Found this recent thread on changing the camera position:
http://article.gmane.org/gmane.comp.graphics.openscenegraph.user/15567/match=change+camera+position
The solution mentionned goes like this:
-----------------------------------
From: Matteo Campana
Subject: Re: Change camera position
Newsgroups: gmane.comp.graphics.openscenegraph.user
Date: 2007-06-21 13:50:19 GMT (9 weeks, 4 days, 19 hours and 6 minutes ago)
Thank you for reply
..now I can change the position of the camera.
I write here how I change the position
hope it can help:
ChangePosition (osg::Node *node){
const osg::BoundingSphere& boundingSphere= node->getBound();
osg::Matrix myviewMatrix;
osg::Vec3 eye = boundingSphere._center+osg::Vec3( 0.0f,-3.5f *
boundingSphere._radius, 0.0f);
osg::Vec3 center = boundingSphere._center;
osg::Vec3 up = osg::Vec3(0.0f,0.0f,1.0f);
myviewMatrix.makeLookAt(eye,center,up);
this->GetViewer()->setView(myviewMatrix);
}
Thanks!!!
Matteo
-----------------------------------
Needless to say, it didn't work either...For starter, there's no such thing as
osg::Viewer::setView(). I can't be the first person wanting to reset the camera
manipulators after loading a file...
- Nick -
>
>
> OK,
>
> I've tried redefining the manipulator directly and I tried with the main
> camera. Both methods fail to actually update the trackball's center & radius.
>
> Ex:
>
> m_rpMainCamera->setViewMatrixAsLookAt( vnew_eye, vnew_center, vnew_up );
>
> or...
>
> m_rpTerrainManipulator->setHomePosition( vnew_eye,v new_center, vnew_up );
>
> What's the recommended way to do this?
>
> Thanks,
>
> - Nick -
>
> >
> > How can I make sure an object fits inside a camera view after loading a new
> > scene. All the examples load scenes and Viewer/Camera at startup. I want to
> > add nodes to an existing scene; not create a new one.
> > My OSG tree looks like this:
> > + File 1
> > |
> > + Scene ----+ File 2
> > | |
> > | + File ...
> > Root ----+
> > |
> > + Grid
> > |
> > + Axis
> > |
> > + HUD Camera
> > (Both Root and Scene are Switch groups, so I can selectively show/hide
> > their children)
> > The problem is that whenever I load a new file/node, it doesn't always show
> > up on screen. My guess is that some objects are outside the view volume. I
> > could write a simple function to update Scene's bounds and make sure they
> > fall within the fustrum, but I'm sure there's an existing method to do
> > this...
> > - Nick -
>
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