Geant4 Integration Status

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Geant4 integration status ● All CMS shapes integrated: box, tube, trapezoid, cone, polycone, and polyhedra – stress-tested with Geant4 test job FullCMS, a few warnings printed multiple times, ~ all of them coming from polycone or polyhedron special cases. – several fixes uploaded, job still crashes using VecGeom shapes (runs to the end using Geant4 or USolids shapes) ● ...and a few more: Trd, torus2, paraboloid, orb, sphere – integrated, but not stress-tested yet, since not used in FullCMS geant4 test job. G. Lima – GeantV weekly meeting – 2015/10/27 1 During code sprint ● With Sandro, fixed few more bugs with the tube (point near phi- section surface) and polycone (near a ~vertical section) ● Changes in USolids shapes, to inherit from specialized shapes instead of “simple shapes” ● Crashes due to Normal() calculation returning (0,0,0) when fully inside, but at the z-plane between sections z Both sections need to be checked, and several possible section outcomes Q combined → normals added: +z + (-z) = (0,0,0) G. Lima – GeantV weekly meeting – 2015/10/27 2 Geant4 integration status ● What happened since our code sprint? – More exceptions related to Inside/Contains inconsistencies, triggered at Geant4 navigation tests ● outPoint, dir → surfPoint = outPoint + step * dir ● Inside(surfPoint) → kOutside (should be surface) Both sections need to be checked, several possible section outcomes combined, e.g. in+in = in surf + out = surf, etc... P G. Lima – GeantV weekly meeting – 2015/10/27 3 Geant4 integration status ● What happened after our code sprint? – Normal() fix required a similar set of steps → code duplication ● GenericKernelContainsAndInside() ● ConeImplementation::NormalKernel() (vector mode) ● UnplacedCone::Normal() (scalar mode) – First attempt involved Normal (0,0,0) and valid=false for all points away from surface --- unacceptable for navigation – Currently a valid normal is P always provided, BUT it is not always the best one (a performance priority choice) n G. Lima – GeantV weekly meeting – 2015/10/27 4 Geant4 integration status ● Last few weeks – Git cleanup (jira-175, jira-151, master/devel) – fixes to unit tests in Trd, Cone, Polycones, including convexity checks – all fixes so far are in lima/jira-151 branch (still more fixes needed) – merge requested → requests by Sandro included choosing the best of two kernel Contains() implementations – Validating polycone → UPolycone is not validated (ignored) – orthogonal: GPU performance measurements (build problems) G. Lima – GeantV weekly meeting – 2015/10/27 5 Short term plans ● Geant4 plans to drop USolids source from their repository → rely on Usolids code from VecGeom repository – immediate plans to release integrated shapes ● Short-term goals: – more bug fixes: polycone, polyhedron. trapezoid coplanarity? – move to cms2015.gdml (torus, trd) – integration code review – merge branch lima/jira-151 (integration) G. Lima – GeantV weekly meeting – 2015/10/27 6.

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