Epic port of Chroma from units of meters/seconds/MeV to

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

1 files changed, 2 insertions, 2 deletions

diff --git a/src/G4chroma.cc b/src/G4chroma.cc
index 340cc4c..c0817a1 100644
--- a/src/G4chroma.cc
+++ b/src/G4chroma.cc
@@ -107,11 +107,11 @@ void PhotonTrackingAction::PreUserTrackingAction(const G4Track *track)
 {
   G4ParticleDefinition *particle = track->GetDefinition();
   if (particle->GetParticleName() == "opticalphoton") {
-    pos.push_back(track->GetPosition()/m);
+    pos.push_back(track->GetPosition()/mm);
     dir.push_back(track->GetMomentumDirection());
     pol.push_back(track->GetPolarization());
     wavelength.push_back( (h_Planck * c_light / track->GetKineticEnergy()) / nanometer );
-    t0.push_back(track->GetGlobalTime() / s);
+    t0.push_back(track->GetGlobalTime() / ns);
     const_cast<G4Track *>(track)->SetTrackStatus(fStopAndKill);
   }
 }