J.R. Tickner, XPERT – a system for geometry definition, verification and visualisation. he task of defining, verifying and maintaining a complex, 3-dimensional geometry model for a modern Monte Carlo code typically occupies a large fraction of the total time required to set up a particle transport simulation. To address this problem, the computer code XPERT has been developed. Key features of this system discussed in this paper include: a constraint-based, hierarchical, constructive solid geometry modeler; efficient, automated geometry validation routines and real time, 3-dimensional wire-frame and solid geometry visualization. The XPERT system has been interfaced to the EGS and MCNP codes as well as an in-house, optical photon transport code. Examples illustrating the above features are presented for these codes.

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