Want Prism effect with Mental_ray

[mohitshukla]

Sir/Mam,

While rendering a diamond with Mental_ray, I countered a problem that render only shows the reflection n refraction well as I adjusted but its not showing the prism effect which comes in the real world...
Plz help if I am missing something or there iz something more to be added....

Also m adding some photos
3.jpg & 1.jpg iz diamond by Mental_ray render,
and orig.bmp iz the orignal diamond with prism effect (light scattering).. I need this result with mental_ray...

Plz help

[mohitshukla]

isn't there neone to answer this????/