Fix extrusions for OT layers

Author: scannito

Detectors/Upgrades/ALICE3/TRK/simulation/include/TRKSimulation/TRKLayer.h

@@ -146,6 +146,9 @@ class TRKOTLayer : public TRKSegmentedLayer
   static constexpr double sInStaveOverlap = constants::moduleMLOT::gaps::outerEdgeLongSide + constants::moduleMLOT::chip::passiveEdgeReadOut + 0.1; // 1.5mm outer-edge + 1mm deadzone + 1mm (true) overlap
   static constexpr double sStaveWidth = constants::OT::width - sInStaveOverlap;
 
+  // Override to account for the staggering offset present in OT layers
+  std::pair<float, float> getBoundingRadii(double staveWidth) const override;
+
   ClassDefOverride(TRKOTLayer, 0)
 };
 

Detectors/Upgrades/ALICE3/TRK/simulation/src/TRKLayer.cxx

@@ -234,7 +234,7 @@ std::pair<float, float> TRKSegmentedLayer::getBoundingRadii(double staveWidth) c
   }
 
   // Add a 10-micron safety margin to prevent false-positive overlaps in ROOT's geometry checker caused by floating-point inaccuracies
-  const float precisionMargin = 0.001;
+  const float precisionMargin = 0.05f;
 
   return {radiusMin - precisionMargin, radiusMax + precisionMargin};
 }
@@ -353,7 +353,7 @@ std::pair<float, float> TRKMLLayer::getBoundingRadii(double staveWidth) const
   float v_max = avgRadiusOuter * std::cos(alpha) + staveSizeY / 2.0;
   float radiusMax = std::sqrt(u_max * u_max + v_max * v_max);
 
-  const float precisionMargin = 0.001;
+  const float precisionMargin = 0.05f;
 
   return {radiusMin, radiusMax + precisionMargin};
 }
@@ -448,6 +448,13 @@ void TRKOTLayer::createLayer(TGeoVolume* motherVolume)
   LOGP(debug, "Inserting {} in {} ", layerVol->GetName(), motherVolume->GetName());
   motherVolume->AddNode(layerVol, 1, nullptr);
 }
+
+std::pair<float, float> TRKOTLayer::getBoundingRadii(double staveWidth) const
+{
+  auto [radiusMin, radiusMax] = TRKSegmentedLayer::getBoundingRadii(staveWidth);
+
+  return {radiusMin - 0.201f, radiusMax};
+}
 // ClassImp(TRKLayer);
 
 } // namespace trk