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Surfaces Roundtrip

Info flow

  1. NuWa-trunk/dybgaudi/Detector/XmlDetDesc/DDDB detdesc into Geant4 objects via GiGa
  2. G4DAE persisted from Geant4 memory into DAE extras
  3. ColladaToChroma : pycollada read of extras via DAENode DAEGeometry into Chroma objects
  4. Chroma push to GPU

Issue : Model mismatch

Sensdet Geant4/NuWa vs Chroma model difference

  1. Chroma is expecting sensitive detectors to have associated surfaces with all the requisite props to furnish SURFACE_DETECT hits.
  2. Geant4/NuWa expecting sensitive volumes to...

Issue : Missing bordersurface

  1. All 8 bordersurface are missing
{'border': ['ESRAirSurfaceTop',
            'ESRAirSurfaceBot',
            'NearIWSCurtain',
            'NearOWSLiner',
            'NearDeadLiner',
            'SSTWaterSurfaceNear1',
            'SSTWaterSurfaceNear2',
            'SSTOil'],
  1. pv pairing ambiguity is apparent
  2. also need to add 2nd surface index to chroma model and pick which one based on in-to-out or out-to-in
In [9]: bordersurface['SSTOil']    # inside border of SST and MineralOil it contains
Out[9]:
<BorderSurface AdDetails__AdSurfacesAll__SSTOilSurface <OpticalSurface f3 m1 t0 v1 pREFLECTIVITY:4 > >
     pv1 (2) AD__lvSST--pvOIL0xc241510
       __dd__Geometry__AD__lvSST--pvOIL0xc241510.0             __dd__Materials__MineralOil0xbf5c830
       __dd__Geometry__AD__lvSST--pvOIL0xc241510.1             __dd__Materials__MineralOil0xbf5c830
     pv2 (2) AD__lvADE--pvSST0xc128d90
       __dd__Geometry__AD__lvADE--pvSST0xc128d90.0             __dd__Materials__StainlessSteel0xc2adc00
       __dd__Geometry__AD__lvADE--pvSST0xc128d90.1             __dd__Materials__StainlessSteel0xc2adc00


In [10]: bordersurface['SSTWaterSurfaceNear1']   # outside of SST and surrounding water
Out[10]:
<BorderSurface AdDetails__AdSurfacesNear__SSTWaterSurfaceNear1 <OpticalSurface f3 m1 t0 v1 pREFLECTIVITY:4 > >
     pv1 (1) Pool__lvNearPoolIWS--pvNearADE10xc2cf528
       __dd__Geometry__Pool__lvNearPoolIWS--pvNearADE10xc2cf528.0             __dd__Materials__IwsWater0xc288f98
     pv2 (2) AD__lvADE--pvSST0xc128d90
       __dd__Geometry__AD__lvADE--pvSST0xc128d90.0             __dd__Materials__StainlessSteel0xc2adc00
       __dd__Geometry__AD__lvADE--pvSST0xc128d90.1             __dd__Materials__StainlessSteel0xc2adc00

In [11]: bordersurface['SSTWaterSurfaceNear2']   # huh
Out[11]:
<BorderSurface AdDetails__AdSurfacesNear__SSTWaterSurfaceNear2 <OpticalSurface f3 m1 t0 v1 pREFLECTIVITY:4 > >
     pv1 (1) Pool__lvNearPoolIWS--pvNearADE20xc0479c8
       __dd__Geometry__Pool__lvNearPoolIWS--pvNearADE20xc0479c8.0             __dd__Materials__IwsWater0xc288f98
     pv2 (2) AD__lvADE--pvSST0xc128d90
       __dd__Geometry__AD__lvADE--pvSST0xc128d90.0             __dd__Materials__StainlessSteel0xc2adc00
       __dd__Geometry__AD__lvADE--pvSST0xc128d90.1             __dd__Materials__StainlessSteel0xc2adc00

Seeing how event number 1 photons gets propagated with partial geometry is interesting:

g4daeview.sh --geometry-regexp ADE1 --load 1                     ## not many photons escape the water ?
g4daeview.sh --geometry-regexp pvNearADE10xc2cf528.0 --load 1    ## seemingly no photons escape the water column

g4daeview.sh --geometry-regexp ADE2 --load 1                     ## backspill
g4daeview.sh --geometry-regexp pvNearADE20xc0479c8.0  --load 1   ## lots of backspill manage to enter water though

detdesc level

  • perusing DDDB would suggest some surfaces are missing

xmldae level (raw DAE XML)

Comparing ChromaSurfaceMap and raw xml with xmldae.sh –ipy –surface missing marked with -:

delta:~ blyth$ xmldae.sh --ipy --surface
...
[ 11] __dd__Geometry__PoolDetails__NearPoolSurfaces__

     +NearInnOutPiper
     -NearPoolCover
     +TopShortCableTray
     +NearInnInPiper
     +NearOutOutPiper
     -NearIWSCurtain
     -NearOWSLiner
     -NearDeadLiner
     +UnistrutRib7
     +NearOutInPiper
     +UnistrutRib6

[  5] __dd__Geometry__AdDetails__AdSurfacesAll__

     +AdCableTray
     -ESRAirSurfaceTop
     -ESRAirSurfaceBot
     +RSOil
     -SSTOil

[  2] __dd__Geometry__AdDetails__AdSurfacesNear__

     -SSTWaterSurfaceNear1
     -SSTWaterSurfaceNear2

[ 24] __dd__Geometry__PoolDetails__PoolSurfacesAll__

     +PmtMtRib2
     +TopCornerCableTray
     +TablePanel
     +UnistrutRib2
     +UnistrutRib3
     +UnistrutRib8
     +LegInOWSTub
     +SlopeRib5
     +PmtMtBaseRing
     +LegInDeadTub
     +PmtMtRib1
     +SupportRib5
     +PmtMtRib3
     +UnistrutRib1
     +LegInIWSTub
     +ADVertiCableTray
     +UnistrutRib9
     +VertiCableTray
     +ShortParCableTray
     +SlopeRib1
     +PmtMtTopRing
     +SupportRib1
     +UnistrutRib4
     +UnistrutRib5

2014-07-11 17:03:04,859 env.geant4.geometry.collada.xmldae INFO     found 42 raw opticalsurface elements, 9 of which are missing from csm

Initially all 8 bordersurface are missing and 1 skinsurface is missing (‘NearPoolCover’). Maybe NearPoolCover missing from CSM as default geometry selection excludes it:

In [6]: print ET.tostring(raw['skin']['NearPoolCover'])
<skinsurface xmlns="http://www.collada.org/2005/11/COLLADASchema" name="__dd__Geometry__PoolDetails__NearPoolSurfaces__NearPoolCoverSurface" surfaceproperty="__dd__Geometry__PoolDetails__NearPoolSurfaces__NearPoolCoverSurface">
        <volumeref ref="__dd__Geometry__PoolDetails__lvNearTopCover0xc137060"/>
      </skinsurface>

Yep, after adding a more complete dybf geometry and using that get:

not_in_csm:
{'border': ['ESRAirSurfaceTop',
            'ESRAirSurfaceBot',
            'NearIWSCurtain',
            'NearOWSLiner',
            'NearDeadLiner',
            'SSTWaterSurfaceNear1',
            'SSTWaterSurfaceNear2',
            'SSTOil'],
 'optical': ['ESRAirSurfaceTop',
             'ESRAirSurfaceBot',
             'NearIWSCurtain',
             'NearOWSLiner',
             'NearDeadLiner',
             'SSTWaterSurfaceNear1',
             'SSTWaterSurfaceNear2',
             'SSTOil'],
 'skin': []}


In [3]: not_in_csm['border'] == not_in_csm['optical']
Out[3]: True

daenode level

delta:~ blyth$ daenode.sh --ipy
2014-07-11 17:38:53,158 env.geant4.geometry.collada.daenode:1763 INFO     /Users/blyth/env/bin/daenode.py
2014-07-11 17:38:54,914 env.geant4.geometry.collada.daenode:1806 INFO     drop into embedded IPython
Python 2.7.6 (default, Nov 18 2013, 15:12:51)
Type "copyright", "credits" or "license" for more information.

IPython 1.2.1 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object', use 'object??' for extra details.

In [1]: DAENode.extra
Out[1]: DAEExtra skinsurface 34 bordersurface 8 opticalsurface 42 skinmap 34 bordermap 13

In [2]: DAENode.extra.__class__
Out[2]: env.geant4.geometry.collada.daenode.DAEExtra


In [2]: DAENode.extra.bordersurface
Out[2]:
[<BorderSurface AdDetails__AdSurfacesAll__ESRAirSurfaceTop <OpticalSurface f0 m1 t0 v0 pREFLECTIVITY:31 > >
     pv1 (2) AdDetails__lvTopReflector--pvTopRefGap0xc266468
       __dd__Geometry__AdDetails__lvTopReflector--pvTopRefGap0xc266468.0             __dd__Materials__Air0xc032550
       __dd__Geometry__AdDetails__lvTopReflector--pvTopRefGap0xc266468.1             __dd__Materials__Air0xc032550
     pv2 (2) AdDetails__lvTopRefGap--pvTopESR0xc4110d0
       __dd__Geometry__AdDetails__lvTopRefGap--pvTopESR0xc4110d0.0             __dd__Materials__ESR0xbf9f438
       __dd__Geometry__AdDetails__lvTopRefGap--pvTopESR0xc4110d0.1             __dd__Materials__ESR0xbf9f438 ,
 <BorderSurface AdDetails__AdSurfacesAll__ESRAirSurfaceBot <OpticalSurface f0 m1 t0 v0 pREFLECTIVITY:31 > >
     pv1 (2) AdDetails__lvBotReflector--pvBotRefGap0xbfa6458
       __dd__Geometry__AdDetails__lvBotReflector--pvBotRefGap0xbfa6458.0             __dd__Materials__Air0xc032550
       __dd__Geometry__AdDetails__lvBotReflector--pvBotRefGap0xbfa6458.1             __dd__Materials__Air0xc032550
     pv2 (2) AdDetails__lvBotRefGap--pvBotESR0xbf9bd08
       __dd__Geometry__AdDetails__lvBotRefGap--pvBotESR0xbf9bd08.0             __dd__Materials__ESR0xbf9f438
       __dd__Geometry__AdDetails__lvBotRefGap--pvBotESR0xbf9bd08.1             __dd__Materials__ESR0xbf9f438 ,
 <BorderSurface AdDetails__AdSurfacesAll__SSTOilSurface <OpticalSurface f3 m1 t0 v1 pREFLECTIVITY:4 > >
     pv1 (2) AD__lvSST--pvOIL0xc241510
       __dd__Geometry__AD__lvSST--pvOIL0xc241510.0             __dd__Materials__MineralOil0xbf5c830
       __dd__Geometry__AD__lvSST--pvOIL0xc241510.1             __dd__Materials__MineralOil0xbf5c830
     pv2 (2) AD__lvADE--pvSST0xc128d90
       __dd__Geometry__AD__lvADE--pvSST0xc128d90.0             __dd__Materials__StainlessSteel0xc2adc00
       __dd__Geometry__AD__lvADE--pvSST0xc128d90.1             __dd__Materials__StainlessSteel0xc2adc00 ,


In [9]: bordersurface['SSTOil']
Out[9]:
<BorderSurface AdDetails__AdSurfacesAll__SSTOilSurface <OpticalSurface f3 m1 t0 v1 pREFLECTIVITY:4 > >
     pv1 (2) AD__lvSST--pvOIL0xc241510
       __dd__Geometry__AD__lvSST--pvOIL0xc241510.0             __dd__Materials__MineralOil0xbf5c830
       __dd__Geometry__AD__lvSST--pvOIL0xc241510.1             __dd__Materials__MineralOil0xbf5c830
     pv2 (2) AD__lvADE--pvSST0xc128d90
       __dd__Geometry__AD__lvADE--pvSST0xc128d90.0             __dd__Materials__StainlessSteel0xc2adc00
       __dd__Geometry__AD__lvADE--pvSST0xc128d90.1             __dd__Materials__StainlessSteel0xc2adc00

In [10]: bordersurface['SSTWaterSurfaceNear1']
Out[10]:
<BorderSurface AdDetails__AdSurfacesNear__SSTWaterSurfaceNear1 <OpticalSurface f3 m1 t0 v1 pREFLECTIVITY:4 > >
     pv1 (1) Pool__lvNearPoolIWS--pvNearADE10xc2cf528
       __dd__Geometry__Pool__lvNearPoolIWS--pvNearADE10xc2cf528.0             __dd__Materials__IwsWater0xc288f98
     pv2 (2) AD__lvADE--pvSST0xc128d90
       __dd__Geometry__AD__lvADE--pvSST0xc128d90.0             __dd__Materials__StainlessSteel0xc2adc00
       __dd__Geometry__AD__lvADE--pvSST0xc128d90.1             __dd__Materials__StainlessSteel0xc2adc00

In [11]: bordersurface['SSTWaterSurfaceNear2']
Out[11]:
<BorderSurface AdDetails__AdSurfacesNear__SSTWaterSurfaceNear2 <OpticalSurface f3 m1 t0 v1 pREFLECTIVITY:4 > >
     pv1 (1) Pool__lvNearPoolIWS--pvNearADE20xc0479c8
       __dd__Geometry__Pool__lvNearPoolIWS--pvNearADE20xc0479c8.0             __dd__Materials__IwsWater0xc288f98
     pv2 (2) AD__lvADE--pvSST0xc128d90
       __dd__Geometry__AD__lvADE--pvSST0xc128d90.0             __dd__Materials__StainlessSteel0xc2adc00
       __dd__Geometry__AD__lvADE--pvSST0xc128d90.1             __dd__Materials__StainlessSteel0xc2adc00

Use of surfaces by Chroma

Without associated surface_index never get SURFACE_ABSORB, SURFACE_DETECT, REFLECT_DIFFUSE?

chroma/cuda/propagate_vbo.cu:

616        // PASS goes on to either at_surface/at_boundary handling
617        // depending on surface association
621        if (s.surface_index != -1)
622        {
625            // #. SURFACE_ABSORB(BREAK)
626            // #. SURFACE_DETECT(BREAK)
627            // #. REFLECT_DIFFUSE(CONTINUE) .direction .polarization
628            // #. REFLECT_SPECULAR(CONTINUE) .direction
629            // #. NO other option, so never PASS?
631            command = propagate_at_surface(p, s, rng, g, use_weights);
636            if (command == BREAK) break ;
637            if (command == CONTINUE) continue;
641        }
642
643        // **propagate_at_boundary**
644        // depending on materials refractive indices and incidence angle
645        //
646        // #. "CONTINUE" REFLECT_SPECULAR  .direction .polarization
647        // #. "CONTINUE" "REFRACT"         .direction .polarization
648        // #. NO other option
649
650        propagate_at_boundary(p, s, rng);
654

surface association

Triangle material_codes lookup: g->material_codes[p.last_hit_triangle] gives materials and maybe surface associated.

165 __device__ void
166 fill_state(State &s, Photon &p, Geometry *g)
167 {
168     p.last_hit_triangle = intersect_mesh(p.position, p.direction, g,
169                                          s.distance_to_boundary,
170                                          p.last_hit_triangle);
...
179     Triangle t = get_triangle(g, p.last_hit_triangle);
180
181     unsigned int material_code = g->material_codes[p.last_hit_triangle];
182
183     int inner_material_index = convert(0xFF & (material_code >> 24));
184     int outer_material_index = convert(0xFF & (material_code >> 16));
185     s.surface_index = convert(0xFF & (material_code >> 8));
186
...    convert just makes -1 if needed

propagate_at_surface

Wavelength dependant surface props needed by propagate_at_surface

  • detect
  • absorb
  • reflect_diffuse
  • reflect_specular

chroma/cuda/photon.h:

701 __device__ int
702 propagate_at_surface(Photon &p, State &s, curandState &rng, Geometry *geometry,
703                      bool use_weights=false)
704 {
705     Surface *surface = geometry->surfaces[s.surface_index];
706
707     if (surface->model == SURFACE_COMPLEX)
708         return propagate_complex(p, s, rng, surface, use_weights);
709     else if (surface->model == SURFACE_WLS)
710         return propagate_at_wls(p, s, rng, surface, use_weights);
711     else
712     {
713         // use default surface model: do a combination of specular and
714         // diffuse reflection, detection, and absorption based on relative
715         // probabilties
716
717         // since the surface properties are interpolated linearly, we are
718         // guaranteed that they still sum to 1.0.
719         float detect = interp_property(surface, p.wavelength, surface->detect);
720         float absorb = interp_property(surface, p.wavelength, surface->absorb);
721         float reflect_diffuse = interp_property(surface, p.wavelength, surface->reflect_diffuse);
722         float reflect_specular = interp_property(surface, p.wavelength, surface->reflect_specular);
723

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