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import unittest
import numpy as np
from chroma.geometry import Solid, Geometry, vacuum
from chroma.make import box
from chroma.sim import Simulation
from chroma.event import Photons
class TestPropagation(unittest.TestCase):
def testAbort(self):
'''Photons that hit a triangle at normal incidence should not abort.
Photons that hit a triangle at exactly normal incidence can sometimes
produce a dot product that is outside the range allowed by acos().
Trigger these with axis aligned photons in a box.
'''
# Setup geometry
cube = Geometry(vacuum)
cube.add_solid(Solid(box(100,100,100), vacuum, vacuum))
cube.pmtids = [0]
cube.build(use_cache=False)
sim = Simulation(cube, geant4_processes=0)
# Create initial photons
nphotons = 10000
pos = np.tile([0,0,0], (nphotons,1)).astype(np.float32)
dir = np.tile([0,0,1], (nphotons,1)).astype(np.float32)
pol = np.zeros_like(pos)
phi = np.random.uniform(0, 2*np.pi, nphotons).astype(np.float32)
pol[:,0] = np.cos(phi)
pol[:,1] = np.sin(phi)
t = np.zeros(nphotons, dtype=np.float32)
wavelengths = np.empty(nphotons, np.float32)
wavelengths.fill(400.0)
photons = Photons(pos=pos, dir=dir, pol=pol, t=t,
wavelengths=wavelengths)
# First make one step to check for strangeness
photons_end = sim.simulate([photons], keep_photons_end=True,
max_steps=1).next().photons_end
self.assertFalse(np.isnan(photons_end.pos).any())
self.assertFalse(np.isnan(photons_end.dir).any())
self.assertFalse(np.isnan(photons_end.pol).any())
self.assertFalse(np.isnan(photons_end.t).any())
self.assertFalse(np.isnan(photons_end.wavelengths).any())
# Now let it run the usual ten steps
photons_end = sim.simulate([photons], keep_photons_end=True,
max_steps=10).next().photons_end
aborted = (photons_end.flags & (1 << 31)) > 0
print 'aborted photons: %1.1f' % \
(float(np.count_nonzero(aborted)) / nphotons)
self.assertFalse(aborted.any())
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