Add collision to only the borders of a node, allowing a sprite to move freely inside of the node

Question

I am building a game in which I "dig" underground to allow a ball to fall through. Is it possible to allow this ball collide with the borders of the node whilst inside of it. Based on the image below, my goal is to draw a tunnel with touchMoved and let the ball fall in while colliding with the surface of the tunnel.

Answer 1

I think you should should use the 2 sides of the tunnel to define SKShapeNodes so that when the ball is in the tunnel, it isn't inside a node.

In your example picture, you would have 2 nodes - one for each of the black areas.

Then set up your collision parameters such that the ball cannot pass through the shapes