Set the distance to whatever you want (this will change the speed and thickness of the simulation). set the seed to any number from 1 to 100. you can also change the distance while the simulation is running, if you want. Also, I made this without any "pick random" blocks. I had to create this generator from scratch, no pun intended.
I have been doing a lot of research on random numbers and how to generate them. this pseudo random generator isn't totally random, but it is random enough to work. if you look closely, you'll see that there are a few patterns in the graphs. you can see patterns more easily at smaller distances, like 1.