Modified osgGA::TrackballManipulator so that osgGA::GUIEventAdapter::SCROLL performs a zoom. Arbitrarily zooms 10% in/out for each click, only tested on Windows (sorry)
Corss-posted from same version posted in General ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=7559#7559
TrackballManipulator.cpp
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