Generating rolling hills of different height and width like Tiny Wings?

Question

How can I generate rolling hills of different height and width like Tiny Wings? Right now I'm using sin() but it obviously generates uniform hills repeating forever and ever.

What's the secret?

Thanks!

Answer 1

Certainly not a procedural generation expert - but you could try additively combining multiple randomly generate sin/cos functions with different periods. The more you add, the more random seeming it will be.

Something like this.