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
