Scoring particles re-entering a volume

Dear all,

I have two volumes (see figure 1). I am scoring particles entering volume 1 in .mac file using: /score/quantity/flatSurfaceCurrent scoring_data 1 true false.

I would like also to score particles re-entering the volume 1 from volume 2. Any hint would be greatly appreciated. Thank you!

Cheers
A.H.!
figure1|434x387