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So what's new here? We decided a while ago that body piles in UEBS2 should be truly infinite. This means, entire cities could be buried with bodies which could have an impact on the landscape and battlefield itself. But, there was a problem. When bodies reached heights of ledges or rooftops, AI would ignore this and still see them as obstacles with our current pathfinding system.
So we fixed it! In this video, we demonstrate how the AI actually use their own bodies to form a navigational bridge to get to their enemies. This event happens naturally since the AI are intelligent enough to go to the shortest ledge to get as close as possible to their enemies. In some scenario's bodies would pile slowly and eventually there would be access to the campers on the top. However, the zombies have a specific ability where they suicide on contact with the wall they need to traverse, allowing them to build a a body ramp quickly to their target.