Home page is at http://www.tls.cena.fr/~mertz/index_e.html Mail: mertz(at)cena.fr
I rather use perl than tcl.
However in my team, we developped TkZinc a tcl widget also known as Zinc, a Canvas suporting openGL and many new interesting functions:
http::/www.openatc.org/zinc which should be worth for the tcl community.