Mental ray for Maya 4.5 is free for download at AliasWavefront.com

I don't know how to simulate... but, maybe others have some ideas

edit:
I guess you can use Maya 4.5 Complete with mental ray, but I'm not crossing my heart and hoping to die.

edit2:
The site says it is free to download for both Complete and Unlimited. Crossing my heart and hoping to die.