+
+ // Geometry builder
+ fGeometryBuilder = new AliMUONGeometryBuilder(this);
+
+ // Common geometry definitions
+ fGeometryBuilder
+ ->AddBuilder(new AliMUONCommonGeometryBuilder(this));
+
+ // Define the global transformation:
+ // Transformation from the old ALICE coordinate system to a new one:
+ // x->-x, z->-z
+ TGeoRotation* rotGlobal
+ = new TGeoRotation("rotGlobal", 90., 180., 90., 90., 180., 0.);
+ fGeometryBuilder
+ ->SetGlobalTransformation (TGeoCombiTrans(0., 0., 0., rotGlobal));
+
+ // Detection elements indexing
+ fDEIndexing = new AliMUONGeometryDEIndexing();
+