Merged fixes to osgVolume's handling of ImageSequence animated volumes, merge command:

svn merge -r 9746:9747 http://www.openscenegraph.org/svn/osg/OpenSceneGraph/branches/OpenSceneGraph-2.8

src/osgVolume/Layer.cpp

@@ -14,6 +14,7 @@
 #include <osgVolume/Layer>
 
 #include <osg/ImageUtils>
+#include <osg/ImageStream>
 #include <osg/Endian>
 #include <osg/Notify>
 #include <osg/io_utils>
@@ -166,6 +167,16 @@ void ImageLayer::translateMinToZero()
     }
 }
 
+bool ImageLayer::requiresUpdateTraversal() const
+{
+    return dynamic_cast<osg::ImageStream*>(_image.get())!=0;
+}
+
+void ImageLayer::update(osg::NodeVisitor& nv)
+{
+    if (_image.valid()) _image->update(&nv);
+}
+
 /////////////////////////////////////////////////////////////////////////////
 //
 // CompositeLayer
@@ -185,6 +196,30 @@ void CompositeLayer::clear()
     _layers.clear();
 }
 
+bool CompositeLayer::requiresUpdateTraversal() const
+{
+    for(Layers::const_iterator itr = _layers.begin();
+        itr != _layers.end();
+        ++itr)
+    {
+        if (itr->layer->requiresUpdateTraversal()) return true;
+    }
+    
+    return false;
+}
+
+void CompositeLayer::update(osg::NodeVisitor& nv)
+{
+    for(Layers::const_iterator itr = _layers.begin();
+        itr != _layers.end();
+        ++itr)
+    {
+        itr->layer->update(nv);
+    }
+    
+}
+
+
 /////////////////////////////////////////////////////////////////////////////
 //
 // createNormalMapTexture

src/osgVolume/VolumeTile.cpp

@@ -49,6 +49,8 @@ VolumeTile::VolumeTile():
     _hasBeenTraversal(false)
 {
     setThreadSafeRefUnref(true);
+
+    setNumChildrenRequiringUpdateTraversal(1);
 }
 
 VolumeTile::VolumeTile(const VolumeTile& volumeTile,const osg::CopyOp& copyop):
@@ -58,6 +60,8 @@ VolumeTile::VolumeTile(const VolumeTile& volumeTile,const osg::CopyOp& copyop):
     _hasBeenTraversal(false),
     _layer(volumeTile._layer)
 {
+    setNumChildrenRequiringUpdateTraversal(getNumChildrenRequiringUpdateTraversal()+1);            
+
     if (volumeTile.getVolumeTechnique())
     {
         setVolumeTechnique(osg::clone(volumeTile.getVolumeTechnique()));
@@ -117,6 +121,12 @@ void VolumeTile::traverse(osg::NodeVisitor& nv)
             
         _hasBeenTraversal = true;
     }
+    
+    if (nv.getVisitorType()==osg::NodeVisitor::UPDATE_VISITOR &&
+        _layer->requiresUpdateTraversal())
+    {
+        _layer->update(nv);
+    }
 
     if (_volumeTechnique.valid())
     {
@@ -138,6 +148,11 @@ void VolumeTile::init()
     }    
 }
 
+void VolumeTile::setLayer(Layer* layer)
+{
+    _layer = layer;
+}
+
 void VolumeTile::setVolumeTechnique(VolumeTechnique* volumeTechnique)
 {
     if (_volumeTechnique == volumeTechnique) return;