def propagate(gpu_detector,
number=10,
nphotons=500000,
nthreads_per_block=64,
max_blocks=1024):
"Returns the average number of photons propagated on the GPU per second."
rng_states = gpu.get_rng_states(nthreads_per_block * max_blocks)
run_times = []
for i in tools.progress(list(range(number))):
pos = np.zeros((nphotons, 3))
dir = sample.uniform_sphere(nphotons)
reorder = tools.argsort_direction(dir)
dir = dir[reorder]
pol = normalize(np.cross(sample.uniform_sphere(nphotons), dir))
wavelengths = np.random.uniform(400, 800, size=nphotons)
photons = event.Photons(pos, dir, pol, wavelengths)
gpu_photons = gpu.GPUPhotons(photons)
t0 = time.time()
gpu_photons.propagate(gpu_detector, rng_states, nthreads_per_block,
max_blocks)
cuda.Context.get_current().synchronize()
elapsed = time.time() - t0
if i > 0:
# first kernel call incurs some driver overhead
run_times.append(elapsed)
return nphotons / ufloat((np.mean(run_times), np.std(run_times)))
def constant_photons(pos, n):
#constructs photons at one location with random propagation directions
points = np.empty((n, 3))
points[:] = pos
pos = points
dir = uniform_sphere(n)
pol = np.cross(dir, uniform_sphere(n))
#300 nm is roughly the pseudocumene scintillation wavelength
wavelengths = np.repeat(300.0, n)
return Photons(pos, dir, pol, wavelengths)
def gaussian_sphere(pos, sigma, n):
points = np.empty((n, 3))
points[:, 0] = np.random.normal(0.0, sigma, n) + pos[0]
points[:, 1] = np.random.normal(0.0, sigma, n) + pos[1]
points[:, 2] = np.random.normal(0.0, sigma, n) + pos[2]
pos = points
dir = uniform_sphere(n)
pol = np.cross(dir, uniform_sphere(n))
#300 nm is roughly the pseudocumene scintillation wavelength
wavelengths = np.repeat(300.0, n)
return Photons(pos, dir, pol, wavelengths)
def uniform_photons(inscribed_radius, n):
#constructs photons uniformly throughout the detector inside of the inscribed sphere.
radius_root = inscribed_radius * np.power(np.random.rand(n), 1.0 / 3.0)
theta = np.arccos(np.random.uniform(-1.0, 1.0, n))
phi = np.random.uniform(0.0, 2 * np.pi, n)
points = np.empty((n, 3))
points[:, 0] = radius_root * np.sin(theta) * np.cos(phi)
points[:, 1] = radius_root * np.sin(theta) * np.sin(phi)
points[:, 2] = radius_root * np.cos(theta)
pos = points
dir = uniform_sphere(n)
pol = np.cross(dir, uniform_sphere(n))
#300 nm is roughly the pseudocumene scintillation wavelength
wavelengths = np.repeat(300.0, n)
return Photons(pos, dir, pol, wavelengths)
def intersect(gpu_geometry,
number=100,
nphotons=500000,
nthreads_per_block=64,
max_blocks=1024):
"Returns the average number of ray intersections per second."
distances_gpu = ga.empty(nphotons, dtype=np.float32)
module = gpu.get_cu_module('mesh.h', options=('--use_fast_math', ))
gpu_funcs = gpu.GPUFuncs(module)
run_times = []
for i in tools.progress(list(range(number))):
pos = ga.zeros(nphotons, dtype=ga.vec.float3)
dir = sample.uniform_sphere(nphotons)
reorder = tools.argsort_direction(dir)
dir = ga.to_gpu(gpu.to_float3(dir[reorder]))
t0 = time.time()
gpu_funcs.distance_to_mesh(np.int32(pos.size),
pos,
dir,
gpu_geometry.gpudata,
distances_gpu,
block=(nthreads_per_block, 1, 1),
grid=(pos.size // nthreads_per_block + 1,
1))
cuda.Context.get_current().synchronize()
elapsed = time.time() - t0
if i > 0:
# first kernel call incurs some driver overhead
run_times.append(elapsed)
return nphotons / ufloat((np.mean(run_times), np.std(run_times)))
def render_particle_track(self):
x = 10.0
h = x * np.sqrt(3) / 2
pyramid = make.linear_extrude([-x / 2, 0, x / 2],
[-h / 2, h / 2, -h / 2], h, [0] * 3,
[0] * 3)
marker = Solid(pyramid, vacuum, vacuum)
if self.photon_display_mode == 'beg':
photons = self.ev.photons_beg
else:
photons = self.ev.photons_end
geometry = Geometry()
sample_factor = max(1, len(photons.pos) / 10000)
for pos in photons.pos[::sample_factor]:
geometry.add_solid(marker,
displacement=pos,
rotation=make_rotation_matrix(
np.random.uniform(0, 2 * np.pi),
uniform_sphere()))
geometry = create_geometry_from_obj(geometry)
gpu_geometry = gpu.GPUGeometry(geometry)
self.gpu_geometries = [self.gpu_geometry, gpu_geometry]
def load_photons(number=100, nphotons=500000):
"""Returns the average number of photons moved to the GPU device memory
per second."""
pos = np.zeros((nphotons, 3))
dir = sample.uniform_sphere(nphotons)
pol = normalize(np.cross(sample.uniform_sphere(nphotons), dir))
wavelengths = np.random.uniform(400, 800, size=nphotons)
photons = event.Photons(pos, dir, pol, wavelengths)
run_times = []
for i in tools.progress(list(range(number))):
t0 = time.time()
gpu_photons = gpu.GPUPhotons(photons)
cuda.Context.get_current().synchronize()
elapsed = time.time() - t0
if i > 0:
# first kernel call incurs some driver overhead
run_times.append(elapsed)
return nphotons / ufloat((np.mean(run_times), np.std(run_times)))
def photon_angle(rep, pos=[0, 0, 0]):
off = 200
photon_pos = np.zeros((rep, 3))
upshift = 800
for i in range(5):
photon_pos[i, :] = [
pos[0] - i * 100 + off - 100, pos[1] + off + 400, pos[2] + upshift
]
photon_pos[5, :] = [-800, 600, 800]
photon_dir = np.tile(np.array([0.2, -0.55, -1]), (rep, 1))
pol = np.cross(photon_dir, uniform_sphere(rep))
wavelength = np.repeat(300.0, rep)
return Photons(photon_pos, photon_dir, pol, wavelength), photon_pos
def isotropic():
while True:
yield uniform_sphere()
def isotropic():
while True:
yield uniform_sphere()
def photon_bomb(n,wavelength,pos):
pos = np.tile(pos,(n,1))
dir = uniform_sphere(n)
pol = np.cross(dir,uniform_sphere(n))
wavelengths = np.repeat(wavelength,n)
return Photons(pos,dir,pol,wavelengths)
def render_particle_track(self):
x = 10.0
h = x*np.sqrt(3)/2
pyramid = make.linear_extrude([-x/2,0,x/2], [-h/2,h/2,-h/2], h,
[0]*3, [0]*3)
marker = Solid(pyramid, vacuum, vacuum)
if self.photon_display_mode == 'beg':
photons = self.ev.photons_beg
else:
photons = self.ev.photons_end
geometry = Geometry()
sample_factor = max(1, len(photons.pos) / 10000)
for pos in photons.pos[::sample_factor]:
geometry.add_solid(marker, displacement=pos, rotation=make_rotation_matrix(np.random.uniform(0,2*np.pi), uniform_sphere()))
geometry = create_geometry_from_obj(geometry)
gpu_geometry = gpu.GPUGeometry(geometry)
self.gpu_geometries = [self.gpu_geometry, gpu_geometry]
def photon_bomb(n, wavelength, pos):
pos = np.tile(pos, (n, 1))
dir = uniform_sphere(n)
pol = np.cross(dir, uniform_sphere(n))
wavelengths = np.repeat(wavelength, n)
return Photons(pos, dir, pol, wavelengths)