What I’m looking for:
I’m currently learning pathfinding for NPC’s. I want them to be able to climb up and (more specifically) down trusses.
What my issue is:
Pathfinding won’t create a path for the NPC to climb down or even just to fall down from a platform.
More explanation:
To be clear, pathfinding will create a path for the NPC to fall down if I allow the NPC to jump, but I don’t want this. I want pathfinding to go down trusses just like it goes up them. I’d appreciate it if someone could tell me how this can be achieved (or if it’s even possible). Many thanks! 
Try turning on AgentCanClimb = true when creating the Agent
If that doesn’t work, try using a PathfindingLink at the location of the truss.
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AgentCanClimb is already true in my situation. The problem is that pathfinding won’t create a path to climb back down after climbing up.
I’ve tried using a PathfindingLink with attachments at the top and bottom of the truss, but it didn’t change anything. They seem to only be used to trigger custom actions, like riding a boat across the water. I still am not sure how to make my NPC climb down the truss, even by creating a custom function to do so…
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Have you tried turning on the NavMesh viewer? I can’t remember the name of the setting, but it’s really helpful if you’re trying to figure out why an NPC isn’t going in the direction it should be going.