Perlin Noise Randomization

Help and Feedback Scripting Support
#1

Hello! recently I’ve been working a lot on Perlin Noise Terrain Generation however I’ve run into a issue with the randomizer I’m using this code block right here

local X = 225
local Z = 225
local randomNum = math.random(15, 200) --Defines the stretch of the terrain
local waterHeight = math.random(-35, -20) --Defines the height of the water
local sandHeight = math.random(waterHeight+2, waterHeight+4) --This determines how much extra sand will appear
local treeRarity = math.random(75, 100) --The higher the number the more rare trees become
-----------------------------------------------

local Seed = math.random(randomNum-20, randomNum+20)
local randomNumTwo = math.random(randomNum-10, randomNum+10)
local grid = {}

for x = 1, X do
	grid[x] = {}
	for z = 1, Z do
		grid[x][z] = math.noise(x/randomNum, z/randomNumTwo) --Issue Here
	end
end

and though it will use Perlin Noise Generation it won’t appear random. Any help is appreciated!

#2

The density range is so vast that you get bigger ravines than we see in minecraft. Try uniforming that value with a linear function.

#3

Well to start though it would work I’m trying to make my code custom I just want to know how I could make it more random than it is.

#4

Basically we need to solve the equation of the alpha of the linear interpolation function.

#5

Uhhhh. Not a clue what you just said

#6

Say we have function

f(a,b,t) = a+(b-a)*t

what this means is our alpha value is equivalant to the parameters we pass for f(a,b,t) now let’s say we know what a and b and f(a,b,t) is. How could we find what t is? We would need to solve the equation for t. Now let’s start with a more simple example, lets say we have

f(x) = 2x

we know what f(x) is but we don’t know what value we passed, say f(x) was 4. We can rewrite this as

4=2x

and then we can simply solve the equation by moving the variable x by using a system of equation to get 4/2 = x
we can rephrase this as

h(v) = v/2
#7

Wouldn’t this always generate the same terrain?

#8

f(a,b,t) is the value we got from that math.random() function

#9

Which one? I have three math.random functions.

#10

You would apply that for each density (math.random()) function

#11

[quote=“SloppyBanana225, post:1, topic:1056012”]

local X = 225
local Z = 225
local randomNum = math.random(15, 200) --Defines the stretch of the terrain
local waterHeight = math.random(-35, -20) --Defines the height of the water
local sandHeight = math.random(waterHeight+2, waterHeight+4) --This determines how much extra sand will appear
local treeRarity = math.random(75, 100) --The higher the number the more rare trees become
-----------------------------------------------

local Seed = math.random(randomNum-20, randomNum+20)
local randomNumTwo = math.random(randomNum-10, randomNum+10)
local grid = {}

for x = 1, X do
	grid[x] = {}
	for z = 1, Z do
		grid[x][z] = math.noise(x/f(a,b,t), z/f(a,b,t) --Issue Here
	end
end

is this what it would look like?

#12

What I was describing to you earlier was just latex. You gotta code your lerp alpha function bro. Or just use my Math++ bound() function :wink:

#13

Ok, yeah I’m clueless I’ll just mark you as solution.

#14

You described it to me well I just don’t understand it, though you solved it so, heh.

#15

Try reading this Solving Equations

#16

in case anyone else is struggling this worked for me

local seed = math.random() * 1000
local res = 100
local freq = 3
local amp = 10
local noise = math.noise(
	(x+seed)/res * freq,
	(y+seed)/res * freq
) * amp