struct UnionOps
{
static BoundingBox<T, D> combine_aabb(const BoundingBox<T, D> &a, const BoundingBox<T, D> &b) { return a|b; }
struct UnionOps
{
static BoundingBox<T, D> combine_aabb(const BoundingBox<T, D> &a, const BoundingBox<T, D> &b) { return a|b; }