  The correctness and precision of particle physics simulation software, such
as Geant4, is expected to yield results that closely align with real-world
observations or well-established theoretical predictions. Notably, the accuracy
of these simulated outcomes is contingent upon the software's capacity to
encapsulate detailed attributes, including its prowess in generating or
incorporating complex geometrical constructs. While the imperatives of
precision and accuracy are essential in these simulations, the need to manually
code highly detailed geometries emerges as a salient bottleneck in developing
software-driven physics simulations. This research proposes Blender-to-Geant4
(B2G4), a modular data workflow that utilizes Blender to create 3D scenes,
which can be exported as geometry input for Geant4. B2G4 offers a range of
tools to streamline the creation of simulation scenes with multiple complex
geometries and realistic material properties. Here, we demonstrate the use of
B2G4 in a muon scattering tomography application to image the interior of a
sealed steel structure. The modularity of B2G4 paves the way for the designed
scenes and tools to be embedded not only in Geant4, but in other scientific
applications or simulation software.
