ConnectingPoint

Which direction we can create the pipe in. If null, the pipe can be in any direction.

Has something changed (eg a block being removed) that means we can't use this point any more?

Where the connecting point physically exists relative to its parent block

Block the point is tied to

Perform logic to make this one of the points of a new pipe, for example by splitting an existing pipe or placing a new connection point. This should always yield a new connection point which we can connect the pipe to.