diff --git a/README.rst b/README.rst
index 265844e3..3540f7e5 100644
--- a/README.rst
+++ b/README.rst
@@ -171,22 +171,6 @@ Both the LASlib and IlmBase libraries may be built using the separate third
 party build system in ``thirdparty/external/CMakeLists.txt``.
 
 
-Build options
-~~~~~~~~~~~~~
-To read the .las and .laz file formats, you'll need one of the following:
-
-* LASlib >= something-recent (known to work with 150406).  This is the default
-  because it's reasonably fast and has no additional library dependencies.
-* PDAL >= something-recent (known to work with 0.1.0-3668-gff73c08).  You may
-  select PDAL by setting the build option ``DISPLAZ_USE_PDAL=TRUE``.  Note that
-  building PDAL also requires several libraries including boost, laszip and
-  GDAL.
-
-If you only want to read ply files (for example, to use the scripting language
-bindings), and don't care about las you may set the build option
-``DISPLAZ_USE_LAS=FALSE``.
-
-
 Supported Systems
 -----------------
 
diff --git a/shaders/las_points_selection.glsl b/shaders/las_points_selection.glsl
index 653934eb..c6e57ffe 100644
--- a/shaders/las_points_selection.glsl
+++ b/shaders/las_points_selection.glsl
@@ -77,6 +77,8 @@ void main()
         else if (classification == 2) classColor = vec3(0.33, 0.18, 0.0);
         else if (classification == 3) classColor = vec3(1.0,  0.0,  0.0);
         else if (classification == 4) classColor = vec3(0.0,  1.0,  1.0);
+        else if (classification == 5) classColor = vec3(0.295, 0.0, 0.5);
+        else if (classification == 6) classColor = vec3(1.0, 0.63, 0.5);
         pointColor = classColor +
                      vec3(0,0,float(rr<selectionRadius)) +
                      tonemap(intensity/400.0, exposure, contrast) * vec3(1);
@@ -227,4 +229,3 @@ void main()
 }
 
 #endif
-
diff --git a/shaders/point_normals.glsl b/shaders/point_normals.glsl
new file mode 100644
index 00000000..10b850c3
--- /dev/null
+++ b/shaders/point_normals.glsl
@@ -0,0 +1,96 @@
+#version 130
+// Copyright 2015, Christopher J. Foster and the other displaz contributors.
+// Use of this code is governed by the BSD-style license found in LICENSE.txt
+
+// This shader allows normals to be supplied with each point, and draws a small
+// line segment in the direction of the normal, centred on the point.
+
+uniform mat4 modelViewMatrix;
+uniform mat4 projectionMatrix;
+uniform mat4 modelViewProjectionMatrix;
+
+//------------------------------------------------------------------------------
+#if defined(VERTEX_SHADER)
+
+uniform float pointSize = 10.0;    //# uiname=Point Size; min=1; max=200
+uniform float minPointSize = 0;
+uniform float maxPointSize = 200.0;
+// Point size multiplier to keep coverage constant when doing stochastic
+// simplification
+uniform float pointSizeLodMultiplier = 1;
+in vec3 position;
+in vec3 normal;
+in vec3 color;
+
+flat out float pointScreenSize;
+flat out vec3 pointColor;
+flat out vec2 lineNormal;
+flat out float lineNormalLen;
+
+void main()
+{
+    vec4 p = modelViewProjectionMatrix * vec4(position,1.0);
+    gl_Position = p;
+    float wInv = 1.0/p.w;
+    // Compute differential of the projection Proj(v) = (A*v).xy / (A*v).w
+    // restricted to the xy plane.  dProj given here has a factor of wInv
+    // removed so that the resulting lineNormalLen is correct for the point
+    // coordinate system (pointScreenSize is effectively absorbing the factor
+    // of wInv).
+    mat3x2 dProj = mat3x2(modelViewProjectionMatrix) -
+                   outerProduct(wInv*p.xy, transpose(modelViewProjectionMatrix)[3].xyz);
+    // Remove aspect ratio - fragment coord system will be square.
+    float aspect = projectionMatrix[1][1]/projectionMatrix[0][0];
+    dProj = mat2x2(aspect, 0, 0, 1) * dProj;
+    vec2 dirProj = dProj*normalize(normal);
+    lineNormalLen = length(dirProj);
+    lineNormal = vec2(-dirProj.y, dirProj.x) / lineNormalLen;
+    pointScreenSize = clamp(20.0*pointSize * wInv * pointSizeLodMultiplier,
+                            minPointSize, maxPointSize);
+    gl_PointSize = pointScreenSize;
+    pointColor = color;
+}
+
+
+//------------------------------------------------------------------------------
+#elif defined(FRAGMENT_SHADER)
+
+uniform float markerWidth = 0.3;  // # uiname=Marker Width; min=0.01; max=1
+
+flat in float pointScreenSize;
+flat in vec3 pointColor;
+flat in vec2 lineNormal;
+flat in float lineNormalLen;
+
+out vec4 fragColor;
+
+// Limit at which the point is rendered as a small square for antialiasing
+// rather than using a specific marker shape
+const float pointScreenSizeLimit = 2;
+
+void main()
+{
+    if (pointScreenSize <= 0)
+        discard;
+    if (pointScreenSize > pointScreenSizeLimit)
+    {
+        float w = markerWidth;
+        if (pointScreenSize < 2*pointScreenSizeLimit)
+        {
+            // smoothly turn on the markers as we get close enough to see them
+            w = mix(1, w, pointScreenSize/pointScreenSizeLimit - 1);
+        }
+        vec2 p = 2*(gl_PointCoord - 0.5);
+        p.y = -p.y;
+        float r = length(p);
+        const float lineRad = 1.0;
+        bool inLine = r*(1-w) < max(0.5*lineNormalLen, 2/pointScreenSize) &&
+                abs(dot(lineNormal,p))*(1-w)*pointScreenSize < lineRad;
+        if (!inLine)
+            discard;
+    }
+    fragColor = vec4(pointColor, 1);
+}
+
+#endif
+
diff --git a/src/gui/PointViewerMainWindow.cpp b/src/gui/PointViewerMainWindow.cpp
index ed6309ac..5eaf4de7 100644
--- a/src/gui/PointViewerMainWindow.cpp
+++ b/src/gui/PointViewerMainWindow.cpp
@@ -154,7 +154,7 @@ PointViewerMainWindow::PointViewerMainWindow(const QGLFormat& format)
     viewMenu->addSeparator();
     QAction* drawBoundingBoxes = viewMenu->addAction(tr("Draw Bounding bo&xes"));
     drawBoundingBoxes->setCheckable(true);
-    drawBoundingBoxes->setChecked(true);
+    drawBoundingBoxes->setChecked(false);
     QAction* drawCursor = viewMenu->addAction(tr("Draw 3D &Cursor"));
     drawCursor->setCheckable(true);
     drawCursor->setChecked(true);
diff --git a/src/render/View3D.cpp b/src/render/View3D.cpp
index 024e39f0..ee40467b 100644
--- a/src/render/View3D.cpp
+++ b/src/render/View3D.cpp
@@ -38,7 +38,7 @@ View3D::View3D(GeometryCollection* geometries, const QGLFormat& format, QWidget
     m_selectionClassFrom(-1),
     m_selectionClassTo(1),
     m_backgroundColor(60, 50, 50),
-    m_drawBoundingBoxes(true),
+    m_drawBoundingBoxes(false),
     m_drawCursor(true),
     m_drawAxes(true),
     m_drawGrid(false),
@@ -645,50 +645,58 @@ void View3D::wheelEvent(QWheelEvent* event)
 
 void View3D::keyPressEvent(QKeyEvent *event)
 {
+    #include <string>
     // Centre camera on current cursor location
     if(event->key() == Qt::Key_C)
     {
         m_camera.setCenter(m_cursorPos);
     }
-    else if(event->key() == Qt::Key_0)
+    else if(!(event->modifiers()& Qt::AltModifier))
     {
-        m_selectionClassTo = 0;
-    }
-    else if(event->key() == Qt::Key_1)
-    {
-        m_selectionClassTo = 1;
-    }
-    else if(event->key() == Qt::Key_2)
-    {
-        m_selectionClassTo = 2;
-    }
-    else if(event->key() == Qt::Key_3)
-    {
-        m_selectionClassTo = 3;
-    }
-    else if(event->key() == Qt::Key_4)
-    {
-        m_selectionClassTo = 4;
-    }
-    else if(event->key() == Qt::Key_5)
-    {
-        m_selectionClassTo = 5;
-    }
-    else if(event->key() == Qt::Key_6)
-    {
-        m_selectionClassTo = 6;
-    }
-    else if(event->key() == Qt::Key_7)
-    {
-        m_selectionClassTo = 7;
-    }
-    else if(event->key() == Qt::Key_8)
-    {
-        m_selectionClassTo = 8;
-    }
-    else if(event->key() == Qt::Key_9)
-    {
-        m_selectionClassTo = 9;
+      if(event->key() == Qt::Key_0)
+      {
+          m_selectionClassTo = 0;
+      }
+      else if(event->key() == Qt::Key_1)
+      {
+          m_selectionClassTo = 1;
+      }
+      else if(event->key() == Qt::Key_2)
+      {
+          m_selectionClassTo = 2;
+      }
+      else if(event->key() == Qt::Key_3)
+      {
+          m_selectionClassTo = 3;
+      }
+      else if(event->key() == Qt::Key_4)
+      {
+          m_selectionClassTo = 4;
+      }
+      else if(event->key() == Qt::Key_5)
+      {
+          m_selectionClassTo = 5;
+      }
+      else if(event->key() == Qt::Key_6)
+      {
+          m_selectionClassTo = 6;
+      }
+      else if(event->key() == Qt::Key_7)
+      {
+          m_selectionClassTo = 7;
+      }
+      else if(event->key() == Qt::Key_8)
+      {
+          m_selectionClassTo = 8;
+      }
+      else if(event->key() == Qt::Key_9)
+      {
+          m_selectionClassTo = 9;
+      }
+      else if(event->modifiers() == 0)
+      {
+        event->ignore();
+      }
     }
     else if(event->key() == Qt::Key_S && (event->modifiers() & Qt::ControlModifier))
     {
@@ -700,6 +708,56 @@ void View3D::keyPressEvent(QKeyEvent *event)
             m_geometries->get()[sel[i].row()]->saveFile(fileName);
         }
     }
+    else if(event->modifiers() & Qt::AltModifier){
+        if(event->key() == Qt::Key_0)
+        {
+            m_selectionClassFrom = 0;
+        }
+        else if(event->key() == Qt::Key_1)
+        {
+            m_selectionClassFrom = 1;
+        }
+        else if(event->key() == Qt::Key_2)
+        {
+            m_selectionClassFrom = 2;
+        }
+        else if(event->key() == Qt::Key_3)
+        {
+            m_selectionClassFrom = 3;
+        }
+        else if(event->key() == Qt::Key_4)
+        {
+            m_selectionClassFrom = 4;
+        }
+        else if(event->key() == Qt::Key_5)
+        {
+            m_selectionClassFrom = 5;
+        }
+        else if(event->key() == Qt::Key_6)
+        {
+            m_selectionClassFrom = 6;
+        }
+        else if(event->key() == Qt::Key_7)
+        {
+            m_selectionClassFrom = 7;
+        }
+        else if(event->key() == Qt::Key_8)
+        {
+            m_selectionClassFrom = 8;
+        }
+        else if(event->key() == Qt::Key_9)
+        {
+            m_selectionClassFrom = 9;
+        }
+        else if(event->key() == Qt::Key_R)
+        {
+            m_selectionClassFrom = 1;
+        }
+        else
+        {
+            event->ignore();
+        }
+    }
     else
     {
         event->ignore();