Hi thanks fot the advice, it worked.
Here is how I implemented getting the modeview matrix for a specific node.
I include it for future reference for users searching this list.
class CullCallback : public osg::NodeCallback
{
virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
{
osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(nv);
if (cv)
{
std::cout<<"CULLVISITOR callback -
ModelviewMatrix"<<node<<std::endl;
osg::Matrix mat = *(cv->getModelViewMatrix());
for (int i = 0; i < 4; i++)
{
printf ("\t");
for (int j = 0; j < 4; j++)
printf ("%8.3f ", mat (i, j));
printf ("\n");
}
}
traverse(node,nv);
}
};
Then in the creation of the scenegraph you attach the Callback to the desired
node
node->setCullCallback (new CullCallback);
Dimi
----- Original Message ----
From: Robert Osfield <[email protected]>
To: OpenSceneGraph Users <[email protected]>
Sent: Wednesday, May 20, 2009 11:20:33 AM
Subject: Re: [osg-users] Extracting modelview matrix from main loop
On Wed, May 20, 2009 at 9:07 AM, dimi christop <[email protected]> wrote:
> thanks for the reply.
> I have implemented all sorts of particle functionality (tris, lines, quads)
> already therefore
> I prefer to port the code (if possible) initially as is and enhence it
> further after that.
> Any idea how to get the modelview matrix?
>From the CullVisitor you just do cullvistor->getModelViewMatrix()
which passes back a pointer to a RefMatrix (which is just a Matrix
with reference counting.)
You can get the CullVisitor by dynmaically casting the NodeVistor
passed in to the Node::traverse() method or the node callback. Have
a search through OSG sources to see example of this being done.
Robert.
_______________________________________________
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
