public Task ModifyVertices(SQT.Context context, SQT.Node node, CancellationTokenSource cancellation)
{
return(Task.Factory.StartNew(() =>
{
for (int i = 0; i < node.positions.Length; i++)
{
Noise.Perlin.PerlinSample sample = GetSample(node.positions[i]);
node.positions[i] += node.normals[i] * sample.value;
node.normals[i] = (node.normals[i] - sample.derivative).normalized;
}
}, cancellation.Token));
}
Noise.Perlin.PerlinSample GetSample(Vector3 position)
{
float strength = this.strength;
float frequency = this.frequency;
Noise.Perlin.PerlinSample sum = GetSample(position, frequency) * strength;
for (int i = 1; i < octaves; i++)
{
strength *= persistence;
frequency *= lacunarity;
Noise.Perlin.PerlinSample sample = GetSample(position, frequency) * strength;
sum += sample;
}
return(sum);
}
Noise.Perlin.PerlinSample GetSample(Vector3 position, float frequency)
{
Noise.Perlin.PerlinSample sample = perlin.Sample(position * frequency);
sample.derivative *= frequency;
return(sample);
}
