How to generate random shaped island with perlin noise

[ApparentlyJames (jamesisbored)]

So I have the basics of generating the island, but it’s completely square and has unfinished edges. I was wondering if it’s possible and then how would I make it generate as a random shape, something like this:

Any help is appreciated!

[Artzified]

I have somewhat made something similar:

Procedurally generated hexagonal-based map, i guess

a procedurally generated hexagonal map. [200x200, uses fractional brownian motion (fbm)] whats your thought of this? i feel like theres a lot of room for improvement

terrain parameters

<a name="octaves-2" class="anchor" href="#octaves-2"></a>Octaves how many layers you are putting together. (value = 4) <a name="amplitude-3" class="anchor" href="#amplitude-3"></a>Amplitude how high the terrain shou…

which uses FBM and i applied a Island gradient to every y value. I could give you some functions after I found the place

[ApparentlyJames (jamesisbored)]

Alright yeah that’d be great \\\\\

[Artzified]

ok so i finally loaded in and this is the gradient function:

-- apply an island gradient
function Static:ApplyGradient(x: number, y: number, z: number): number
    local distance_x = math.abs(x - self.width * 0.5)
    local distance_y = math.abs(z - self.height * 0.5)
    local distance = math.sqrt(distance_x*distance_x + distance_y*distance_y)

    local max_width = self.width * 0.5 - 10.0
    local delta = distance / max_width
    local gradient = delta * delta

    return y * math.max(0.0, 1.0 - gradient)
    -- return y
end

i forgot the source where i got this but you can modify it to fit your needs

[ApparentlyJames (jamesisbored)]

Ill give it a test, if it works I’ll mark this as the solution

[ApparentlyJames (jamesisbored)]

I may have done sumethin wrong but, it made it more flat

Just to be sure, what are the x, y and z args more exactly?
Also width and height, cause I don’t seem to be using width or anythin

[ExercitusMortem (Exercitus)]

You don’t You can use the height to create a more organic edge, by lowering certain areas under the water, instead of moving them left to right (which’ll create holes)

[ApparentlyJames (jamesisbored)]

Found out about math.noise not so long ago and overall most of these math functions are new so I don’t know much here yet. But to make sure that in:

@Artzified

-- apply an island gradient
function Static:ApplyGradient(x: number, y: number, z: number): number
    local distance_x = math.abs(x - self.width * 0.5)
    local distance_y = math.abs(z - self.height * 0.5)
    local distance = math.sqrt(distance_x*distance_x + distance_y*distance_y)

    local max_width = self.width * 0.5 - 10.0
    local delta = distance / max_width
    local gradient = delta * delta

    return y * math.max(0.0, 1.0 - gradient)
    -- return y
end

the argument x is the x index of the total island’s x axis and vice versa with z, but what i dont get is the width, height and y

[ApparentlyJames (jamesisbored)]

Actually to simplify this, found a lot of people mentioning a Falloff map,

@DecayWizard

Map without falloff filter:

Map with falloff filter:

It basically creates a border and with that border, you can subtract that with the Perlin noise (Procedural Generation Map) to create some form of an island.

How would I do this instead? Cause I think that might be the solution

[ExercitusMortem (Exercitus)]

Seems to me that they got this code from a 2d application, stuck on the z but didn’t bother changing the variable names.

But you should calculate the height of every tile based on the perlin noise and the seed.
Calculate the falloff, which is probably dependent on the result of the perlin noise + the coords. The faloff is a modifier, that you can then apply to the tile.

[ApparentlyJames (jamesisbored)]

English isn’t a primary, how would I begin to do this practically?

[ExercitusMortem (Exercitus)]

1. You have a formula to calculate the noise at a position (X,Z). The result of the calculation = Y coordinate. Place the tile at that position (X,Y,Z).

2. As for falloff, if you have a formula, you can just do the same: plug in X,Z as parameter, and it returns the Y. You can then combine the Y from step 1 and 2, to find the modified height of the tile.

[ApparentlyJames (jamesisbored)]

I feel like I know how to do it, but I cant make the map 100x100, cause of script timeout. So I’m kinda stuck here and idk what to do