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Add examples/viztracks/ that converts GPU photon step records into G4VTrajectory objects for Geant4 interactive visualization. Uses KeepTheCurrentEvent to preserve the event, then injects trajectories from the Opticks record array in EndOfRunAction.
Aligned validation using precooked curand Philox sequences so G4 consumes the same random numbers as the GPU. Includes: - StandAloneGeant4Validation with ShimG4Op* for RNG alignment - generate_precooked_rng.cu for Philox sequence generation - compare_aligned.py for flag/position/chi2 comparison - raindrop configs for testing Tested on raindrop geometry: 10000/10000 photons match (100%).
- StandAloneGeant4Validation: add StepRecordAccumulator that saves per-step photon positions as g4_record.npy (N, 32, 4, 4), matching the Opticks record.npy format for photon-by-photon track comparison - Add plot_divergent_tracks.py: VTK offscreen renderer that overlays GPU (red) and G4 (blue) photon tracks on GDML wireframe geometry - Add apex.json config for apex.gdml torch photon simulation
apex.gdml: scintillator detector with WLS plates, SiPMs, and Vikuiti reflective foil wrapping (500x500x6mm flat detector). sphere_leak_simple.gdml: nested sphere mirror leak test with dielectric_metal skinsurface, no RINDEX on mirror material — verified zero-leak configuration for both GPU and G4.
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Add examples/viztracks/ that converts GPU photon step records into G4VTrajectory objects for Geant4 interactive visualization. Uses KeepTheCurrentEvent to preserve the event, then injects trajectories from the Opticks record array in EndOfRunAction.