Irrlicht Engine

Is there a way i can create a terrain, and then add a water node to it and modify the area between the two to make it seem murkier and when actually under the water apply a fog like characteristic to it?

Thanks

Check if the camera is below the water, then increase the fog range

Yeah, when below the water line enable fog, set color and range as appropriate. When you go back above, undo those changes.

is it possible to set fog to an area? for example, also have fog below the water level regardless of whether your above or below it?

Fog is enabled on a per-node basis. The fog doesn't appear like normal real-world fog, it only appears between the camera position and the node that has fog enabled. You should do some experiments with the fog to see if it will do what you want.

Travis

On terrain, the fog sticks to the terrain rather than filling out through it like real fog.

It sucks.

You could try this technique - http://www.nothings.org/computer/vfog/