Need help with perlin noise

[tidal crater]

Heya i've been trying to understand perlin noise using this video https://www.youtube.com/watch?v=MJ3bvCkHJtE&t=938s

sadly after hours of trying, i cant get further than this. Does anyone have a idea what might fix it?

I've checked. The Gradient Vectors seem to be set up correctly. But the vectors pointing towards the pixel is killing me... i have absolutely no clue how to set em

i've tried using length_dir for that-- didnt come very far

How i tried to do it:

I found a function that is pseudo random, i just added a global.seed thing to it so i can attach a seed to this thing.

After that i place the chunks i want and use the rand function 4 times for each corner of the chunk

the rand function returns a value betwen 0 and 1. With that i made it decide which gradient vector to use

After that i set 4 variables up for each corner with that funciton

Which ends up with this:

now heres the part that is a bit messy

The video from fataho said that the position of the pixel where the vectors have to point towards has to be a decimal value. so i figured that i do a for loop and divide the i with the chunk size in order to get that value

now i created a function where i use lengthdir to set the vectors

with that function i created 4 local variables for each vector that is supposed to be pointing towards that pixel

Now i apply dot product to each vector i created. I then lerp every dot product etc. etc. and then add the final value to the Grid.

then i draw it to see if it works

aaaaand

it doesnt

[dire raven]

have you seen Sam Spader perlin noise video?
Maybe its too basic for you but maybe it gives you some ideas https://www.youtube.com/watch?v=ms1wczeXAT0

[tidal crater]

oooh! that might just be the video i need!

[cobalt grove]

ken perlin has an implementation for java that can almost be 1:1 turned into gml and is much much much faster than his original implementation. looks like that sam spade video uses his java implementation

[serene basalt]

I've used Sam's a lot, it's nice.

There's also this one: https://youtu.be/olFPB8aD2xE

[cobalt grove]

i do all my 1d perlin noise with animcurves haha

[serene basalt]

Hehe yeah, I remember 😄

[jaunty glen]

dragonite also made this some time ago:
https://dragonite.itch.io/macaw

might be useful to look at