Great! But I'm new to the whole shader thing; could you also give me a simple action to use it on a model?

Hi,
to implement the code by cbw just try this
Code:

---

 
material mat_water
{
effect = ""; // the shader code goes here
}

action act_waterMdl
{
my.material = mat_water;
//and so on
} 

---

As far as I'm concerned this should work well, if else please let me know...