arrrgh! Thanks for clearing this — This is my prototype.
I´v already a system using an invisible sprite created on top of the tiles at runtime (that's what turns the orange cones to gray, while the LOS plug turns opacity to 100%) I will try and extend it this way.
Each tile as different elevation and depending on the tile my astronaut stands it will block LOS if higher.
If using colliders this will also prevent the Astronaut to move smoothly in to a solid tile (theres is a jump while the code re-cycles)
I´m also planing to add other LOS blocking features (vegetation etc..) and on top of that have also some kind of LOfire. So using colliders for LOS is not an option.