_write.h"
 
 void VolumeReader::Read(std::string filename)
 {
diff --git a/gui/canvas.cpp b/gui/canvas.cpp
index 72fb8ec..911e8e4 100644
--- a/gui/canvas.cpp
+++ b/gui/canvas.cpp
@@ -3,6 +3,7 @@
 //
 
 #include "canvas.h"
+#include "utils/stb_image_write.h"
 
 Canvas::Canvas(const QGLFormat &format, QWidget *parent) : QGLWidget(format, parent)
 {
@@ -93,6 +94,14 @@ void Canvas::paintGL()
     else
     {
         render_pathtracer(img, renderParams);
+        if(renderParams.frameNo == 0)
+        {
+            char* data = new char[WIDTH * HEIGHT * 4];
+            cudaMemcpy(data, img, sizeof(glm::u8vec4) * WIDTH * HEIGHT, cudaMemcpyDeviceToHost);
+
+            stbi_write_tga("0.tga", WIDTH, HEIGHT, 4, data);
+            delete []data;
+        }
     }
     checkCudaErrors(cudaDeviceSynchronize());
 
@@ -109,6 +118,7 @@ void Canvas::paintGL()
 
 void Canvas::mousePressEvent(QMouseEvent *e)
 {
+    this->setFocus();
     if((e->buttons() & Qt::LeftButton) || (e->buttons() & Qt::MidButton))
     {
         mouseStartPoint = PixelPosToViewPos(e->posF());
@@ -184,4 +194,33 @@ void Canvas::ZoomToExtent()
     auto maxSpan = fmaxf(extent.x, fmaxf(extent.y, extent.z));
     maxSpan *= 1.5f;       // enlarge it slightly
     eyeDist = maxSpan / (2 * tan(glm::radians(fov * 0.5f)));
-}
\ No newline at end of file
+}
+void Canvas::keyPressEvent(QKeyEvent *e)
+{
+    if(e->key() == Qt::Key_Down)
+    {
+        viewMat = glm::rotate(viewMat, static_cast<float>(glm::radians(180.f)), glm::vec3(0.f, 1.f, 0.f));
+
+        UpdateCamera();
+        updateGL();
+        ReStartRender();
+    }
+    else if(e->key() == Qt::Key_Left)
+    {
+        viewMat = glm::rotate(viewMat, static_cast<float>(glm::radians(90.f)), glm::vec3(0.f, 1.f, 0.f));
+
+        UpdateCamera();
+        updateGL();
+        ReStartRender();
+    }
+    else if(e->key() == Qt::Key_Right)
+    {
+        viewMat = glm::rotate(viewMat, static_cast<float>(glm::radians(-90.f)), glm::vec3(0.f, 1.f, 0.f));
+
+        UpdateCamera();
+        updateGL();
+        ReStartRender();
+    }
+
+    QWidget::keyPressEvent(e);
+}
diff --git a/gui/canvas.h b/gui/canvas.h
index 7a39b1e..4bd0b78 100644
--- a/gui/canvas.h
+++ b/gui/canvas.h
@@ -191,6 +191,8 @@ class Canvas : public QGLWidget
     void mouseMoveEvent(QMouseEvent* e);
     void wheelEvent(QWheelEvent* e);
 
+    void keyPressEvent(QKeyEvent *e);
+
     // timer
     void timerEvent(QTimerEvent* e) {this->update();}
 
diff --git a/gui/mainwindow.cpp b/gui/mainwindow.cpp
index 8a078e0..dd0af8a 100644
--- a/gui/mainwindow.cpp
+++ b/gui/mainwindow.cpp
@@ -75,6 +75,9 @@ void MainWindow::ConfigureTransferFunction()
 
     connect(ui->SliderWidget_DensityScale, SIGNAL(valueChanged(double)), this, SLOT(onDensityScaleChanged(double)));
     connect(ui->SliderWidget_GradientFactor, SIGNAL(valueChanged(double)), this, SLOT(onGradientFactorChanged(double)));
+
+    connect(ui->pushButton_saveTF, SIGNAL(clicked()), this, SLOT(onSaveTF()));
+    connect(ui->pushButton_loadTF, SIGNAL(clicked()), this, SLOT(onLoadTF()));
 }
 
 void MainWindow::onTransferFunctionChanged()
@@ -478,3 +481,21 @@ void MainWindow::onGradientFactorChanged(double g)
 {
     canvas->SetGradientFactor(g);
 }
+
+void MainWindow::onSaveTF()
+{
+    //QString filename = QFileDialog::getSaveFileName(this, tr("Save TF"), "", tr("TF file (*.tf)"));
+    //if(!filename.isNull())
+    //{
+        tf->SaveCurrentTFConfiguration();
+    //}
+}
+
+void MainWindow::onLoadTF()
+{
+    //QString filename = QFileDialog::getOpenFileName(this, tr("Load TF"), "", tr("TF file (*.tf)"));
+    //if(!filename.isNull())
+    //{
+        tf->LoadExistingTFConfiguration();
+    //}
+}
diff --git a/gui/mainwindow.h b/gui/mainwindow.h
index 103c716..ba5f677 100644
--- a/gui/mainwindow.h
+++ b/gui/mainwindow.h
@@ -75,6 +75,9 @@ private slots:
     void onYClipChanged(double min, double max);
     void onZClipChanged(double min, double max);
 
+    void onSaveTF();
+    void onLoadTF();
+
 
 private:
     Ui::MainWindow *ui;
diff --git a/gui/mainwindow.ui b/gui/mainwindow.ui
index becd54b..8566024 100644
--- a/gui/mainwindow.ui
+++ b/gui/mainwindow.ui
@@ -110,9 +110,9 @@
             <property name="geometry">
              <rect>
               <x>0</x>
-              <y>-180</y>
+              <y>-216</y>
               <width>363</width>
-              <height>766</height>
+              <height>808</height>
              </rect>
             </property>
             <layout class="QVBoxLayout" name="verticalLayout_3">
@@ -250,6 +250,24 @@
                   </property>
                  </widget>
                 </item>
+                <item>
+                 <layout class="QGridLayout" name="gridLayout_8">
+                  <item row="0" column="0">
+                   <widget class="QPushButton" name="pushButton_saveTF">
+                    <property name="text">
+                     <string>SaveTF</string>
+                    </property>
+                   </widget>
+                  </item>
+                  <item row="0" column="1">
+                   <widget class="QPushButton" name="pushButton_loadTF">
+                    <property name="text">
+                     <string>LoadTF</string>
+                    </property>
+                   </widget>
+                  </item>
+                 </layout>
+                </item>
                </layout>
               </widget>
              </item>
@@ -315,7 +333,7 @@
              <rect>
               <x>0</x>
               <y>0</y>
-              <width>363</width>
+              <width>237</width>
               <height>689</height>
              </rect>
             </property>
@@ -655,8 +673,8 @@
              <rect>
               <x>0</x>
               <y>0</y>
-              <width>378</width>
-              <height>550</height>
+              <width>245</width>
+              <height>204</height>
              </rect>
             </property>
             <layout class="QVBoxLayout" name="verticalLayout_10">
@@ -781,8 +799,8 @@
              <rect>
               <x>0</x>
               <y>0</y>
-              <width>378</width>
-              <height>550</height>
+              <width>124</width>
+              <height>168</height>
              </rect>
             </property>
             <layout class="QVBoxLayout" name="verticalLayout_12">
diff --git a/utils/std_image_write.h b/utils/stb_image_write.h
similarity index 100%
rename from utils/std_image_write.h
rename to utils/stb_image_write.h