I had a try at doing this through TrackBallManipulator This seems to work, tested on Windows with viewerQT and viewer.Each mouseWheel click zooms in/out by 10%
I'm not an expert and would welcome any suggestions about better ways to do this. ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=7522#7522
TrackballManipulator.cpp
Description: Binary data
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