I have recently made some modifications to the C3D.ORG website to give it a responsive design that works better on both desktop and mobile devices. I am now working to bring the C3D format documentation and on-line help pages up to date to describe modern C3D usage. As part of the website update I requested and received sample C3D files from several companies in the biomechanics world and after looking at the contents of the C3D files that I received, I think that it's time to update the C3D format definition and documentation.

My plan is to document two simple extensions to the C3D format that will be completely transparent to any existing application that complies with the C3D format definition. The new extensions and an updated C3D manual will be available on-line in about a month once the manual is complete.

The extensions that I am working on define a small modification to the C3D standard that will improve the ability to generate clean C3D files containing accurate data that is easily stored, shared, and accessed. I plan to document a method of storing multiple parameter sections and additional data sections that can store processed data in the C3D format efficiently without disturbing the existing data, allowing manufacturers to transition to the new format definition if they wish, without causing any compatibility issues for current C3D users.

Because the new c3d.org web site is cookie-free, does not track any visitors, or record any user's access to maintain the C3D format as vendor neutral, I am posting this announcement on Biomch-L to alert anyone working with the C3D format about some proposed changes. I would welcome any questions or comments.