void
FltExportVisitor::apply( osg::MatrixTransform& node )
{
// Importer reads a Matrix record and inserts a MatrixTransform above
// the current node. We need to do the opposite: Write a Matrix record
// as an ancillary record for each child. We do that by storing the
// MatrixTransform in each child's UserData. Each child then checks
// UserData and writes a Matrix record if UserData is a MatrixTransform.
_firstNode = false;
ScopedStatePushPop guard( this, node.getStateSet() );
osg::ref_ptr< osg::RefMatrix > m = new osg::RefMatrix;
m->set( node.getMatrix() );
if (node.getUserData())
{
const osg::RefMatrix* rm = dynamic_cast<const osg::RefMatrix*>( node.getUserData() );
if (rm)
(*m) *= *rm;
}
typedef std::vector< osg::ref_ptr< osg::Referenced > > UserDataList;
UserDataList saveUserDataList( node.getNumChildren() );
unsigned int idx;
for( idx=0; idx<node.getNumChildren(); ++idx )
{
saveUserDataList[ idx ] = node.getChild( idx )->getUserData();
node.getChild( idx )->setUserData( m.get() );
}
traverse( (osg::Node&)node );
// Restore saved UserData.
for( idx=0; idx< node.getNumChildren(); ++idx )
{
node.getChild( idx )->setUserData( saveUserDataList[ idx ].get() );
}
}
