Aparently BMRT is dead!(not that I care):
A sad thing is that BMRT is no more, as part of an out-of-court settlement
From an article on raytraicing: http://www.acm.org/tog/resources/RTNews/html/rtnv15n1.html
Well, actually this is old news…
They explain everything on their page:
http://www.exluna.com
But fortunatelly there are other tools like BMRT, such as:
AQSIS, 3Delight, OpenRender, Freeman, Mirage3D… etc.
Spyros.