public static Quaternion Rotation(uint seed, uint data)
{
// James Arvo's classic approach
var v = Direction(seed, data);
var phi = XXHash.Float(seed, data + 0x20000000, 0, TAU);
var q1 = Quaternion.AngleAxis(phi, Vector3.forward);
var q2 = Quaternion.FromToRotation(Vector3.forward, v);
return(q1 * q2);
}
public static Vector3 Direction(uint seed, uint data)
{
// http://corysimon.github.io/articles/uniformdistn-on-sphere/
var theta = XXHash.Float(seed, data, 0, TAU);
var phi = Mathf.Acos(XXHash.Float(seed, data + 0x10000000, -1, 1));
var sin_phi = Mathf.Sin(phi);
var x = sin_phi * Mathf.Cos(theta);
var y = sin_phi * Mathf.Sin(theta);
var z = Mathf.Cos(phi);
return(new Vector3(x, y, z));
}
Vector3 GetOutput(Flow flow)
{
var seed = flow.GetValue <uint>(Seed);
var data = flow.GetValue <uint>(Data);
var min = flow.GetValue <Vector3>(Min);
var max = flow.GetValue <Vector3>(Max);
var x = XXHash.Float(seed, data + 0x00000000, min.x, max.x);
var y = XXHash.Float(seed, data + 0x10000000, min.y, max.y);
var z = XXHash.Float(seed, data + 0x20000000, min.z, max.z);
return(new Vector3(x, y, z));
}
ControlOutput OnEnter(Flow flow)
{
var data = flow.stack.GetElementData <Data>(this);
var frequency = flow.GetValue <float>(Frequency);
var octave = flow.GetValue <uint>(Octave);
var amplitude = flow.GetValue <float>(Amplitude);
var seed = flow.GetValue <uint>(Seed);
var time = data.Time + Time.deltaTime * frequency;
var n = NoiseUtil.Fbm(XXHash.Float(seed, 0u, -1000, 1000), time, octave);
data.Time = time;
data.Value = n * amplitude / 0.75f;
return(Exit);
}
ControlOutput OnEnter(Flow flow)
{
var data = flow.stack.GetElementData <Data>(this);
var frequency = flow.GetValue <float>(Frequency);
var octave = flow.GetValue <uint>(Octave);
var angles = flow.GetValue <Vector3>(Angles);
var seed = flow.GetValue <uint>(Seed);
var time = data.Time + Time.deltaTime * frequency;
var nx = NoiseUtil.Fbm(XXHash.Float(seed, 0u, -1000, 1000), time, octave);
var ny = NoiseUtil.Fbm(XXHash.Float(seed, 1u, -1000, 1000), time, octave);
var nz = NoiseUtil.Fbm(XXHash.Float(seed, 2u, -1000, 1000), time, octave);
var nv = Vector3.Scale(new Vector3(nx, ny, nz), angles) / 0.75f;
data.Time = time;
data.Value = Quaternion.Euler(nv);
return(Exit);
}
float GetOutput(Flow flow)
=> XXHash.Float(flow.GetValue <uint>(Seed), flow.GetValue <uint>(Data),
flow.GetValue <float>(Min), flow.GetValue <float>(Max));