simgear::BVHNode::Id& id);
bool get_agl_ft(double t, const double pt[3], double max_altoff,
double contact[3], double normal[3], double linearVel[3],
simgear::BVHNode::Id& id);
bool get_agl_ft(double t, const double pt[3], double max_altoff,
double contact[3], double normal[3], double linearVel[3],