Is there a reliable way to put one-way collision on part of an autotile?

This is a READ-ONLY snapshot of the Godot Community Forums when TwistedTwigleg was the owner, which is hosted for archival reasons only. The current Godot Community Forums can be found here.

Some links may point to external websites, including the current Godot Community Forums. These websites are not associated with TwistedTwigleg.

Is there a reliable way to put one-way collision on part of an autotile?

trevbot

I'm trying to make some ladders for a 2D platformer. I would like the player to be able to walk/stand on the top of the ladder and pass through from below when climbing.

I was hoping to use an autotile for the ladder so that the bottom, middle and top of the ladder could be easily painted in the editor. But a few problems present themselves:

I'm using two different layers: "platform" and "ladder", and I only want the very top of the ladder to have the "platform" layer (in one direction)
There doesn't seem to be an option to choose one-way collision for a piece of an autotile.

My solution is to just use the "ladder" layer for the autotile (for detecting the ladder when the player is near it) and to manually place a CollisionShape2D with the "platform" layer over the ladder-tops (to have the one-way collision for standing on top of it).

What I'm wondering: is there a means (in script) to check the bitmask of the autotile? I was thinking maybe I could automatically spawn the "ladder top" CollisionShape2D wherever the bitmask meets the requirements of the top part of the autotile.

Of course, if anyone has a better method altogether, I'd love to hear that too. 😃