Generates and Samples Realistic Terrestrial Atmospheres R package skymodelr version 0.3.2 Generates physically based sky environment maps and radiance samples using the spectral Hosek-Wilkie and Prague atmosphere models. Functions write high-dynamic-range 'OpenEXR' domes in latitude-longitude projections, compute per-direction RGB or 55-channel values, and optionally composite time-accurate star fields and moon phases. Features include automatic sun and moon positioning from date, time and location, support for sea-level and high-altitude observers, wide-spectrum coefficients, and multithreaded C++ acceleration for fast, high-resolution output. For model details, see Hosek and Wilkie (2012) <doi:10.1145/2185520.2185591>, Hosek and Wilkie (2013) <doi:10.1109/MCG.2013.18>, Wilkie et al. (2021) <doi:10.1145/3450626.3459758>, and Vevoda et al. (2022) <doi:10.1111/cgf.14677>. Software Depends: R (>= 4.3.0) Imports: Rcpp, swephR, rayvertex (>= 0.14.0), rayimage (>= 0.24.1) LinkingTo: Rcpp, RcppThread, libimath, libopenexr Suggests: testthat (>= 3.0.0), rayrender (>= 0.40.1) Tyler Morgan-Wall <tylermw@gmail.com> Comprehensive R Archive Network (CRAN) Tyler Morgan-Wall [aut, cre, cph], Petr Vevoda [ctb], Charles University [cph], Eric Bruneton [ctb, cph], Lukas Hosek [ctb, cph], Alexander Wilkie [ctb, cph] GPL-3 2026-06-27 application/tgz https://CRAN.R-project.org/package=skymodelr doi:10.32614/CRAN.package.skymodelr