Let's say I have three vehicles, which for convenience's sake we'll call a boat, an airship, and a black chocobo. The boat dismounts to plains and doesn't ignore any walls. The airship dismounts to plains and ignores all walls. The black chocobo dismounts to forests and ignores everything but mountains.
In wallmapping terms, I have the water set up as vehicle A and the forests and mountains set up to vehicle B. I have the black chocobo's "override walls" set to "not B" -- that is, he should not ignore mountains' passability. (This is problematic when forest tiles are also shore tiles, but let's ignore that for now.) Here's the thing: "not B" actually causes vehicles to ignore wallmaps except when they are *on* a B tile, not when they would be heading into one. I can't think of how this might be useful, and it also has the "bonus" property of causing the vehicle to get stuck in the mountains if they approach a mountain tile from a plains tile. What I ended up doing is marking mountains as AB and setting the chocobo vehicle to be blocked by A&B, but this for some reason makes it so he can still pass through the mountains, which is almost definitely a legitimate bug (making it one of the oldest easily-fixed bugs ever). Let's talk about vehicles. I think in general they are more than adequate, but they haven't received a lot of love over the years and don't support multiple vehicle types really well. -- "Today is victory over yourself of yesterday; tomorrow is victory over lesser men" -Miyamoto Musashi.
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