Perlin Octaves

//try values for persistance like 0.75 - 0.25

public double OctavePerlin(double x, double y, double z, int octaves, double persistence) 
{
    double total = 0;
    double frequency = 1;
    double amplitude = 1;
    double maxValue = 0;  // Used for normalizing result to 0.0 - 1.0
    for(int i=0;i<octaves;i++) 
    {
        total += perlin(x * frequency, y * frequency, z * frequency) * amplitude;
        
        maxValue += amplitude;
        
        amplitude *= persistence;
        frequency *= 2;
    }
    
    return total/maxValue;
}