Hola!
Ya está disponible el programa RenderPal 2004 Workstation "Free" para renderizar escenas de XSI:
"Welcome to RenderPal.com, home of RenderPal 2004, the professional render management system for a high number of renderers and compositing tools, including Maya, Mental Ray, Softimage XSI, 3d Studio Max, Lightwave, Apple Shake, Adobe After Effects, Realflow and many more."
http://www.renderpal.com/index.phpLa versión Server si es de pago y hay una versión trial para bajarse.
Vamos a ver que tal vá!