If by 'this' you mean BRL-CAD in general, then yes.. the history of the project and extent of the capabilities runs rather deep with a lot of project contributors over the years. However, I believe what brlcad.com has is a screenshot of Archer and if that is what you're referring to, then no there has not really been many people working with Archer -- at least not yet. There hasn't been much activity or community involvement with Archer nor major developement activity since it's inclusion in part because it's not been pressed/announced to the commmunity as much as it should be, and in part because it still requires additional development before it'll be ready for production modeling use. That really is a shame as it is a nice interface and answers a lot of the complaints some users have over MGED's GUI, BRL-CAD's older solid modeling interface. It wraps much of the same core BRL-CAD library functionality as MGED, but with an improved interface. Archer was developed as part of a larger SBIR-funded project at SURVICE Engineering to make a more immediately familiar/intuitive solid modeling interface over BRL-CAD's MGED solid modeler while still leveraging the existing geometry kernel in BRL-CAD. SURVICE donated the code with no expectations to the BRL-CAD project as open source with the hope of it being a good start for the community to get involved with and improve upon. If anyone is interested in picking up and/or contributing to the development of Archer, they are more than welcome to do so. It's a better interface with a lot of potential. Similarly, there is additional work going on with the BRL-CAD core libraries and API facilities for more robust geoemtry support services that would benefit from involvement if any developers are interested. Cheers! Sean BRL-CAD Open Source http://brlcad.org On Fri, 1 Dec 2006, Marc Britten wrote: > Has anyone worked with this much? Looks pretty impressive in the one > screenshot if found on http://brlcad.com