I think you need to use PositionAttitudeTransform (OSGQSG.pdf page 49) but there's a big chance that I misunderstand the case.
2008/6/10 Julian Looser <[EMAIL PROTECTED]>: > Hi Guy, > > Thanks for your response. I think we are thinking of different > manipulators. I'm talking about the classes in the osgManipulator namespace. > Were you referring to camera manipulators like the trackball? osgManipulator > already provides GUI objects for doing the transformations (just run the > osgManipulator example). > > That part works OK - I can click and drag the little widgets to manipulate > the model. However, I also want to be able to specify the manipulation > directly. For example, I could drag the widgets around to scale the model to > 0.5, but I also want to be able to type in 0.5 in my interface and get the > same result. Problem is that seems to put the widgets out of sync with the > model. :-( > > I haven't looked at osgWidget. Perhaps it does what I need... > > Julian. > > > Guy wrote: > >> Hello Julian, >> What EXACTLY are you trying to achieve? >> Do you need some objects (GUI objects if I understand correctly) to have >> their own transformations without being affected by the Manipulator? >> If so, you can use set the transformation to ABSOLUTE_RF. >> transform->setReferenceFrame(osg::Transform::ABSOLUTE_RF); >> >> You can also use billboards so their position will change with the >> manipulator transformation, but they will always direct towards the >> observer. >> >> And of course, you might want to check osgWidget that supply GUI tools >> for osg scenes, (And if I'm wrong with the description I apologies). >> >> Good luck, >> Guy. >> >> -----Original Message----- >> From: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] On Behalf Of Julian >> Looser >> Sent: Monday, June 09, 2008 5:04 AM >> To: OpenSceneGraph Users >> Subject: [osg-users] Manually setting osgManipulator transformations >> >> Hi, >> >> I posted a question a while ago about osgManipulator, but didn't get any >> >> replies. My problem is that I want to be able to set the transformation >> matrix directly on a selected object, in addition to using the various >> osgManipulator widgets. That is, setting the matrix in code should update >> the widgets, and interacting with the widgets should update the matrix. From >> what I can tell, it's currently only possible to generate the transformation >> matrix with osgManipulator - you can't modify the transformation matrix and >> see that change reflected back in the widgets. >> >> I would be surprised if nobody has run into this problem before. It seems >> like required functionality for many applications where the widgets in >> osgManipulator would be most helpful. In my case, I'm trying to recreate a >> rudimentary 3D editor and the ability to type specific translation and >> rotation values into the GUI is just as important as being able to directly >> drag the handles on the manipulator widgets. >> >> I've reached the conclusion that I can't do this with osgManipulator so >> I'm considering reimplementing something to suit my needs. I'd really >> appreciate it if someone could tell me: >> >> a) that I'm wrong and osgManipulator *can* do this (would be great!) >> b) is anybody working on osgManipulator who I could collaborate with on >> adding what I need? >> c) would it be easier/cleaner/faster to simply start from scratch? >> >> I only propose (c) because it looks to me like osgManipulator is designed >> as a sort of message-passing system that incrementally modifies >> >> a transformation matrix. Trying to make that process work backwards sounds >> tricky, and making it so you can seamlessly jump between manual (typing) and >> direct (click and drag) editing modes sounds even harder. >> >> As always, thanks for listening. :-) >> >> Cheers, >> Julian. >> _______________________________________________ >> osg-users mailing list >> osg-users@lists.openscenegraph.org >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or >> g >> _______________________________________________ >> osg-users mailing list >> osg-users@lists.openscenegraph.org >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> >> > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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