Chunk Generation Help

[MalAllie]

1. What do you want to achieve?
   I wanted to create voxel terrain generation. For instance, minecraft terrain generation. I was following a few tutorials.

Creating Procedural Mountains: A Fractal Noise Tutorial

Creating Procedural Mountains This tutorial will cover generating procedural terrain using various types of noise as heightmaps. We will blend noise together to create convincing "Minecraft" style terrain. I will give you code snippets, diagrams and explanations so that hopefully you can recreate this yourself, and explore other types of terrain generation in the future. The End Goal Here is a video I posted to my twitter showcasing the terrain you will be able to create for yourself by the end…

How to make Voxel Terrain In Roblox Studio #2 | Layers & Chunks!

2. What is the issue?
The issue is that the chunk doesn’t spawn near the camera and that there are holes in my terrain. (I put my camera where the character is, before the chunk generated)

3. What solutions have you tried so far?
   I tried looking on the devforum for solutions, but most of them were generating chunks at spawn or did not work out.

local NoiseUtil = {}

type int = number

function NoiseUtil.Generate2DFractalNoise(X: int, Y: int, Octaves: int, Lacunarity: int, Persistence: int, Scale: int, Seed: int)
	local Value = 0
	
	local x1 = X
	local y1 = Y
	
	local Amplitude = 1
	
	for i = 1, Octaves, 1 do
		Value += math.abs(math.noise(x1 / Scale, y1 / Scale, Seed)) * Amplitude
		
		y1 *= Lacunarity
		x1 *= Lacunarity
		
		Amplitude *= Persistence
	end
	
	Value = Value ^ 2
	
	return math.clamp(Value, -1, 1)
end

local MAP_SIZE							= 250.0
local MAP_SCALE							= MAP_SIZE/2.0

local NOISE_SCALE						= 50.0
local HEIGHT_SCALE						= 50.0
local OCTAVES							= 4.0
local LACUNARITY						= 3.0
local PERSISTENCE						= 0.35

local BLOCK_SIZE						= 3.0
local CHUNK_SIZE						= 30.0

local NUMBER_OF_CHUNKS					= math.ceil(MAP_SCALE/CHUNK_SIZE)

local ChunkPositionX					= 1
local ChunkPositionZ					= 1

local function updateChunkPositionVariables()
	local camPos = Camera.CFrame.Position
	
	ChunkPositionX = camPos.X // CHUNK_SIZE
	ChunkPositionZ = camPos.Z // CHUNK_SIZE 
end

local function generateBlock(x, y, z, color, chunkfolder)
	local grass = Template:Clone()
	local height = grass.PrimaryPart.Size.Y
	
	local realx = (x // BLOCK_SIZE) * BLOCK_SIZE
	local realY = (math.floor(y) * BLOCK_SIZE)
	local realz = (z // BLOCK_SIZE) * BLOCK_SIZE
	
	grass:PivotTo(CFrame.new(x, realY, z))
	grass.PrimaryPart.BrickColor = BrickColor.Green()
	grass.PrimaryPart.TopSurface = Enum.SurfaceType.Smooth
	grass.PrimaryPart.BottomSurface = Enum.SurfaceType.Smooth
	grass.PrimaryPart.Color = color
	grass.Parent = chunkfolder
	
	return grass
end

local function generateASingleChunk(chunkX: number, chunkZ: number)
	local PlayerPos = Camera.CFrame.Position
	
	for x = ChunkPositionX, ChunkPositionX + CHUNK_SIZE do
		for z = ChunkPositionZ, ChunkPositionZ + CHUNK_SIZE do
			local realX = (chunkX - 1) * CHUNK_SIZE + x --The problem might be here
			local realZ = (chunkZ - 1) * CHUNK_SIZE + z

			local height2d = NoiseUtil.Generate2DFractalNoise(realX, realZ,
				OCTAVES,
				LACUNARITY,
				PERSISTENCE,
				NOISE_SCALE,
				SEED
			) * HEIGHT_SCALE

			generateBlock(realX * BLOCK_SIZE, height2d, realZ * BLOCK_SIZE, Color3.new(1,1,1), WorldFolder)
		end
	end
end

task.wait(4)
updateChunkPositionVariables()
generateASingleChunk(ChunkPositionX, ChunkPositionZ)

[Katrist]

Are you generating the chunk on the client?

[MalAllie]

Yes I’m generating the chunks on the client for testing

[MalAllie]

Ok so after a few tests, I noticed that the chunks overlap each other. I updated the code to fix this problem, but the problem isnt fixed yet.

local function generateASingleChunk(chunkX: number, chunkZ: number)
	local PlayerPos = Camera.CFrame.Position
	
	local chunkColor = Color3.new(math.random(1, 255), math.random(1, 255), math.random(1, 255))
	
	local chunkFolder = Instance.new("Folder", WorldFolder)
	chunkFolder.Name = "Chunk_".. chunkX .."_".. chunkZ
	
	for x = 1, CHUNK_SIZE do
		for z = 1, CHUNK_SIZE do
			local realX = (chunkX - 1) * (CHUNK_SIZE) + x
			local realZ = (chunkZ - 1) * (CHUNK_SIZE) + z

			local height2d = NoiseUtil.Generate2DFractalNoise(realX, realZ,
				OCTAVES,
				LACUNARITY,
				PERSISTENCE,
				NOISE_SCALE,
				SEED
			) * HEIGHT_SCALE

			local color = getColor(realX, realZ, height2d)

			generateBlock(realX * BLOCK_SIZE, height2d, realZ * BLOCK_SIZE, chunkColor, chunkFolder)
		end
	end
end

[MalAllie]

After a few hours of trials and errors, I finally found the solution!! I had to change these lines of code.

local function updateChunkPositionVariables()
	local camPos = Camera.CFrame.Position
	
	ChunkPositionX = math.floor(camPos.X / (CHUNK_SIZE * BLOCK_SIZE)) + 1
	ChunkPositionZ = math.floor(camPos.Z / (CHUNK_SIZE * BLOCK_SIZE)) + 1
end