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Workaround for non-null vertexes in event pools #15169

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Merged
jackal1-66 merged 1 commit into from
Mar 17, 2026
+12 −1
Merged

Workaround for non-null vertexes in event pools #15169

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13 changes: 12 additions & 1 deletion Generators/include/Generators/GeneratorFromFile.h
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Original file line number Diff line number Diff line change
Expand Up @@ -89,6 +89,7 @@ class GeneratorFromO2Kine : public o2::eventgen::Generator
void setContinueMode(bool val) { mContinueMode = val; };
/** methods that can be overridden **/
void updateHeader(o2::dataformats::MCEventHeader* eventHeader) override;
const o2::dataformats::MCEventHeader* getOrigMCEventHeader() const { return mOrigMCEventHeader.get(); }

private:
TFile* mEventFile = nullptr; //! the file containing the persistent events
Expand Down Expand Up @@ -138,7 +139,17 @@ class GeneratorFromEventPool : public o2::eventgen::Generator
auto import_good = mO2KineGenerator->importParticles();
// transfer the particles (could be avoided)
mParticles = mO2KineGenerator->getParticles();

auto original_header = mO2KineGenerator->getOrigMCEventHeader();
// Workaround to fix vertex shifted particles from event pools (valid for builds released before 14 March 2026)
if (original_header) {
double vertex[3] = {original_header->GetX(), original_header->GetY(), original_header->GetZ()};
if (vertex[0] != 0. || vertex[1] != 0. || vertex[2] != 0.) {
LOG(debug) << "Subtracting shifted vertex from EventPool: (" << vertex[0] << ", " << vertex[1] << ", " << vertex[2] << ")";
for (auto& p : mParticles) {
p.SetProductionVertex(p.Vx() - vertex[0], p.Vy() - vertex[1], p.Vz() - vertex[2], p.T());
}
}
}
return import_good;
}

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