Hi Pawan,
The OSG has view frustum culling built into it so you should need to
add anything extra. You can also just configure the viewer's Camera
so that their view frustum all just map to the various
projector/monitors.
Robert.
On Jan 11, 2008 10:11 AM, Pawan Harish <[EMAIL PROTECTED]> wrote:
> Hi Robert,
> Thanks for the quick reply. Actually I am trying to cull the
> scene based on some planes as a part of a display wall system I'm building
> over OSG, for this I need the bounding sphere at the current transformed
> position. I can transform the center of the sphere with all the matrices
> upto the root, but transforming the radius is a bit hard. Is there any
> other way to get the transformed sphere to this end.
>
> Pawan
>
>
> On Fri, 11 Jan 2008, Robert Osfield wrote:
>
> > Hi Pawan,
> >
> > A node's local bounding sphere encompasses the subgraph below the
> > node, and in the coordinate frame of the subgraph below the node, it's
> > not at all affected by what happens above it in the scene graph. The
> > basic feature of scene graphs.
> >
> > Could you explain what you are wanting to do at a higher level, there
> > is almost certainly a more nature way to do it.
> >
> > Robert.
> >
> > On Jan 11, 2008 9:40 AM, Pawan Harish <[EMAIL PROTECTED]> wrote:
> >> Hi,
> >> I am trying to get the bounding sphere at a node but the return value is
> >> the same as the initial bounding sphere although I've transformed the Node
> >> using a MatrixTransform. Here is the code I'm using, could anyone please
> >> tell me how to get the transformed bounding sphere. Thanks in advance.
> >>
> >> Pawan Harish
> >>
> >> int main(int argc, char **argv)
> >> {
> >> osgViewer::Viewer viewer;
> >> osg::Group *group = new osg::Group;
> >> osg::MatrixTransform *mat1 = new osg::MatrixTransform;
> >> osg::MatrixTransform *mat2 = new osg::MatrixTransform;
> >>
> >> mat1->setMatrix(osg::Matrix::translate(-50,0,0)*osg::Matrix::scale(0.2,0.2,0.2));
> >>
> >> mat2->setMatrix(osg::Matrix::translate(-25,0,30)*osg::Matrix::scale(0.2,0.2,0.2));
> >> osg::Node* glider = osgDB::readNodeFile("glider.osg");
> >>
> >> osg::Node* cow = osgDB::readNodeFile("cow.osg");
> >>
> >> osg::Vec3 center_orig = cow->getBound().center();
> >> double radius_orig = cow->getBound().radius();
> >> printf("center_orig: %lf %lf %lf radius_orig: %lf\n",
> >> center_orig[0],center_orig[1],center_orig[2],radius_orig);
> >>
> >> osg::Node* cessna = osgDB::readNodeFile("cessna.osg");
> >> glider->setName("Glider");
> >> cessna->setName("Cessna");
> >> cow->setName("Cow");
> >> mat1->setName("Matrix1_Cow");
> >> mat2->setName("Matrix2_Cessna");
> >> group->addChild(glider);
> >> mat1->addChild(cow);
> >> mat2->addChild(cessna);
> >> group->addChild(mat1);
> >> group->addChild(mat2);
> >> group->setName("PawansExpt");
> >> viewer.setSceneData(group);
> >>
> >> osg::BoundingSphere bs = cow->getBound();
> >>
> >> //These values are same as the ones printed above
> >>
> >> osg::Vec3 center_new = bs.center();
> >> double radius_new = bs.radius();
> >> printf("center_new: %lf %lf %lf radius_new: %lf\n",
> >> center_new[0],center_new[1],center_new[2],radius_new);
> >>
> >> return viewer.run();
> >> }
> >>
> >>
> >>
> >> _______________________________________________
> >> 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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