[osg-users] How to set new PAT position for every traversal run ?

[Sanat Talmaki]

Hi,

I am trying to set new values for the position of my PAT node for every run of 
while(!viewer.done())


Code:
while( !viewer.done() )
{
  osg::Vec3d positionVector;
  // fire off the cull and draw traversals of the scene.
  viewer.frame();          
  viewer.updateTraversal();
  receiveSignal(gpsInstance, gpsLat, gpsLon);
  setBackhoe(gpsLat, gpsLon, mapNode, surface, objectPlacer,   backhoe1PAT);
  return 0;
}



And in my function:


Code:
void setBackhoe(double gpsLat, 
                double gpsLon, 
                osgEarth::MapNode* mapNode,
                osg::Node *surface,                
                osgEarthUtil::ObjectPlacer* objectPlacer, 
                osg::PositionAttitudeTransform* backhoe1PAT
                //osg::Vec3d &positionVector
                ) 
{
  osg::Matrixd positionMatrix1; 
        objectPlacer->createPlacerMatrix(gpsLat, gpsLon, 131, positionMatrix1);
        static double latitude;
        static double longitude;
        static double height;
        //static double x, y;
        static double X1 = positionMatrix1.getTrans().x();
        static double Y1 = positionMatrix1.getTrans().y();
  static double Z1 = positionMatrix1.getTrans().z();
        //get SpatialReferenceSystem SRS for terrain (i.e. map) and lat-long.
        const SpatialReference* terrain_srs = 
mapNode->getMap()->getProfile()->getSRS();
        const SpatialReference* latlong_srs = terrain_srs->getGeographicSRS();
        //convert from projected to lat-long:
        terrain_srs->transform(X1, Y1, latlong_srs, longitude, latitude ); 
        //to go from lat-long to projected:
        latlong_srs->transform(longitude, latitude, terrain_srs, X1, Y1);
        //set backhoe 1 exactly over terrain: letting the callback do that work.
        //set the PAT value of backhoe1:
        backhoe1PAT->setPosition(osg::Vec3d(X1, Y1, 0.0));
        return ;
}



The problem I'm having is the my PAT node resets to (0,0,0) as soon as the 
function is exited. But since I was passing in by pointer a PAT node which I 
created in my main(), I thought this would not happen. 

How can I keep the current position value in my PAT node till it is updated in 
the next run ?

Been stuck on this for quite a while so was hoping to get some advise.

Thanks.

Best,

Sanat

------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=30176#30176





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