How to add rivers in Perlin Noise generation?

Help and Feedback Scripting Support
#1

Working on the hexagonal-tile terrain generation aspect of an upcoming project and I’ve came to an issue.

I’m trying to add river-looking structures in but it doesn’t seem to work. I’ve tested with perlin worms by making a path and then painting the hexes blue, but that still doesn’t work.|

Here’s the script:

local MapFolder = game.Workspace.Map



local Relief = 10
local TileExample = game.Workspace.tile
local event = game.ReplicatedStorage.Event

local topX = {0,0,0,0,0}
local topY = {0,0,0,0,0}

local yres = 25
local xres = 25
local val = 0

local function CusNoise(X,Y,seed,seed2)
	return (math.noise(X+seed/100,Y+seed/100)+math.noise(X+seed/100+seed2,Y+seed2/100))/2
end

local function Display(seed,seed2)
	local peaks = {0,0,0,0,0}
	local peakspots: {BasePart} = {}
	for X=1, xres do
		for Y=1, yres do

			local newtile = TileExample:Clone()
			newtile.Anchored = true
			newtile.Position = Vector3.new(X*4-((Y%2)*2),4,Y*3)
			newtile.Parent = MapFolder
			

			val+=1
			if val>150 then
				val = 0
				task.wait(.2)
			end
			local noise = CusNoise(X,Y,seed,seed2)



			for i=1,5 do
				if noise > peaks[i] then
					if i < 5 then
						peaks[i-1]=peaks[i]
						peaks[i] = noise
						peakspots[i]=newtile
						else
					peaks[i]=noise
						peakspots[i]=newtile
						topY[i] = Y
						topX[i] = X
						break
						end
				end
			end
			newtile.Size = Vector3.new(4,2+((noise+.5)*4),4)
			

		end
		
	end

	peakspots[1].Color = Color3.fromRGB(255,255,0)
	peakspots[2].Color = Color3.fromRGB(100,100,100)
	peakspots[3].Color = Color3.fromRGB(150,75,0)
	
	for i, v in peakspots do
		task.wait(1)
		local rparams = RaycastParams.new()
		local getpart = v
		rparams.FilterType = Enum.RaycastFilterType.Blacklist
		rparams.FilterDescendantsInstances = {v}
		while getpart do
			local noise = CusNoise(topX[i],topY[i],seed,seed2)
			local rot = ((noise+.5)*360)-180
			local ray = workspace:Raycast(getpart.Position-Vector3.new(0,getpart.Size.Y-.2,0),Vector3.new(0,rot,0),rparams)
			if not ray then getpart = nil else 			
				getpart = ray.Instance
				getpart.Color = Color3.fromRGB(0,0,255)end 
	
		end
	end
end

event.Event:Connect(function()
	MapFolder:ClearAllChildren()
	task.wait(.3)
	Display(math.random(1,200),math.random(1,200))
end)
#2

Bumping as I’ve still not found a solution.

If anyone got some ideas/sources on adding Rivers to a perlin-noise generated map then please link it here!

#3

bumping again after over 10m because i still havent found a solution

#4

You sure this is right? …

also

local function AddRivers(seed, seed2)
  
    local riverPaths = {}
    for X = 1, xres do
        for Y = 1, yres do
            local noise = CusNoise(X, Y, seed, seed2)
            if noise < 0.2 then
                table.insert(riverPaths, Vector3.new(X * 4 - ((Y % 2) * 2), 0, Y * 3))
            end
        end
    end

    for _, riverPos in ipairs(riverPaths) do
        for _, tile in ipairs(workspace:FindPartsInRegion3(MapFolder.Position + riverPos - Vector3.new(2, 0, 2), MapFolder.Position + riverPos + Vector3.new(2, 0, 2), nil)) do
            tile.Size = Vector3.new(4, 1, 4)  -- Lower the height for riverbed
            tile.Color = Color3.fromRGB(0, 0, 255)  -- Set water color
        end
    end
end

and lower in the script

    Display(math.random(1, 200), math.random(1, 200))
    AddRivers(math.random(1, 200), math.random(1, 200))

there is no way to test this so … that’s my guess.