Math.noise tree support

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1

I was creating a terrain generator today and I could not figure out how to make there be trees on the grass and snow areas. Here is my current script that generates the land:

local Seed = 1002
local freq = 150
local Smoothness = 200
local Size = 1000
local PartSize = 5
	for X = 0,Size,PartSize do -- X Loop
		    for Z = 0,Size, PartSize do -- Z Loop
					
			      
			        local p = Instance.new("Part",workspace.Map)
					p.Anchored = true
					p.Shape = Enum.PartType.Block
			        p.Size = Vector3.new(PartSize, PartSize, PartSize)
			 	

		       
		       local Y = math.noise(X/Smoothness,Z/Smoothness,Seed) * freq
		 
		       
		p.CFrame = CFrame.new(X,Y,Z)
		
		if p.Position.Y <= workspace.Terrain1.Position.Y + 5 then
			p.Material = Enum.Material.Sand
			p.BrickColor = BrickColor.new("Cool yellow")
		elseif p.Position.Y >= workspace.Terrain2.Position.Y then
			p.Material = Enum.Material.Sand
			p.BrickColor = BrickColor.new("White")
		elseif p.Position.Y >= workspace.Terrain1.Position.Y then
			p.Material = Enum.Material.Grass
			p.BrickColor = BrickColor.new("Dark green")
		end
		    end
		   
		    wait()
		end

Thanks! :grinning:

1 Like
2

One pretty simple way is to

        elseif p.Position.Y >= workspace.Terrain1.Position.Y then
			p.Material = Enum.Material.Grass
			p.BrickColor = BrickColor.new("Dark green")

            if math.random() < 0.1 then
                --Clone a tree model, place it at X Y Z coordinates
            end
		end
1 Like
3

You can do what @ThanksRoBama said, or you can use another noise layer:

elseif p.Position.Y >= workspace.Terrain1.Position.Y then
	p.Material = Enum.Material.Grass
	p.BrickColor = BrickColor.new("Dark green")

    local treeDens = math.noise(X/Smoothness,Z/Smoothness,math.floor(Seed / 4) + 3) 

    if treeDens < 0.00625 and treeDens > -0.00625 then
    --generate the tree
    end

end

The difference math.random() between math.noise() method is:

math.random() returns a random value, which means if you generated the terrain over and over with same seed, the trees will be positioned at different positions from first terrain generation.

However, math.noise() will return the same number at any time if you didn’t changed values inside of it, which meains if you generated the terrain over and over with same seed, the trees will be positioned at same positions from first terrain generation.

2 Likes
4

This creates trees, but the trees come in very long rows like this:

RobloxScreenShot20210219_094537794
RobloxScreenShot20210219_094537794890×476 232 KB

Do you know why?

6

Can you provide the current code that you’re using?

So, I realized that I gave the sample code from my terrain generator, which it uses multiple layers of noise, so the final code should look like this:

local Seed = 1002
local freq = 150
local Smoothness = 200
local treeRate = 20
local Size = 1000
local PartSize = 5
for X = 0,Size,PartSize do -- X Loop
	for Z = 0,Size, PartSize do -- Z Loop


		local p = Instance.new("Part",workspace.Map)
		p.Anchored = true
		p.Shape = Enum.PartType.Block
		p.Size = Vector3.new(PartSize, PartSize, PartSize)



		local Y = math.noise(X/Smoothness,Z/Smoothness,Seed) * freq


		p.CFrame = CFrame.new(X,Y,Z)

		if p.Position.Y <= workspace.Terrain1.Position.Y + 5 then
			p.Material = Enum.Material.Sand
			p.BrickColor = BrickColor.new("Cool yellow")
		elseif p.Position.Y >= workspace.Terrain2.Position.Y then
			p.Material = Enum.Material.Sand
			p.BrickColor = BrickColor.new("White")
		elseif p.Position.Y >= workspace.Terrain1.Position.Y then
			p.Material = Enum.Material.Grass
			p.BrickColor = BrickColor.new("Dark green")
			
			local treeDens = (math.noise(X/treeRate,Z/treeRate,math.floor(Seed / 4) + 3) * Smoothness)  / Smoothness
			
			if treeDens < 0.00625 and treeDens > -0.00625 then
                -- you should change this lines, because this part generates sticks instead of generating tree
				local p = Instance.new("Part",workspace.Map) 
				p.Anchored = true
				p.Shape = Enum.PartType.Block
				p.Size = Vector3.new(2, PartSize, 2)
				p.CFrame = CFrame.new(X,Y + 6,Z)
			end
			
		end
	end

	wait()
end

treeRate is a value which sets tree generation rate. If value is high (ex. 50 or 100) terrain generator generates low amount of trees. If the value is low (ex, 10 or 20) terrain generator generates high amount of trees.

You have to tweak the code for getting better results, good luck!