So, I have another issue. Yay.

Basically, I put a water plane up in the air, like this: http://i221.photobucket.com/albums/dd141/SachioD/ScreenShot385.jpg

And down below things look pretty normal, except that creatures that enter into the area below the water plane will suddenly start to float into the air. But anyways, here it is looking normal: http://i221.photobucket.com/albums/dd141/SachioD/ScreenShot386.jpg

As soon as the PC walks under the water plane, though, they'll suddenly find themselves underwater: http://i221.photobucket.com/albums/dd141/SachioD/ScreenShot387.jpg

How can I prevent this from happening? Some sort of custom bounding box or something? Collision? I haven't a bloody clue how to fix this.

So being "under Water" puts you Underwater? Who knew?

Someone else was having the opposite problem...they couldn't get a water plane to make the area beneath it underwater...

This doesn't bode well for townhouse mods that want to have a rooftop swimming pool...

Maybe embed a roombound in the stone beneath it...might that block the 'underwater" effect?

Or those who want to do fancy landscaping involving something along the lines of creating a plateau, sticking a lake/pond on top of the plateau, and then wanting a tunnel to run through the rock.

Embed a roombound?

i r simple polygon pusher

Wait, you can place water planes? Does this mean I didn't actually have to go through 500 cells in my worldspace and set the water height for rivers by hand?

Yup. Just drag and drop a water plane, then use the gizmos to resize and turn the plane in whatever direction you want. They're called stuff like water1024 and etc.

That gives me an idea.

It was a great idea. Part of a plan so cunning Blackadder would be proud.

Turns out that there is a finite 'depth' to a water plane. The wider it is, the farther down you can swim. I just made mine too wide. Hopefully wont run into any errors from using multiple water planes, but hey, at least this issue is fixed.