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                            gapPocaRibbon( )      -> if the track actually hits a ribbon that isn't in an overlap area, uses 3D poca to ribbon center
                            gapPocaTile( )          -> if the track hits a tile, uses -1 * 3D poca to tile edge
                            fallbackToNominal()  -> if the track doesn't hit any GEANT element,  uses 2D "active distance"  ( 5.  -  fabs(x-x0) ) to gap
 

                  AcdReconAlg:: calcCornerDoca(...)

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