import gmsh
import sys
import math

gmsh.initialize(sys.argv)
gmsh.model.add("sphere_cut")
R = 1
R1 = 0.95
sph = gmsh.model.occ.addSphere(0, 0, 0, R, -1, 0, math.pi / 2, math.pi / 2)
b1 = gmsh.model.occ.addBox(R1, 0, 0, R, R, R)
b2 = gmsh.model.occ.addBox(0, R1, 0, R, R, R)
b3 = gmsh.model.occ.addBox(0, 0, R1, R, R, R)
gmsh.model.occ.cut([(3, sph)], [(3, b1), (3, b2), (3, b3)])
gmsh.model.occ.synchronize()

gmsh.model.removeEntities([(3, sph)])
gmsh.model.removeEntities([(2, 2), (2, 4), (2, 6)], True)
if '-nopopup' not in sys.argv:
    gmsh.fltk.run()
gmsh.finalize()