Hi Robert, thanks for that, very useful information indeed. Ok since I'm working off 2.8.0 Windows binaries, what I will do is grab the osgManipulator source/include and example files from svn/trunk and compile those separately in my app.
(This one right? http://www.openscenegraph.org/svn/osg/OpenSceneGraph/trunk ) Cheers, Andrew On Fri, Sep 25, 2009 at 2:15 PM, Robert Osfield <[email protected]>wrote: > Hi Andrew, > > In the svn/trunk version of the OSG I have refactored osgManipulator a > bit to make it more flexible and easier to use. I would strongly > suggest having a look at it as the extra complexity of CommandManager > is no longer needed, also you no longer need to implement your own > event handling, as osgManipulator can now automatically pick up on > events. There is also a new callback support that allows you to move > objects around in the scene to follow manipulators. > > Robert. > > On Fri, Sep 25, 2009 at 1:58 PM, Andrew Thompson <[email protected]> > wrote: > > Hi there, > > > > I am developing a CAD-Style application and am interested in using > osgManipulator to provide picking, moving, rotating and scaling of objects. > I just have a couple of questions with regard to the use of manipulators, > and hope some of you can take the time to answer them for me. > > > > Firstly my application currently has a relatively flat scenegraph, where > each "Object" in the CAD app is arranged as follows: > > > > > > Code: > > > > PositionAttitudeTransform > > | > > Geode > > | > > Geometry > > > > > > > > > > Then I have N "Objects" arranged as above in the scene that are a child > of the root scene node (so a flat scene graph). > > > > >From my understanding from reading the osgManipulator example, to > manipulate an object I can use the following hierarchy: > > > > [Image: > http://i137.photobucket.com/albums/q217/andyb1979/manpulatorhierachy.png ] > > > > In this diagram Geode is the object I want to manipulate, so I would > replace that with the PAT from my "3D Object" implementation, Selection > wraps the object to manipulate, Dragger can go anywhere in the scene and the > CommandManager links the Dragger to the Selection. > > > > So -- some questions on how I may use this in my app: > > > > * Firstly, to select an object, I pick it. At this point should I create > a Selection and place in-between my 3D object and SceneRoot? Or can > selection be anywhere and just place the object as a child of that? > > > > * Secondly can the dragger be anywhere in the scene hierachy or must it > be a parent of the selection? > > > > * Similarly, does the Selection have to be specifically put between my 3D > object and the scene root (In a CAD-Style app I will be > selecting/deselecting objects quite regularly) > > > > * Say my object has a transform applied to it by its > > PositionAttitudeTransform. I need to somehow get that transform, apply to > the dragger, then let the user manipulate it and apply the resultant > transform to the PAT, removing the dragger/selection from the scene. Any > ideas how this could work? > > > > * Is there a way to get an event or call-back out for each translate, > rotate, scale operation as I need to push these into an undo-redo stack > > > > * Finally, could the above be modified to work with multiple objects in > the same selection and how would I apply the Dragger transform to all of > them before/after the event? > > > > > > > > Thanks for your time, any insights would be gratefully received. > > > > Andrew[/list] > > > > ------------------ > > Read this topic online here: > > http://forum.openscenegraph.org/viewtopic.php?p=17650#17650 > > > > > > > > > > > > _______________________________________________ > > osg-users mailing list > > [email protected] > > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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