Terrain

local chunks = {}
local player = game.Players.LocalPlayer
local char = player.Character
local torso = char:WaitForChild("Torso")

local baseHeight = 10 -- The main height factor for the terrain.
local chunkScale = 3 -- The grid scale for terrain generation. Should be kept relatively low if used in real-time.
local renderDist = 120 -- The length/width of chunks in voxels that should be around the player at all times
local xScale = 90 -- How much we should strech the X scale of the generation noise
local zScale = 90 -- How much we should strech the Z scale of the generation noise

local generationSeed = math.random() -- Seed for determining the main height map of the terrain.
local mountainSeed = math.random() -- Seed for determining if we should make mountains.

function chunkExists(chunkX,chunkZ)
	if not chunks[chunkX] then
		chunks[chunkX] = {}
	end
	return chunks[chunkX][chunkZ]
end

function mountLayer(x,heightY,z,material)
	local x = math.floor(x/4)
	local z = math.floor(z/4)
	for y = -baseHeight,heightY do
		workspace.Terrain:SetCell(x,y,z,material,0,0)
	end
end

function makeChunk(chunkX,chunkZ)
	local rootPos = Vector3.new(chunkX*chunkScale,0,chunkZ*chunkScale)
	chunks[chunkX][chunkZ] = true -- Acknowledge the chunk's existance.
	for x = 0,chunkScale-1 do
		for z = 0,chunkScale-1 do
			local cx = (chunkX*chunkScale) + x
			local cz = (chunkZ*chunkScale) + z
			local noise = math.noise(generationSeed,cx/xScale,cz/zScale)
			local material = noise < 0 and 1 or 4
			local cy = noise*baseHeight*material
			mountLayer(cx,cy,cz,material)
		end
	end
end

while true do
	local chunkX,chunkZ = math.floor(torso.Position.X/chunkScale),math.floor(torso.Position.Z/chunkScale)
	local range = math.max(1,renderDist/chunkScale)
	for x = -range,range do
		for z = -range,range do
			if not (x == 0 and z == 0) then
				local cx,cz = chunkX + x,chunkZ + z
				if not chunkExists(cx,cz) then
					makeChunk(cx,cz)
				end
			end
		end
	end
	wait()
end
--------------------------------------------------
local region = Region3.new(Vector3.new(-1250,0,-1250), Vector3.new(1250,18,1250))
region = region:ExpandToGrid(4)
game.Workspace.Terrain:FillRegion(region, 4, Enum.Material.Water)
--------------------------------------------------