preload_mode example, as I remember all 3 included scripts resulted in crash: http://www.mediafire.com/?r6318kdrf11zer3 (wmb-s are compiled from my editor by wwmp2wmb.exe)

I forgot to include, but the messy mirror water can be checked if simply replacing in void main() level load(levelname_str) by:
level_load(NULL);
ent_create("water4.hmp",nullvector,Map_Water_Action);
ent_create("003drygrass_1skin.hmp",nullvector,Map_Terrain_Action);

and removing this loop (btu not essential):
me = ent_next(NULL);
while (me) { ... }

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the terrain hull example is not easy, as it is within my editor, and I cannot make a simple representation fast, but I'll try to make a simplified demo...