void appendLineStrip(osg::Vec3Array* src) {
int size = _array->size();
_array->insert(_array->end(), src->begin(), src->end());
_geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::LINE_STRIP, size, src->size()));
}
void appendPoint(const osg::Vec3& p) {
int size = _array->size();
_array->push_back(p);
_geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::POINTS, size, 1));
}
void postProcess() {
_geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::TRIANGLES, _array->size()-_count, _count));
_count = 0;
}