Added hull="hul-filename" property support to <volume> tag that can used thus:

<layer>
            <volume renderer="MultiPass" hull="cow.osgt.0,-2,-4.trans.50,50,50.scale">CardiacCT</volume>
        </layer>

include/osgPresentation/deprecated/SlideShowConstructor

@@ -328,6 +328,7 @@ public:
         osg::ColorSpaceOperation                colorSpaceOperation;
         osg::Vec4                               colorModulate;
         Technique                               technique;
+        std::string                             hull;
     };