Hi all,
I am hitting my head against a brick wall with this one. I am trying
to use osgManipulators to edit nodes in my scene. I attach a node to
a manipulator, rotate it, and then detach the node from the
manipulator and apply the manipulator's MatrixTransform to the node's
PositionAttitudeTransform (all nodes that I manipulate have a PAT as
root) so that the PAT affects its children in the same way that the
osgManipulator affected its children. Here is the code snippet:
NodeUpdateCallback that updates node with osgManipulator's MatrixTransform:
virtual void operator() ( osg::Node* node, osg::NodeVisitor* nv )
{
osgManipulator::Selection * pSelection = dynamic_cast<
osgManipulator::Selection * > ( node );
if ( pSelection && m_Manip->m_PrevMatrix !=
m_Manip->m_Dragger->getMatrix() )
{
// Apply the transform
for ( int i = 0; i < m_Manip->m_SelectionCache->getNumChildren(); ++i )
{
osg::PositionAttitudeTransform * pElem = dynamic_cast<
osg::PositionAttitudeTransform * > ( pSelection ->getChild(i) );
VOSGSceneElement * pElemCache = dynamic_cast< VOSGSceneElement
* > ( m_Manip->m_SelectionCache->getChild(i) );
osg::Matrix ManipMatrix = pSelection->getMatrix();
ManipMatrix.preMult(osg::Matrix::translate( -pElem->getPivotPoint() )*
osg::Matrix::scale( pElem->getScale() )*
osg::Matrix::rotate( pElem->getAttitude() )*
osg::Matrix::translate( pElem->getPosition() ) );
pElemCache->setPosition( ManipMatrix.getTrans() );
pElemCache->setAttitude( ManipMatrix.getRotate() );
pElemCache->setScale( ManipMatrix.getScale() );
}
m_Manip->m_PrevMatrix = m_Manip->m_Dragger->getMatrix();
}
}
In this example a VOSGSceneElement is the node that I'm trying to
manipulate and is derived from PositionAttitudeTransform. pSelection
contains a copy of this. The copy in pSelection is transformed
correctly by the manipulator. In this update callback, I'm trying to
apply the same transform from pSelection to the VOSGSceneElement in
the scene graph.
Unfortunately this doesn't work properly, and I'm having difficulty
figuring out how to apply the correct transformation. I would be very
grateful if anybody can point me in the right direction..How do I
apply a MatrixTransform to a PositionAttitudeTransform?
As always, thank you!
Morne
_______________________________________________
osg-users mailing list
[email protected]
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
