public float GetXZ(VectorXZ position, int octaves, int resolution, float bias)
{
float fNoise = 0.0f;
float fScale = 1.0f;
float fScaleAcc = 0.0f;
for (int i = 0; i < octaves; i++)
{
int pitch = resolution >> i;
if (pitch <= 0)
{
continue;
}
VectorXZ sample1 = new VectorXZ(
(position.X / pitch) * pitch,
(position.Z / pitch) * pitch);
VectorXZ sample2 = new VectorXZ(
(sample1.X + pitch),
(sample1.Z + pitch));
float fBlendX = (float)(position.X - sample1.X) / (float)pitch;
float fBlendZ = (float)(position.Z - sample1.Z) / (float)pitch;
float fSampleT = (1.0f - fBlendX) * this.GetNoise(sample1) + fBlendX * this.GetNoise(new VectorXZ(sample2.X, sample1.Z));
float fSampleB = (1.0f - fBlendX) * this.GetNoise(new VectorXZ(sample1.X, sample2.Z)) + fBlendX * this.GetNoise(sample2);
fScaleAcc += fScale;
fNoise += (fBlendZ * (fSampleB - fSampleT) + fSampleT) * fScale;
fScale = fScale / bias;
}
return(fNoise / fScaleAcc);
}
private float GetNoise(VectorXZ position)
{
if (this.Noise[position.X, position.Z] == 0.0)
{
this.Noise[position.X, position.Z] = this.GetXZNoise(position);
}
return(this.Noise[position.X, position.Z]);
}
private float GetXZNoise(VectorXZ position)
{
string key = position.X.ToString() + position.Z.ToString() + this.Seed;
return((float)Hash.Jenkins(key) / (float)uint.MaxValue);
}