Hey everyone! I've gotten interested in 2d terrain generation, and would like to implement some very basic perlin noise to generate it. How should I do this? I've used prebuilt noise functions before, and I kind of understand how it works, but never wrote one myself. thanks!

Here's a short example I made:

https://scratch.mit.edu/projects/394322754/

Herbin12 wrote:

Here's a short example I made:

https://scratch.mit.edu/projects/394322754/

Yes, but this is not Perlin noise or Simplex noise. This is an example of a Perlin noise. (on a 2D array)

If you want to know about Perlin/Simplex noise, these Wikipedia article might help you:
Perlin noise
Simplex noise

Thanks, I'll look into it.

Is Perlin Noise a specific algorithm? Or is it a synonym for random terrain generation? You can make a terrain generator with this block

(pick random () to ())

BillNyeTheKGBSpy wrote:

Is Perlin Noise a specific algorithm? Or is it a synonym for random terrain generation? You can make a terrain generator with this block

(pick random () to ())

Yes, that would work, However, that will make a very rough and spiky terrain, and doesn't make the smooth noise the usual Perlin noise would.
Here's the picture (again):

gilbert_given_189 wrote:

BillNyeTheKGBSpy wrote:

Is Perlin Noise a specific algorithm? Or is it a synonym for random terrain generation? You can make a terrain generator with this block

(pick random () to ())

Yes, that would work, However, that will make a very rough and spiky terrain, and doesn't make the smooth noise the usual Perlin noise would.
Here's the picture (again):

I honestly have no clue what that picture represents, it looks like a carpet to me. A very blurry carpet.

Here. I found a project that you could look into. https://scratch.mit.edu/projects/392769129/

You see if some of those helps you https://scratch.mit.edu/search/projects?q=perlin%2Bnoise

simple get a whole bunch of sound pick random ones play the selected ones together and use the volume thing to draw a volume map then fill the volume map in BOOM! perlin noise sorta

DJH666666 wrote:

simple get a whole bunch of sound pick random ones play the selected ones together and use the volume thing to draw a volume map then fill the volume map in BOOM! perlin noise sorta

althought the generation progress would be loud xD

You could use a

(pick random (_) to ()))

for the first pixel or value, then make slight alterations for every other pixel

I made this thing that kinda follows this rule, it could easily be implemented or changed to create smooth noise
https://scratch.mit.edu/projects/589946056/

bSpyder wrote:

You could use a

(pick random (_) to ()))

for the first pixel or value, then make slight alterations for every other pixel

I made this thing that kinda follows this rule, it could easily be implemented or changed to create smooth noise
https://scratch.mit.edu/projects/589946056/

So, we need a

(pick random (a) to (b))

then make smaller alterations for each and every pixel. Am I getting this correct?

My best approach would be:

set [currentHeight v] to [5]
repeat [10] // changeable
 change [currentHeight v] by (pick random [-2] to [2]) // these are also changeable
 do some rendering with the blocks
end

Hope this helps!

Maybe this will help: https://scratch.mit.edu/projects/501242200/