To cite package ‘rasterShade’ in publications use:

  Caha J (2018). _rasterShade: Wrapper around rayshader package_. R
  package version 0.6.0, <https://github.com/jancaha/rastershade>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {rasterShade: Wrapper around rayshader package},
    author = {Jan Caha},
    year = {2018},
    note = {R package version 0.6.0},
    url = {https://github.com/jancaha/rastershade},
  }