Setting line renderer size to raycast hit length

I'm attempting to set the index 1 y value of the line renderer to the length of a raycast hit in a top down setting. The value does change as my character rotates and moves around but it is not the length of the raycast at all. The values change but the line renderer still passes through walls, objects, enemies ,etc. I must be missing a better way to achieve this so any help would be greatly appreciated.