Posted by gouessej on Jan 15, 2014; 2:02pm
URL: https://forum.jogamp.org/MouseListener-mouseWheelMoved-and-Shift-tp4031233p4031236.html

If you press Shift, the operating system treats your scroll as an horizontal one, not a vertical one. Please look at the documentation:
http://jogamp.org/deployment/jogamp-next/javadoc/jogl/javadoc/com/jogamp/newt/event/MouseEvent.html#getRotation()