how to create light-blockers in Maya-Mental ray ?

[ranavimr]

Hi,

I was hopping someone might know if there is a possibility to create light blocker like in Renderman but using Maya and Mentalray.

a blocker in renderman is a sphere or a box that influence the scene lights intensity that goes through it. so any geometry inside the blocker can get more/less light depended on the blocker settings.

does it exist ? or should I write a mental-ray shader to do it ? (is it even possible in MR ?)

Any help will be very appreciated

Thanks !
Ran