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();
> }
>
>
>
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