How to detect the first layer of a randomly generated map?

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Some things you should note as well before I talk about my proposed solution…

  1. “Wait()” was deprecated recently…it is recommended that you use “task.wait()” instead.
  2. It’s also recommended that you don’t use Instance.new() with the parent argument. The linked topic explains why.

When I was testing out your map generation script…and I noticed…if a block is on top of another one, it will always be 4 studs above it.

You can create another loop that loops through all the parts inside the folder and use Ray Casting to check if there’s a part that’s 4 studs above it. If there’s not a part above it by 4 studs…the script will consider it a top layer.

In this script below…it does just that and for every part considered a top layer…it turns it green (plus is has the fixes I recommended before):

local MAP_SIZE_X   = 64
local MAP_SIZE_Y   = 32
local MAP_SIZE_Z   = 64
local SEED         = 0
local NOISE_SCALE  = 30
local AMPLITUDE    = 20
local BLOCK_SIZE   = 4

if workspace.SEED.Value == 0 then
	SEED = math.random(0, 1000000)
	workspace.SEED.Value = SEED
else
	SEED = workspace.SEED.Value
end
for x = 0, MAP_SIZE_X do
	for z = 0, MAP_SIZE_Z do
		for y = 0, MAP_SIZE_Y do
			local X_NOISE = math.noise(y/NOISE_SCALE, z/NOISE_SCALE, SEED) * AMPLITUDE
			local Y_NOISE = math.noise(x/NOISE_SCALE, z/NOISE_SCALE, SEED) * AMPLITUDE
			local Z_NOISE = math.noise(x/NOISE_SCALE, y/NOISE_SCALE, SEED) * AMPLITUDE
			local DENSITY = X_NOISE + Y_NOISE + Z_NOISE + y
			if DENSITY < 10 and DENSITY > 0 then
				local part = Instance.new("Part")
				part.Parent = workspace.TerrainFolder
				part.Anchored = true
				part.Material = Enum.Material.SmoothPlastic
				part.Size = Vector3.new(BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE)
				part.CFrame = CFrame.new(x*BLOCK_SIZE, y*BLOCK_SIZE, z*BLOCK_SIZE)
			end
		end
	end
	task.wait()
end

for i, v in pairs(workspace.TerrainFolder:GetChildren()) do
	local MapPartParams = RaycastParams.new()
	MapPartParams.FilterDescendantsInstances = {v}
	MapPartParams.FilterType = Enum.RaycastFilterType.Blacklist
	local PartAbove = workspace:Raycast(v.CFrame.p,Vector3.new(0,4,0),MapPartParams)

	if not PartAbove then
		v.Color = Color3.new(0, 1, 0)
	else
		print("Layer detected above the part")
	end
	task.wait()
end

Hope this helps!

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