Why Number of filters: 0?

[jizhang02]

Hello,

When I test the code below, I printed out the Filters, but the result is 0, I don't understand because there should be some filter info.

# filter on iec phantom
import opengate as gate
import opengate.contrib.phantoms.nemaiec as gate_iec
from opengate.userhooks import check_production_cuts

# create the simulation
sim = gate.Simulation()

# main options
sim.g4_verbose = False
sim.g4_verbose_level = 1
sim.visu = True
sim.random_seed = 12332567

# units
m = gate.g4_units.m
cm = gate.g4_units.cm
keV = gate.g4_units.keV
MeV = gate.g4_units.MeV
Bq = gate.g4_units.Bq
nm = gate.g4_units.nm
mm = gate.g4_units.mm

#  change world size
sim.world.size = [1 * m, 1 * m, 1 * m]

# iec phantom
iec_phantom = gate_iec.add_iec_phantom(sim)

# default source for tests
source = sim.add_source("GenericSource", "mysource")
source.energy.mono = 1 * MeV
source.particle = "gamma"
source.position.type = "sphere"
source.position.radius = 1 * cm
source.direction.type = "iso"
source.activity = 100 * Bq

# filter: keep gamma
f = sim.add_filter("ParticleFilter", "f")
f.particle = "gamma"
# filter: keep e-
fp = sim.add_filter("ParticleFilter", "fp")
fp.particle = "e-"
# filter: energy
fk = sim.add_filter("KineticEnergyFilter", "fk")
fk.energy_min = 100 * keV

# add dose actor
dose = sim.add_actor("DoseActor", "dose")
dose.output_filename = "test023_iec_phantom.mhd"
dose.attached_to = "iec"
dose.size = [100, 100, 100]
dose.spacing = [2 * mm, 2 * mm, 2 * mm]
dose.filters = [fp, fk]

# add stat actor
stat = sim.add_actor("SimulationStatisticsActor", "Stats")
stat.track_types_flag = True
stat.filters.append(f)

print("Filters: ", sim.filter_manager)
print(sim.filter_manager.dump())

# change physics
sim.physics_manager.physics_list_name = "QGSP_BERT_EMZ"
sim.physics_manager.global_production_cuts.all = 0.1 * mm
sim.user_hook_after_init = check_production_cuts

# start simulation
#sim.run(start_new_process=True) # start the simulation in a subprocess
sim.run()
print(stat)

the output is as below:

c:\Users\zhang\miniconda3\envs\gate\Lib\site-packages\opengate_core
Filters:   (0)
Number of filters: 0
Simulation: create RunManager (single thread)
Simulation: initialize Geometry
Simulation: initialize Physics
Simulation: initialize Source
Simulation: initialize Visualization
Simulation: initialize G4RunManager
Simulation: initialize PhysicsEngine after RunManager initialization
Simulation: initialize actors
Simulation: check volumes overlap
Simulation: initialize user fct
Entered hook
Known regions are:
*****
DefaultRegionForTheWorld
Cuts in this region:
gamma: 0.1
electron: 0.1
proton: 0.1
positron: 0.1
*****
DefaultRegionForParallelWorld
Cuts in this region:
gamma: 0.1
electron: 0.1
proton: 0.1
positron: 0.1
--------------------------------------------------------------------------------
Simulation: START 
Simulation: STOP. Run: 1. Time: 5.9 seconds.
--------------------------------------------------------------------------------
runs                1 
events              92 
tracks              188 
steps               564 
init                5.8755 s
duration            1.80689 s
pps                 50 
tps                 104 
sps                 312 
start_time          Wed Feb 26 11:12:54 2025 
stop_time           Wed Feb 26 11:13:02 2025 
sim_start_time      0.0 ps
sim_stop_time       1.0 s
threads             1 
arch                Windows 
python              3.12.8 
track_types
                        e-: 92
                        gamma: 96