You can't do 2 layers of footprint on a doodad, so it means it can't recognize both the surface of the bridge and the surface under the bridge. You will either have units walking on ground that move instantly on the bridge, or units on the bridge who fall down on ground. The issue exists since Warcraft 3, and unless we could someday have 2 layers of footprint in a doodad it will never work properly. Maybe you can fake it, but it will be bugged anyway.
Is there any solution to create a walkable plattform, where units can pass trough under it too?
No, there is not.
This topic was already discussed at least 4 or 5 times (you should have done a search before posting) and, as for the Warcraft 3 editor, you can't make units pass under AND over of a bridge. Bridges are objects, objects collide with units, and the only way to make sure a unit does not collide with a bridge is to edit the footprint. But it doesn't allow to use depth, so the walkable path is in 2D. No matter how you do it, it will never work fine.
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@michaelknives: Go
You can't do 2 layers of footprint on a doodad, so it means it can't recognize both the surface of the bridge and the surface under the bridge. You will either have units walking on ground that move instantly on the bridge, or units on the bridge who fall down on ground. The issue exists since Warcraft 3, and unless we could someday have 2 layers of footprint in a doodad it will never work properly. Maybe you can fake it, but it will be bugged anyway.
No, there is not. This topic was already discussed at least 4 or 5 times (you should have done a search before posting) and, as for the Warcraft 3 editor, you can't make units pass under AND over of a bridge. Bridges are objects, objects collide with units, and the only way to make sure a unit does not collide with a bridge is to edit the footprint. But it doesn't allow to use depth, so the walkable path is in 2D. No matter how you do it, it will never work fine.