Roblox water remover

--[Water remover]--
--[By @_Ntoine31_]-

--Run this code in roblox studio command bar to remove any water of the terrain object--
reg = Region3.new(Vector3.new(-512,-100,-512),Vector3.new(512,100,512))
local Mat,Occ = game.Workspace.Terrain:ReadVoxels(reg,4)

for x,_ in ipairs(Mat)do
    game:GetService("RunService").RenderStepped: wait()
    print(Mat[x])
    for y,_ in ipairs(Mat[x])do
        for z,_ in ipairs(Mat[x][y])do
            if Mat[x][y][z] == Enum.Material.Water then
                Mat[x][y][z] = Enum.Material.Air
            end
        end
    end
end

game.Workspace.Terrain:WriteVoxels(reg,4,Mat,Occ)