Disabling caustics for certain materials

Hi, how can I disable caustics for certain materials? I have a "selection indicator" for my players, which is a mostly transparent plane, and it looks funny when it has caustics applied to it underwater. I would like the caustics instead to go straight to the ground.

Just create a black-coloured technique in your material with "HydraxDepth" scheme name

Great, thanks!

To anyone having issues with transparency, check out this thread: http://www.ogre3d.org/addonforums/viewtopic.php?f=20&t=9235