I have a spider unit in my game that can climb walls. But he still needs pathfinding in order to determine the cost of climbing tall walls vs. going around. Also, doors may be closed so he can’t get into buildings. Are there any examples or resources on how I would approach this problem?
Hi
There is not much information unfortunately.
You might be able to use links (see NodeLink2 component) to do this, but I’m afraid it isn’t a particularly well documented area. 
Thanks for the response. To clarify, would you say that this is an impossible or difficult task? Or one that is totally doable, but there are just no examples on how to do it? If the latter, do you have any suggestions on how to do this?
Hi
The trickiest part is to get the agent movement to work well and integrate with animations and such.
There is an example scene using links in the Recast Example Scene 1 (or possibly 2, I cannot remember). It’s doable, but it will require some work to get it to look right.