Do you have an example?
I don't really know how to script but if you ever load up GSF nightmare when you go into the closet you die by a trigger event. If someone can figure that out for me I'll be set.
Behind the mountain is a seaside cliff, you just can't see it because of the picture.
Um I thought sand close to water is coarse and sand away from the water is fine?
I don't have an example on hand, but I'm sure you can picture a fairly homogeneous texture. Basically a single color with noise applied to it. No big splotches of color.
I used kill triggers in the original Planets map; they were a pain to setup. A far more flexible, fool-proof method would be a script as described before. It also means you need not kill players outside of a mini-game. It should be fairly trivial to make, I'm sure a distance finding function already exists in the engine.
In my experience the finest sand is closest to the water. YMMV.