J-S, Your view of how the system would work is probably very similar to what I had in mind. The idea is that camera manipulators really define business logic behavior and should be used as such. For example, these are some possible API examples (not exhaustive)
FlightManipulator: //these do not set pitch or roll angles, these accept magnitudes between, //lets say, [-1,1] and then the implementation decides how strongly that //"pushes" the pitch angle or roll angle. pitch(force) roll(force) throttle(force) etc.. FirstPersonManipulator: lookHor(speed) lookVert(speed) walk(speed) etc... ModelManipulator (my new name for a TrackballManipulator): zoom(amount) rotate(angle) etc... Then there would be separate GUIEventAdapters which are just GUI Event Handlers, and these handlers map their specific input to calls to the manipulator. Hence, when the joystick handler receives a joystick event, the handler figures out what was pressed or pushed, then requests a business logic action from the FlightManipulator, or the FirstPersonManipulator, or the ModelManipulator...depending on which manipulator is currently in use. That sound good? I think the fundamental issue is that someone decided to combine the concept of a GUI Event Handler and the concept of a Camera Manipulator....the reason this is a problem is because, as stated before, a Camera Manipulator is all business logic - it deals only with 3D concepts. The GUI Event Handler on the other hand is sitting in the architecture layer where it knows things about IO (and therefore hardware). Hence we've crossed abstraction layers and now its limiting extensions of the system. What do you think? Also, J-S, I didn't really understand the point you were trying to make in your final paragraph: > > I would suggest that axes be mappable to either an analog axis (say > mouse up/down or joystick y axis) or a pair of buttons (one for > incrementing and one for decrementing the value). > Thanks. Matt[/quote] ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=32586#32586 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
