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