code: def bounding_box(self):
          
          from . import primitives
  
          transform = np.eye(4)
          # translate to center of axis aligned bounds
          transform[:3, 3] = self.bounds.mean(axis=0)
  
          aabb = primitives.Box(transform=transform,
                                extents=self.extents,
                                mutable=False)
          return aabb
docs: An axis aligned bounding box for the current mesh.
  
          Returns
          ----------
          aabb : trimesh.primitives.Box
            Box object with transform and extents defined
            representing the axis aligned bounding box of the mesh