// Get the noise at a location.
public float GetAt(Vector2 position)
{
// This is heavily based on the video by 'The Art of Code'
// https://www.youtube.com/watch?v=zXsWftRdsvU
Vector2 intiger = new Vector2()
{
X = Mathf.Truncate(position.X),
Y = Mathf.Truncate(position.Y)
};
Vector2 fraction = position - intiger;
// Smoothly interperlate the fraction of each 'cell'
fraction = fraction * fraction * new Vector2(3 - 2 * fraction.X, 3 - 2 * fraction.Y);
// I am not blending diagonally as I want the noise to have a bias to stick to the voxel grid.
float btmL = sample(intiger);
float btmR = sample(intiger + Vector2.UnitX);
float topL = sample(intiger + Vector2.UnitY);
float topR = sample(intiger + Vector2.One);
float btm = lerp(btmL, btmR, fraction.X);
float top = lerp(topL, topR, fraction.X);
return(lerp(btm, top, fraction.Y));
}
float sample(Vector2 position)
{
// Make a crazy big number and do some stuff to it. Then get only
// the decimal part of this big number.
unchecked {
float t = position.X * xSample + position.Y * ySample;
t = (1 + Mathf.Sin(t) * 0.5f) * scaler;
return(t - Mathf.Truncate(t));
}
}
/// <summary> /// /// </summary> /// <param name="x"></param> /// <returns></returns> public static Half Truncate(Half x) => (Half)M.Truncate(x);