Hi Robert et al. Let me explain what I want to do accomplish an example:
I load a model with no camera manipulator. I know the camera parameters (eye, ctr, up) that yield a desired pose. I set the viewer camera with those parameters and obtain the desired pose. Now I want to assume that I don't know those parameters. A user loads a model with a trackball manipulator. He / she can manipulate the model until the desired pose is obtained and recuperate the camera parameters (eye, ctr, up), which should be what I used in the previous step... Is that more clear ? How would I achieve this ? regards, Bill -----Original Message----- From: [EMAIL PROTECTED] on behalf of Robert Osfield Sent: Tue 9/18/2007 11:28 AM To: OpenSceneGraph Users Subject: Re: [osg-users] Trackball and view question Hi Bill, The camera manipulators role is to modifying the view matrix so I'm a bit perplexed that you are suprised by this. Also please considering move from SimpleViewer up to osgViewer::Viewer working as an embedded viewer in 2.x rather than using SimpleViewer as it only existed for a short while and has been totally superseded. Robert. On 9/18/07, Poirier, Guillaume <[EMAIL PROTECTED]> wrote: > > > > > Hello everyone, > > I am using a SimpleViewer. I set up a post draw callback on its main > camera. In it > I read the camera eye, center, and up vectors. Initially, this give me (0, > 0, 0), > (0, 0, -1), and (0, 1, 0) respectively. This is what I expect and it gives > me a > particular view of my scene. > > Now I add a trackball manipulator to the main camera and set up the view > similar > to what I had previously. When I read back the data it is quite different. > I would have > expected the same camera position / orientation than before since what I > see is > similar. Unless the trackball affects the model position / orientation and > not just > the view ? How can I use a trackball and read back in the post draw > callback the > values I want ? > > > sincerely, > > > Bill > _______________________________________________ > 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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