[Question] Intersection of two spheres

[markmirt]

I am using pygalmesh '0.10.6' and helpers '0.2.0'

I would like to check if two spheres collided. (Similar to test_balls_intersection() in /tests/test_volume_mesh.py/)

spheremesh1 = pygalmesh.Ball([1, 1, 1], .5)
spheremesh2 = pygalmesh.Ball([1.1, 1, 1], .5)
u = pygalmesh.Intersection([spheremesh1,spheremesh2])
mesh = pygalmesh.generate_mesh(u, max_cell_circumradius=1.0e-2, verbose=False)
vol = sum(helpers.compute_volumes(mesh.points, mesh.cells["tetra"]))
I get this error: AttributeError: module 'helpers' has no attribute 'compute_volumes'.

Is "helpers" from "pip install helpers" correct?

Is there an easier way to check if spheremesh1 and spheremesh2 intersected? (it can be at one point or multiple points)