Reynolds-Style Boids and Swarm Simulation R package boids4R version 0.3.1 Provides deterministic two- and three-dimensional boids and swarm simulations for R. The package implements Reynolds-style separation, alignment, and cohesion rules with optional obstacles, attractors, predators, species parameters, and reproducible frame export. Simulation state is renderer-neutral; optional adapters can hand frame data to visualization packages such as 'ggWebGL'. The model follows Reynolds (1987) <doi:10.1145/37402.37406>. Software Depends: R (>= 4.1) Imports: Rcpp LinkingTo: Rcpp Suggests: ggWebGL (>= 0.4.0), htmlwidgets, knitr, pkgdown, rmarkdown, testthat (>= 3.0.0) Frederic Bertrand <frederic.bertrand@lecnam.net> Comprehensive R Archive Network (CRAN) Frederic Bertrand [cre, aut] (ORCID: <https://orcid.org/0000-0002-0837-8281>) GPL-3 2026-05-13 application/tgz https://CRAN.R-project.org/package=boids4R doi:10.32614/CRAN.package.boids4R