diff --git a/examples/osgvolume/osgvolume.cpp b/examples/osgvolume/osgvolume.cpp
index d503575fc..1eef6035f 100644
--- a/examples/osgvolume/osgvolume.cpp
+++ b/examples/osgvolume/osgvolume.cpp
@@ -760,7 +760,7 @@ class FollowMouseCallback : public osgGA::GUIEventHandler, public osg::StateSet:
                         if (_updateSampleDensity && (uniform = stateset->getUniform("sampleDensity"))) 
                         {
                             float value = powf(v,5);
-                            osg::notify(osg::NOTICE)<<"sampleDensity = "<<value<<std::endl;
+                            osg::notify(osg::INFO)<<"sampleDensity = "<<value<<std::endl;
                             uniform->set(value);
                         }
                     }
@@ -1061,7 +1061,7 @@ osg::Node* createShaderModel(ShadingModel shadingModel,
         }
     }
 
-    osg::Uniform* sampleDensity = new osg::Uniform("sampleDensity", 0.01f);
+    osg::Uniform* sampleDensity = new osg::Uniform("sampleDensity", 0.005f);
     stateset->addUniform(sampleDensity);
 
     osg::Uniform* transpancy = new osg::Uniform("transparency",0.5f);
@@ -1794,7 +1794,10 @@ int main( int argc, char **argv )
         osg::ref_ptr<osgGA::KeySwitchMatrixManipulator> keyswitchManipulator = new osgGA::KeySwitchMatrixManipulator;
 
         keyswitchManipulator->addMatrixManipulator( '1', "Trackball", new osgGA::TrackballManipulator() );
-        keyswitchManipulator->addMatrixManipulator( '2', "Flight", new osgGA::FlightManipulator() );
+        
+        osgGA::FlightManipulator* flightManipulator = new osgGA::FlightManipulator();
+        flightManipulator->setYawControlMode(osgGA::FlightManipulator::NO_AUTOMATIC_YAW);
+        keyswitchManipulator->addMatrixManipulator( '2', "Flight", flightManipulator );
 
         viewer.setCameraManipulator( keyswitchManipulator.get() );
     }
@@ -2082,6 +2085,7 @@ int main( int argc, char **argv )
     ySize = (*sizeItr)->t();
     zSize = (*sizeItr)->r();
     ++sizeItr;
+
     for(;sizeItr != images.end(); ++sizeItr)
     {
         if ((*sizeItr)->s() != xSize || 
@@ -2094,25 +2098,30 @@ int main( int argc, char **argv )
     }
 
 
-#if 0
-    osg::RefMatrix* matrix = dynamic_cast<osg::RefMatrix*>(image_3d->getUserData());
+#if 1
+    osg::RefMatrix* matrix = dynamic_cast<osg::RefMatrix*>(images.front()->getUserData());
     if (matrix)
     {
         osg::notify(osg::NOTICE)<<"Image has Matrix = "<<*matrix<<std::endl;
-        xSize = image_3d->s() * (*matrix)(0,0);
-        ySize = image_3d->t() * (*matrix)(1,1);
-        zSize = image_3d->r() * (*matrix)(2,2);
+        xSize = xSize * (*matrix)(0,0);
+        ySize = ySize * (*matrix)(1,1);
+        zSize = zSize * (*matrix)(2,2);
     }
-#else
 #endif
 
-
     osg::Vec4 minValue, maxValue;
     bool computeMinMax = false;
     for(Images::iterator itr = images.begin();
         itr != images.end();
         ++itr)
     {
+#if 0    
+        osg::RefMatrix* matrix = dynamic_cast<osg::RefMatrix*>((*itr)->getUserData());
+        if (matrix)
+        {
+            std::cout<<"matrix = "<<*matrix<<std::endl;
+        }
+#endif
         if (osgVolume::computeMinMax(itr->get(), minValue, maxValue)) computeMinMax = true;
     }
     
diff --git a/examples/osgvolume/volume_frag.cpp b/examples/osgvolume/volume_frag.cpp
index c8e0df2bd..ec4c98d82 100644
--- a/examples/osgvolume/volume_frag.cpp
+++ b/examples/osgvolume/volume_frag.cpp
@@ -59,7 +59,7 @@ char volume_frag[] = "uniform sampler3D baseTexture;\n"
                      "\n"
                      "    const float max_iteratrions = 2048.0;\n"
                      "    float num_iterations = ceil(length(te-t0)/sampleDensity);\n"
-                     "    if (num_iterations<2) num_iterations = 2.0;\n"
+                     "    if (num_iterations<2.0) num_iterations = 2.0;\n"
                      "\n"
                      "    if (num_iterations>max_iteratrions) \n"
                      "    {\n"
@@ -79,13 +79,21 @@ char volume_frag[] = "uniform sampler3D baseTexture;\n"
                      "            fragColor.xyz = fragColor.xyz*(1.0-r)+color.xyz*r;\n"
                      "            fragColor.w += r;\n"
                      "        }\n"
+                     "\n"
+                     "        if (fragColor.w<color.w)\n"
+                     "        {\n"
+                     "            fragColor = color;\n"
+                     "        }\n"
                      "        texcoord += deltaTexCoord; \n"
                      "\n"
                      "        --num_iterations;\n"
                      "    }\n"
                      "\n"
+                     "    fragColor.w *= transparency;\n"
+                     "\n"
                      "    if (fragColor.w>1.0) fragColor.w = 1.0; \n"
-                     "    if (fragColor.w==0.0) discard;\n"
+                     "    if (fragColor.w<alphaCutOff) discard;\n"
+                     "    \n"
                      "    gl_FragColor = fragColor;\n"
                      "}\n"
                      "\n";
diff --git a/examples/osgvolume/volume_tf_frag.cpp b/examples/osgvolume/volume_tf_frag.cpp
index 6a9e8b730..b0d0729d2 100644
--- a/examples/osgvolume/volume_tf_frag.cpp
+++ b/examples/osgvolume/volume_tf_frag.cpp
@@ -60,34 +60,43 @@ char volume_tf_frag[] = "uniform sampler3D baseTexture;\n"
                         "\n"
                         "    const float max_iteratrions = 2048.0;\n"
                         "    float num_iterations = ceil(length(te-t0)/sampleDensity);\n"
-                        "    if (num_iterations<2) num_iterations = 2.0;\n"
-                        "    \n"
+                        "    if (num_iterations<2.0) num_iterations = 2.0;\n"
+                        "\n"
                         "    if (num_iterations>max_iteratrions) \n"
                         "    {\n"
                         "        num_iterations = max_iteratrions;\n"
                         "    }\n"
                         "\n"
-                        "    vec3 deltaTexCoord=(te-t0)/float(num_iterations-1);\n"
+                        "    vec3 deltaTexCoord=(te-t0)/float(num_iterations-1.0);\n"
                         "    vec3 texcoord = t0;\n"
                         "\n"
                         "    vec4 fragColor = vec4(0.0, 0.0, 0.0, 0.0); \n"
                         "    while(num_iterations>0.0)\n"
                         "    {\n"
-                        "        float v = texture3D( baseTexture, texcoord).s;\n"
+                        "        float v = texture3D( baseTexture, texcoord).a;\n"
                         "        vec4 color = texture1D( tfTexture, v);\n"
+                        "\n"
                         "        float r = color[3]*transparency;\n"
                         "        if (r>alphaCutOff)\n"
                         "        {\n"
                         "            fragColor.xyz = fragColor.xyz*(1.0-r)+color.xyz*r;\n"
                         "            fragColor.w += r;\n"
                         "        }\n"
+                        "\n"
+                        "        if (fragColor.w<color.w)\n"
+                        "        {\n"
+                        "            fragColor = color;\n"
+                        "        }\n"
                         "        texcoord += deltaTexCoord; \n"
                         "\n"
                         "        --num_iterations;\n"
                         "    }\n"
                         "\n"
+                        "    fragColor.w *= transparency;\n"
+                        "\n"
                         "    if (fragColor.w>1.0) fragColor.w = 1.0; \n"
-                        "    if (fragColor.w==0.0) discard;\n"
+                        "    if (fragColor.w<alphaCutOff) discard;\n"
+                        "    \n"
                         "    gl_FragColor = fragColor;\n"
                         "}\n"
                         "\n";
diff --git a/examples/osgvolume/volume_tf_iso_frag.cpp b/examples/osgvolume/volume_tf_iso_frag.cpp
index 725726156..f2d652a32 100644
--- a/examples/osgvolume/volume_tf_iso_frag.cpp
+++ b/examples/osgvolume/volume_tf_iso_frag.cpp
@@ -106,16 +106,9 @@ char volume_tf_iso_frag[] = "uniform sampler3D baseTexture;\n"
                             "\n"
                             "            float lightScale = 0.1 +  abs(dot(normal.xyz, eyeDirection));\n"
                             "            \n"
-                            "            \n"
-                            "#if 0\n"
                             "            color.x *= lightScale;\n"
                             "            color.y *= lightScale;\n"
                             "            color.z *= lightScale;\n"
-                            "#else\n"
-                            "            color.x = lightScale;\n"
-                            "            color.y = lightScale;\n"
-                            "            color.z = lightScale;\n"
-                            "#endif\n"
                             "\n"
                             "            fragColor = color;\n"
                             "            \n"