AbstractMUSCAT is a Monte Carlo code for numerical simulation of Multiple Scattering. Only the general restrictive assumptions of the steady‐state, scalar radiative transfer equation are required, hence the MUSCAT code can deal with a broad field of applications. The algorithm follows the physical phenomena as closely as possible and realistic 3‐D problems can be handled without geometric simplifications. Special care has been devoted to the analysis and validation of the pseudo‐random generator subroutine. Global validations of the code in 1‐D and 2‐D geometries have been successfully carried out. An example of application is reported concerning 3‐D studies of visibility in fo