Perlin noise

• originally developed for procedural textures for 3D objects in computer graphics
• generates all the pixels that make texture (wood, metal, etc.)
• ultimately gives you smooth random numbers!
  • any number you pick at a time is related to the number you pick later/before
• lots of math on top of the actual noise() function

How it works

https://youtu.be/Qf4dIN99e2w?si=MyGmgoxkv4HVeu6Z

• Interpolation function

1. Base Noise:
   • Start with a simple Perlin noise at a large scale (low frequency).
2. Adding Layers (Octaves):
   • Add more Perlin noise layers, each at a higher frequency (smaller scale) and lower amplitude (less intensity).
   • For example:
     • First octave: Big, smooth hills.
     • Second octave: Smaller hills added on top.
     • Third octave: Even smaller bumps on the smaller hills.
   • The layers combine to create a more complex, natural look.
3. Weighting the Layers:
   • Each octave contributes less to the final result. Typically, the amplitude is halved, and the frequency is doubled for each successive octave.

Random vs Perlin

• random(min, max)
• noise()
  • The argument… it’s like passing a particular point in time