@interface GKBillowNoiseSource : GKCoherentNoiseSource @property (nonatomic) double persistence; + (id)billowNoiseSourceWithFrequency:(double)a0 octaveCount:(long long)a1 persistence:(double)a2 lacunarity:(double)a3 seed:(int)a4; - (id)init; - (double)valueAt:(SEL)a0; - (id)cloneModule; - (id)initWithFrequency:(double)a0 octaveCount:(long long)a1 persistence:(double)a2 lacunarity:(double)a3 seed:(int)a4; @end