bug fix for QOGLViewer pivot point update
bug fix for QOGLViewer pivot point update

cgogn/CGoGN_2,untereiner/CGoGN_2,etienneschmitt/CGoGN_2,david-cazier/CGoGN_2,david-cazier/CGoGN_2,cgogn/CGoGN_2,untereiner/CGoGN_2