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();
>> }
>>
>>
>>
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>>
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