|Message: Re: how to describe a mountain in Detector constructing||Not Logged In (login)|
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If the mountain is an isolated peak, you could approximate it with one of Geant4's simple or specific solids (a cone, a box, a polycone, etc.).
If you want to accurately model the topography of a ridge above an underground facility, you'll need to implement the topographic information into something like AutoCAD, and use the STEP tools available to convert that to a form which can be imported to Geant4.
That level of detail may not really be necessary, given the scattering and energy smearing which will necessarily occur as a result of the muon transport itself. If the cavern is sufficiently far below ground, or interior to the peak at ground level, the horizontal thickness of rock will be large compared to the vertical, and the topography may not be relevant.
A reasonable approximation then is to generate muons at a surface in the rock a few meters above the ceiling, with an energy and angular distribution computed based on the cavern depth, for example, using Mei and Hime's parametrization (D.-M. Mei, A. Hime; Phys. Rev. D, 73 (2006), p. 053004, http://arxiv.org/pdf/astro-ph/0512125).
-- Michael Kelsey