from G4Calo import GeometryDescriptor, G4System
import sys

cw = GeometryDescriptor()


for _ in range(25):
    cw.addLayer(0.5, "G4_Pb", False)
    cw.addLayer(1.,"G4_POLYSTYRENE",True,1)

#directly use G4System as a global singleton
G4System.init(cw)


df = G4System.run_batch(10, 'gamma', 1)
cw = GeometryDescriptor()

for _ in range(5):
    cw.addLayer(0.5, "G4_Pb", False)
    cw.addLayer(1.,"G4_POLYSTYRENE",True,1)

G4System.init(cw)
df = G4System.run_batch(10, 'gamma', 1)