Abstract: The Monte Carlo application toolkit Geant4 is primarily used for simulating the physical processes of particle transport in matter. It is widely applied in various fields such as space applications, radiation medicine, and accelerator physics. However, the default user interface of Geant4 is simple, and the input files and commands can be cumbersome, resulting in poor usability. Firstly, Leveraging the open-source pre-and post-processing integrated platform of FastCAE, key technical research was conducted to integrate the Geant4 solver. This research includes the development of a simulation software solution that integrates geometry modeling, mesh generation, solver computation, and post- processing visualization. Secondly, to address the issue of converting geometric models into physical geometries within the integration, two file conversion methods, namely “Geometry” and “mesh”, were developed. Additionally, Geant4 calculation results were visualized by converting the result files in vtu and vtp formats into vtk files. Lastly, through the implementation of a proton therapy case study, the complete integration process of Geant4 was achieved, demonstrating the effectiveness and usability of the developed mesh conversion methods and visualization techniques. The proposed solution can improve the efficiency of Geant4 development and accelerate the process of productization.

Key words: geometry and tracking 4(Geant4), generation of physical geometries, visualization, solver integration, fast computer-aided engineering(FastCAE)