fix handling of air/iron in DD4hep MF construction

cms-sw · Apr 30, 2021 · e0bd8d2 · e0bd8d2
1 parent 6d2f660
commit e0bd8d2
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/MagneticField/GeomBuilder/src/DD4hep_volumeHandle.cc b/MagneticField/GeomBuilder/src/DD4hep_volumeHandle.cc
@@ -137,8 +137,8 @@ volumeHandle::volumeHandle(const cms::DDFilteredView &fv, bool expand2Pi, bool d
           << "ctor: Unexpected shape # " << static_cast<int>(theShape) << " for vol " << name;
   }
 
-  // Get material for this volume
-  if (fv.materialName() == "Iron")
+  // The only materials used in the geometry are: materials:Air, d=0.001214; materials:Iron, d=7.87
+  if (fv.volume().material().density() > 3.)
     isIronFlag = true;
 
   if (debug) {