Introduced in 2001, the Fx Tree was a new image compositing module in XSI that was based in part on the discontinued Media Illusion
Fx Tree
Media Illusion
eX-SI
ICE, scripting, and other tech stuff about Softimage aka XSI
Introduced in 2001, the Fx Tree was a new image compositing module in XSI that was based in part on the discontinued Media Illusion
eX-SI 
i remember that from xsibase