Terrain scene manager

If I use terrain scene manager to manage my terrain generate from an heightmap, instead of a mesh, how can I add a depth material technique to it?

Hydrax 0.4 demo uses the default ogre terrain scene manager, just copy the code from the demo;)

sorry, but I can't run the demo and I haven't look to it. I'll try ^^

ps: I'm looking for making texture splatting with terrain scene manager, I think I had to use material but I don't know well how use it. Can you suggest something? And another question how hydrax work with splatted texture? I think it shouldn't have any problem.