Hi Matt,
I set up the scripts as follows:

in main wdl --

bind <terrain.fx>;
include <terrain.wdl>;

saved the fx part as terrain.fx

created the images

Errors when run:

<ent_terrain=me>
terrain.wdl 53:0 Error (63): Parameter unknown ent_terrain

<bmap_to_mipmap(terrain_detail)>
terrain.wdl 87:0 Error (63): Parameter unknown terrain_detail


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What could be the solution to the ent_terrain=me?

I see definintions of all the other bmaps except terrain_detail. Is this the cause of that error? Do I just create a terrain_detail bitmap?