So basically I want to make a swimmer move around underwater obstacles. However, PathfindingService only seems to work when there's a solid surface to move on. Is there a way to either have PathfindingService ignore water and move in 3D, or take swimming in water into account?
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How do I make PathfindingService work in 3D?
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You can't
It's just not implemented in that way. What you can do is you can implement your own by having your own nodes to avoid or follow. This requires a bit of work on your end, but it will actually ultimately be a bit faster and a ton more flexible.
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OK, thanks! I guess it's time to look into using Dijkstra's algorithm.