How to use raycast to get position before intersection

[LC Creations]

So, I know that in minetest you can use raycast. What know is that raycast returns false if between the two positions you provide there is a node that cuts off the players further visibility. I want to get the node pos before the other node that cuts off the players visibility so I can manipulate that position. I'm planning on getting all objects in a radius in that position.

[runs]

This is easy: take always in the loop the old previous node.

Look at my rcbows mod to get the idea. I get the old_pos there.