Transparent walls for Terrain based maps

I'd like to suggest a wall type that is transparent. That is, it blocks token vision when converted into a vtt map but still shows the cool sculpted walls.

This would eliminate the need to have visible walls. that don't match the cave architecture.

This would make @Nikolai 's Cave mapping tricks amazing.

The end result I'd like to see is being able to sculpt walls that don't wreck token vision in VTT maps.