public FractalBillowDeriv(T noise, int octaves, float lacunarity = 1.99f, float gain = 0.5f, float weightedStrength = 0)
{
mNoise = noise;
this.octaves = octaves;
this.lacunarity = lacunarity;
this.gain = gain;
this.weightedStrength = weightedStrength;
offset = real3.zero;
fractalBounding = CalculateFractalBounding(octaves, gain);
}
public real GetValue(int mSeed, real3 point)
{
int seed = mSeed;
float amp = fractalBounding;
float freq = warpFrequency;
for (int i = 0; i < octaves; i++)
{
real3 ps = point;
warp.Warp(warpSeed, warpFrequency, warpAmp, ps, ref point);
seed++;
amp *= amp;
freq *= warpFrequency;
}
return(noise.GetValue(seed, point));
}
public real GetValue(int mSeed, real3 point)
{
int seed = mSeed;
real sum = 0;
real amp = fractalBounding;
real3 offset = this.offset;
for (int i = 0; i < octaves; i++)
{
real noise = abs(mNoise.GetValue(seed, point)) * 2 - 1;
sum += noise * amp;
amp *= lerp(1.0f, (noise + 1) * 0.5f, weightedStrength);
point = point * lacunarity + offset;
amp *= gain;
offset *= lacunarity;
}
return(sum);
}
public real GetValue(int mSeed, real3 point)
{
int seed = mSeed;
real sum = 0;
real amp = fractalBounding;
real3 offset = this.offset;
for (int i = 0; i < octaves; i++)
{
real noise = PingPong((mNoise.GetValue(seed++, point) + 1) * pingPongStength);
sum += (noise - 0.5f) * 2 * amp;
amp *= lerp(1.0f, noise, weightedStrength);
point = point * lacunarity + offset;
amp *= gain;
offset *= lacunarity;
}
return(sum);
}
public real GetValue(int mSeed, real3 point, out real3 dsum)
{
int seed = mSeed;
real sum = 0;
real amp = fractalBounding;
real3 offset = this.offset;
dsum = real3.zero;
for (int i = 0; i < octaves; i++)
{
real noise = abs(mNoise.GetValue(seed, point, out var deriv)) * 2 - 1;
dsum += deriv;
sum += noise * amp / (1 + dot(dsum, dsum));
amp *= lerp(1.0f, (noise + 1) * 0.5f, weightedStrength);
point = point * lacunarity + offset;
amp *= gain;
offset *= lacunarity;
}
return(sum);
}
public real GetValue(int mSeed, real3 point)
{
return(GetValue(mSeed, point, out _));
}
public static real GetValue <T>(this T noise, int seed, float frequency, real3 point) where T : struct, INoise3D
{
point *= frequency;
return(noise.GetValue(seed, point));
}
public real GetValue(int seed, real3 point)
{
warp.Warp(warpSeed, warpFrequency, warpAmp, point, ref point);
return(noise.GetValue(seed, point));
}
