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There is a whole 'nother way to do this.
Start with a simulation of just the target in G4beamline. Use this command:
newparticlentuple First require=ParentID>0 kill=1 format=ascii
This writes an NTuple file "First.txt" containing just the secondary particles from beam interactions, killing them after outputting (to not waste time).
Now write a filter program to read First.txt and write an NTuple to "Second.txt". In this program you impose whatever constraints and biases you wish. The ASCII NTuple format is documented in the G4beamline Users Guide.
Then use Second.txt as input to the second simulation in G4beamline (as you indicated you intend to do).
This has the advantage that except for reading and writing the ASCII files, the only code you write is to implement the specific constraints and biases you want -- you have to do that no matter how you implement it. You aren't even limited to C++, as any language can read and write the ASCII NTuple files.
The disadvantage is that you have no access to the geometry information, and will have slightly less performance (negligible for any non-trivial simulation).
Note that if you don't handle the value of Weight carefully, you will have difficulty unwinding the biasing later in the analysis.
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