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Place the space-frame sectors explicitly instead of dividing BBMO #15809

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Place the space-frame sectors explicitly instead of dividing BBMO #15809

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16 changes: 15 additions & 1 deletion Detectors/Passive/src/FrameStructure.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -1789,7 +1789,21 @@ void FrameStructure::ConstructGeometry()
ppgon[9] = ppgon[6];

vmc->Gsvolu("BBMO", "PGON", kAir, ppgon, 10);
vmc->Gsdvn("BBCE", "BBMO", 18, 2);

// The 18 sectors, placed one by one rather than made with a phi division.
// Geant4 has no faithful representation of a phi division of a polyhedra: it
// divides by the number of sides and ignores the requested width and offset,
// so the sector contents end up half a sector away from where TGeo puts them.
const int kNSectors = 18;
const float kSectorDphi = 360. / kNSectors;
TGeoPgon* shBBCE = new TGeoPgon(-kSectorDphi / 2., kSectorDphi, 1, 2);
shBBCE->DefineSection(0, -kBBMdz / 2., kBBMRin, kBBMRou);
shBBCE->DefineSection(1, kBBMdz / 2., kBBMRin, kBBMRou);
TGeoVolume* voBBCE = new TGeoVolume("BBCE", shBBCE, kMedAir);
TGeoVolume* voBBMO = gGeoManager->GetVolume("BBMO");
for (i = 0; i < kNSectors; i++) {
voBBMO->AddNode(voBBCE, i + 1, new TGeoRotation("", (i + 0.5) * kSectorDphi, 0., 0.));
}

// CBL ////////////////////////////////////////////////////////
//
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