Function floor_ground 

pub fn floor_ground(
    floors: &Floors,
    size: usize,
    terrain: &HeightGrid<'_>,
    cell: i32,
) -> [f32; 3]

The ground at a cell’s centre: on a bridge’s floor where one covers the cell above the terrain, else on the terrain.

Original: FUN_1400a48b0 with param_4 0, as nearly every caller passes.