Hi Marlin,
you need to get the appropriate parent-node paths:
osg::NodePathList parent_node_list = mat.getParentalNodePaths();
Now if you know the path you want to retrieve, you can call
e.g.:
node_path = parent_node_list[1];
osg::Matrix mat = osg::computeLocalToWorld(node_path);
Also the getParentalNodePaths() function lets you specify the node in
the parent path where to stop traversal (e.g. to get transformations in
a local model reference-frame)
The reason is, that the scene-graph is a DAG where nodes can have
multiple parents.
Another possibility is to use the per-instance transform inside an
update callback:
void MyUpdateCallback::operator()( osg::Node* node, osg::NodeVisitor* nv)
{
osg::NodePath& node_path = nv->getNodePath() ;
osg::Matrix mat = osg::computeLocalToWorld(node_path);
///...
traverse(node,nv);
}
Cheers
Sebastian
Am 07.05.2018 um 20:58 schrieb Rowley, Marlin R:
Hello,
I’m trying to figure out how to retrieve the combined matrix from a node
that is of a PositionAttitudeTransform node type. I can get it
converted to a Transform() class, but there is no clear way of getting
the combined matrix from local to world. For example,
Osg::PositionAttitudeTransform trans;
Trans.setScale(2,2,2);
Trans.setPosition(0,10,0);
Osg::Matrixd temp = getCombinedTransform(trans);
Osg::Matrixd getCombinedTransform(const osg::ref_ptr<osg::Node> & mat)
{
Auto m = mat->asTransform();
Return m->computeLocalToWorldMatrix (m, ???); << ======
why use a node visitor on yourself?
Or
Return m->getCombinedMatrix()?? << ===== is there such a
thing?
}
----------------------------------------
Marlin Rowley
Software Engineer, Staff
cid:[email protected]
/Missiles and Fire Control/
972-603-1931 (office)
214-926-0622 (mobile)
[email protected] <mailto:[email protected]>
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