Control the initial and ending regions of particle emission

Particles, Track, Event, Run and Biasing
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_Geant4 Version:_11.1.1
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—I used a small detector to simulate the process of particle collection in an open sky. The particle emission angle is random, but only a very small portion of the emitted particles reach the detector, which is a waste of time. Therefore, I wanted to control the termination area of particle emission or find a way to limit the particles from reaching a certain area during transmission, but I have not found a solution.

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Are you using G4GeneralParticleSource in your PrimaryGeneratorAction? That has options to control emission directions and similar.

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I don’t want to control the emission angle of each particle, but I hope that all particles can be emitted to the same area, and the particle angle can be random after being emitted to that area.

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