The GeodeticGraticule renders a conflict when adding a oblique model using the TerrainGeneNode.

 GeodeticGraticule* graticule = new GeodeticGraticule();
 mapNode->getMap()->addLayer(graticule);

osgEarth::TerrainEngineNode* p = mapNode->getTerrainEngine();
osgEarth::GeoTransform* pGeo = new osgEarth::GeoTransform();
pGeo->addChild()//add oblique photography Node from file
p->addChild(pGeo);

I don't know what you are doing, but I do know you should not add children to the terrain engine.

thank you for your reminder