diff --git a/LiveScanServer/OpenGLWindow.cs b/LiveScanServer/OpenGLWindow.cs
index 4063659..f8969e7 100644
--- a/LiveScanServer/OpenGLWindow.cs
+++ b/LiveScanServer/OpenGLWindow.cs
@@ -55,6 +55,8 @@ namespace KinectServer
         float dx = 0.0f;
         float dy = 0.0f;
 
+        byte brightnessModifier = 0;
+
         Vector2 MousePrevious = new Vector2();
         Vector2 MouseCurrent = new Vector2();
         float[] cameraPosition = new float[3];
@@ -69,6 +71,8 @@ namespace KinectServer
         DateTime tFPSUpdateTimer = DateTime.Now;
         int nTickCounter = 0;
 
+        bool bDrawMarkings = true;
+
         // this struct is used for drawing
         struct VertexC4ubV3f
         {
@@ -112,9 +116,11 @@ namespace KinectServer
                 WindowBorder = WindowBorder.Resizable;
                 WindowState = WindowState.Normal;
                 ClientSize = new System.Drawing.Size(800, 600);
+                CursorVisible = true;
             }
             else
             {
+                CursorVisible = false;
                 WindowBorder = WindowBorder.Hidden;
                 WindowState = WindowState.Fullscreen;
             }
@@ -123,7 +129,39 @@ namespace KinectServer
 
         void OnKeyDown(object sender, KeyboardKeyEventArgs e)
         {
-//            e.Key
+
+            var keyboard = e.Keyboard;
+            if (keyboard[Key.Escape])
+            {
+                Exit();
+            }
+            if (keyboard[Key.Plus])
+            {
+                PointSize += 0.1f;
+                GL.PointSize(PointSize);
+            }
+            if (keyboard[Key.Minus])
+            {
+                if (PointSize != 0)
+                    PointSize -= 0.1f;
+                GL.PointSize(PointSize);
+            }
+            if (keyboard[Key.W])
+                cameraPosition[2] -= KEYBOARD_MOVE_SPEED;
+            if (keyboard[Key.A])
+                cameraPosition[0] -= KEYBOARD_MOVE_SPEED;
+            if (keyboard[Key.S])
+                cameraPosition[2] += KEYBOARD_MOVE_SPEED;
+            if (keyboard[Key.D])
+                cameraPosition[0] += KEYBOARD_MOVE_SPEED;
+            if (keyboard[Key.F])
+                ToggleFullscreen();
+            if (keyboard[Key.M])
+                bDrawMarkings = !bDrawMarkings;
+            if (keyboard[Key.O])
+                brightnessModifier = (byte)Math.Max(0, brightnessModifier - 10);
+            if (keyboard[Key.P])
+                brightnessModifier = (byte)Math.Min(255, brightnessModifier + 10);
         }
 
         /// <summary>Load resources here.</summary>
@@ -284,72 +322,53 @@ namespace KinectServer
                 nTickCounter = 0;
             }
 
-            var keyboard = OpenTK.Input.Keyboard.GetState();
-            if (keyboard[Key.Escape])
-            {
-                Exit();
-            }
-            if (keyboard[Key.Plus])
-            {
-                PointSize += 0.1f;
-                GL.PointSize(PointSize);
-            }
-            if (keyboard[Key.Minus])
-            {
-                if (PointSize != 0)
-                    PointSize -= 0.1f;
-                GL.PointSize(PointSize);
-            }
-            if (keyboard[Key.W])
-                cameraPosition[2] -= KEYBOARD_MOVE_SPEED;
-            if (keyboard[Key.A])
-                cameraPosition[0] -= KEYBOARD_MOVE_SPEED;
-            if (keyboard[Key.S])
-                cameraPosition[2] += KEYBOARD_MOVE_SPEED;
-            if (keyboard[Key.D])
-                cameraPosition[0] += KEYBOARD_MOVE_SPEED;
-            if (keyboard[Key.F])
-                ToggleFullscreen();
 
             lock (vertices)
             {
                 bool bShowSkeletons = settings.bShowSkeletons;
 
                 PointCount = vertices.Count / 3;
-                //bounding box
-                LineCount = 12;
-                //markers
-                LineCount += settings.lMarkerPoses.Count * 3;
-                //cameras
-                LineCount += cameraPoses.Count * 3;
-                if (bShowSkeletons)
-                    LineCount += 24 * bodies.Count;
+                LineCount = 0;
+                if (bDrawMarkings)
+                {
+                    //bounding box
+                    LineCount += 12;
+                    //markers
+                    LineCount += settings.lMarkerPoses.Count * 3;
+                    //cameras
+                    LineCount += cameraPoses.Count * 3;
+                    if (bShowSkeletons)
+                        LineCount += 24 * bodies.Count;
+                }
 
                 VBO = new VertexC4ubV3f[PointCount + 2 * LineCount];
 
                 for (int i = 0; i < PointCount; i++)
                 {
-                    VBO[i].R = (byte)colors[i * 3];
-                    VBO[i].G = (byte)colors[i * 3 + 1];
-                    VBO[i].B = (byte)colors[i * 3 + 2];
+                    VBO[i].R = (byte)Math.Max(0, Math.Min(255, (colors[i * 3] + brightnessModifier)));
+                    VBO[i].G = (byte)Math.Max(0, Math.Min(255, (colors[i * 3 + 1] + brightnessModifier)));
+                    VBO[i].B = (byte)Math.Max(0, Math.Min(255, (colors[i * 3 + 2] + brightnessModifier)));
                     VBO[i].A = 255;
                     VBO[i].Position.X = vertices[i * 3];
                     VBO[i].Position.Y = vertices[i * 3 + 1];
                     VBO[i].Position.Z = vertices[i * 3 + 2];
                 }
 
-                int iCurLineCount = 0;
-                iCurLineCount += AddBoundingBox(PointCount + 2 * iCurLineCount);
-                for (int i = 0; i < settings.lMarkerPoses.Count; i++)
+                if (bDrawMarkings)
                 {
-                    iCurLineCount += AddMarker(PointCount + 2 * iCurLineCount, settings.lMarkerPoses[i].pose);
+                    int iCurLineCount = 0;
+                    iCurLineCount += AddBoundingBox(PointCount + 2 * iCurLineCount);
+                    for (int i = 0; i < settings.lMarkerPoses.Count; i++)
+                    {
+                        iCurLineCount += AddMarker(PointCount + 2 * iCurLineCount, settings.lMarkerPoses[i].pose);
+                    }
+                    for (int i = 0; i < cameraPoses.Count; i++)
+                    {
+                        iCurLineCount += AddCamera(PointCount + 2 * iCurLineCount, cameraPoses[i]);
+                    }
+                    if (bShowSkeletons)
+                        iCurLineCount += AddBodies(PointCount + 2 * iCurLineCount);
                 }
-                for (int i = 0; i < cameraPoses.Count; i++)
-                {
-                    iCurLineCount += AddCamera(PointCount + 2 * iCurLineCount, cameraPoses[i]);
-                }
-                if (bShowSkeletons)
-                    iCurLineCount += AddBodies(PointCount + 2 * iCurLineCount);
             }
         }