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function in last commit.
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update remaining unit tests to build BVHs with
``loader.create_geometry_from_obj`` instead of the (removed) ``build``
method.
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The ``Material`` struct now includes two new arrays: ``reemission_prob`` and ``reemission_cdf``. The former is sampled only when a photon is absorbed, and should be normalized accordingly. The latter defines the distribution from which the reemitted photon wavelength is drawn.
This process changes the photon wavelength in place, and is not capable of producing multiple secondaries. It also does not enforce energy conservation; the reemission spectrum is not itself wavelength-dependent.
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These classes will be the data types used by the new BVH generation code.
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The storage format is changing relative to the old format, so all
geometry files will be saved in the ~/.chroma/geo directory. For now,
the format is just a simple pickle. We know this is not optimal for
space or speed, but the Geometry class will be changing soon, and we
can optimize further after that.
This Cache class will also soon manage the separate BVH cache.
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remove requirement to use numpy >= 1.6
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geometry, like the mapping from solid IDs to channels, and the time
and charge distributions.
Detector is a subclass of Geometry, so that a Detector can be used
wherever a Geometry is used. Only code (like the DAQ stuff) that
needs to know how PMT solids map to channels should look for a
Detector object.
There is a corresponding GPUDetector class as well, with its own
device side struct to hold PMT channel information.
The GPU code now can sample an arbitrary time and charge PDF, but
on the host side, the only interface exposed right now creates
a Gaussian distribution.
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millimeters/nanoseconds/MeV in order to match GEANT4, and also avoid
huge discrepancies in magnitude caused by values like 10e-9 sec.
Along the way, cleaned up a few things:
* Switch the PI and SPEED_OF_LIGHT constants from double to single
precision. This avoid some unnecessary double precision calculations
in the GPU code.
* Fixed a silly problem in the definition of the spherical spiral. Now
the demo detector looks totally awesome. Also wrapped it in a
black surface. Demo detector now has 10055 PMTs.
* Updated the test_ray_intersection data file to reflect the new units.
* Fix a missing import in chroma.gpu.tools
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Rayleigh scattering unit test
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experiment information.
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context can be setup and torn down correctly around the test.
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calculation of the path to the CUDA source code in one place.
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