public float Evaluate(float x, float y)
{
var xy = new Vector2(x, y);
var ix = Mathf.FloorToInt(x);
var iy = Mathf.FloorToInt(y);
var minDis = float.MaxValue;
for (var i = ix - 1; i <= ix + 1; i++)
{
for (var j = iy - 1; j <= iy + 1; j++)
{
var fi = MathUtility.ModPositive(i, _loopSize.x);
var fj = MathUtility.ModPositive(j, _loopSize.y);
var hash = RandomHash.Get(fi, fj);
_lcgRandom.Seed = (uint)(hash * (uint.MaxValue >> 9));
var checkPointCount = _lcgRandom.NextRange(1, _maxPointsInCell + 1);
for (var idx = 0; idx < checkPointCount; idx++)
{
var rx = i + _lcgRandom.NextFloat();
var ry = j + _lcgRandom.NextFloat();
var dis = _distanceCalculator(xy, new Vector2(rx, ry));
minDis = Mathf.Min(dis, minDis);
}
}
}
return(_distanceNormalize(minDis));
}
public float Evaluate(float x, float y)
{
var ix = Mathf.FloorToInt(x);
var iy = Mathf.FloorToInt(y);
return(RandomHash.Get(ix, iy) / 128f - 1);
}
public float Evaluate(float x)
{
var ix = Mathf.FloorToInt(x);
var fx = x - ix;
var p1 = fx;
var p2 = fx - 1;
var hash1 = RandomHash.Get(ix);
var hash2 = RandomHash.Get(ix + 1);
_random.Seed = (uint)(hash1 * magicNumber);
var g1 = _random.NextFloat() * 4 - 2;
_random.Seed = (uint)(hash2 * magicNumber);
var g2 = _random.NextFloat() * 4 - 2;
var v1 = g1 * p1;
var v2 = g2 * p2;
return(MathUtility.SmoothLerp2(v1, v2, fx));
}
public float Evaluate(float x, float y)
{
var ix = Mathf.FloorToInt(x);
var iy = Mathf.FloorToInt(y);
var fx = x - ix;
var fy = y - iy;
var ix1 = ix + 1;
var iy1 = iy + 1;
ix = MathUtility.ModPositive(ix, _loopSize.x);
iy = MathUtility.ModPositive(iy, _loopSize.y);
ix1 = MathUtility.ModPositive(ix1, _loopSize.x);
iy1 = MathUtility.ModPositive(iy1, _loopSize.y);
var p1 = new Vector2(fx, fy);
var p2 = p1 - new Vector2(1, 0);
var p3 = p1 - new Vector2(0, 1);
var p4 = p1 - new Vector2(1, 1);
var hash1 = RandomHash.Get(ix, iy);
var hash2 = RandomHash.Get(ix1, iy);
var hash3 = RandomHash.Get(ix, iy1);
var hash4 = RandomHash.Get(ix1, iy1);
var g1 = RandomGrad.GetVector(hash1);
var g2 = RandomGrad.GetVector(hash2);
var g3 = RandomGrad.GetVector(hash3);
var g4 = RandomGrad.GetVector(hash4);
var v1 = Vector2.Dot(g1, p1);
var v2 = Vector2.Dot(g2, p2);
var v3 = Vector2.Dot(g3, p3);
var v4 = Vector2.Dot(g4, p4);
var a = MathUtility.SmoothLerp2(v1, v2, fx);
var b = MathUtility.SmoothLerp2(v3, v4, fx);
return(MathUtility.SmoothLerp2(a, b, fy));
}
private static float RandomValue(int x)
{
var hash = RandomHash.Get(x);
return((hash - 128) / 128f);
}