Hi Nicolas, It's difficult for others to advice you without seeing code that may or may not be wrong, or what you need to learn - so we can't really provide specific answers.
The best I can do is provide general answer. There are several CameraManipular implementations in OpenSceneGraph/src/osgGA so having a look at these would be advisable. Secondly online resources that teach matrix maths would also be a place to start. Robert.
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