Why is an FFC's Tile Width capped at 4?

[_L_]

I want an FFC that's the size of the screen to use for a translucent fog effect. Now, since all of the tiles for this screen-size fog are arranged contiguously in the tileset (which is NeoFirst's), I could just use one FFC for the entire effect - with a Tile Width of 16, a Tile Height of 11, and its combo having the upper left tile.

But, it seems I can't do that. Why not?

[ShadowTiger]

I wanted to do the very same thing. (You'll notice some oddly arranged Z3 Forest Fog tiles in NeoFirst, somewhere near the NPC sprites and Title Screen Arrangement.)

Besides, what's the difference between the tile width/height variable and the combo width/height? It should be common sense, but they don't quite react relative to what common sense dictates. o.o'

[_L_]

Well, the combo width (called "Effect Width" in zscript.txt) alters the width at which the combo type's effect, ah, still has an effect. For example, a damage FFC with a tile width of 2 and a combo width of 16 would only do damage on the left side. Or so it seems.