You can create your own image to match your scene. I wanted you to be able to see where the edges are though so I am showing it to you using the image you'll be getting with this mod.
You will also be getting one other mods with this, a large prim that can take transparency.
I created it for a need that no longer exists.
This is a simple mod to put a skirt on the MovieStorm terrain.
It is a curved horizon.
You'll probably want to provide your own image
but if you keep the default grass texture the included
image will match close enough for most shots.
Optimal size is 489 which will make the hole just a bit
smaller than the MS terrain.
For some reason I am unable to size it betwen 489 and 501.
501 is just a bit too big.
Centering it might take a
bit of practice but if you need long shots that won't reveal the square terrain
this will be worth the trouble.