Determining which grid tiles a straight line passes over on a tilemap

Hello all,

I'm familiar with RayCastAll, which is great for tracking which game objects a line passes through, but I'm struggling to work out the best way to monitor which grid tiles on a tilemap a straight line passes over.

The reason I need to know this is down to working out Line of Sight. If a room has multiple pillars, each of which use a Tilemap Collider, there is a problem where RayCastAll only returns the first pillar it comes across - and ignores the others.

Which is not robust enough. I need to know *all* instances of tilemap walls/pillars along a line.

Is the only option going to be doing a Mathf.FloorToInt on a loop every few dots along the distance from the Ray start to end point? Then checking my tile array for the tile type?

I guess that would work, but it seems a rather messy long-winded solution.