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c3dr

ANALYTICS
Velocity0.0

Read and write C3D motion capture data in R. Contribute to ropensci/c3dr development by creating an account on GitHub.

github.com/ropensci/c3dr ↗

A biomechanics C3D reader graduated through rOpenSci review to CRAN, then learned to write force plates.

biomechanicsmotion-captureropenscir-packagefile-iocran
◆Current state
c3dr reads and writes C3D motion-capture files in R, wrapping the EZC3D library. It cleared rOpenSci peer review and moved into the rOpenSci organisation in April 2025, reached CRAN a month later, and shipped force-platform export in c3d_write() in August. Releases are close together and each one has a clear single purpose.
◆Where it's heading
The package is filling in the write side of the read/write pair. Reading was in place from the start; 0.2.0 extends c3d_write() to force-platform data on a direct user request, and the accompanying work preserves matrix structure on import and tracks upstream EZC3D changes. The review-era releases hardened validation and error messages, so the current cycle can be spent on capability rather than polish.
◆Prediction
Expect further coverage of C3D block types in the writer and continued tracking of EZC3D releases; the changelog gives no signal of analysis features beyond file I/O.

◆Recent moves

  1. 11mo ago

    c3d_write() gains force platform export

    Force platform data can now be written out, not just read, closing a gap a user had asked for and tested. Imported parameters also keep their matrix structure, and the package tracks the latest EZC3D changes.

    View source ↗
  2. 1y ago

    gcc 15 compilation fix

    A single compilation fix for gcc 15. Toolchain maintenance on the C++ layer, invisible to anyone whose build already worked.

    View source ↗
  3. 1y ago

    First CRAN release

    The package lands on CRAN with minor submission fixes, a month after the rOpenSci transfer. Distribution, rather than code, is what changed here.

    View source ↗
  4. 1y ago

    rOpenSci review lands; repo moves to rOpenSci

    Peer review brings input validation across all functions, better error messages, a format.c3d() method and a fixed silent failure in c3d_write() when the target directory was missing. The repository transfer to rOpenSci is what set up the CRAN release that followed.

    View source ↗