public float SampleSmart(Vector2D point, float threshold)
{
threshold = Math.Max(Spacing, threshold); //threshold can be smaller then spacing
Probe probe;
SampleProbe(point, out probe);
//interpolate between the 4 corners (first 2x along X - then 1x along Y)
float dxTop = (probe.TopRight - probe.TopLeft);
float dxBottom = (probe.BottomRight - probe.BottomLeft);
float dx = dxBottom * probe.V + (1 - probe.V) * dxTop;
//the more the gradient dx approaches the threshold, the less we interpolate
float sx = CgMath.Linstep(Spacing, threshold, Math.Abs(dx));
float uSmart = CgMath.Lerp(probe.U, (float)Math.Round(probe.U), sx);
float xTop = probe.TopLeft + uSmart * dxTop;
float xBottom = probe.BottomLeft + uSmart * dxBottom;
float dy = (xBottom - xTop);
//the more the gradient approaches the threshold, the less we interpolate
float sy = CgMath.Linstep(Spacing, threshold, Math.Abs(dy));
float vSmart = CgMath.Lerp(probe.V, (float)Math.Round(probe.V), sy);
return(xTop + vSmart * dy);
}
public Vector2D SampleSmoothStepped(Vector2D point, float edge0, float edge1)
{
Probe probe;
SampleProbe(point, out probe);
float tl = (1.0f - probe.U) * (1.0f - probe.V);
float tr = probe.U * (1.0f - probe.V);
float bl = (1.0f - probe.U) * probe.V;
float br = probe.U * probe.V;
float length = tl * probe.TopLeft.Length +
tr * probe.TopRight.Length +
bl * probe.BottomLeft.Length +
br * probe.BottomRight.Length;
Vector2D result = tl * probe.TopLeft +
tr * probe.TopRight +
bl * probe.BottomLeft +
br * probe.BottomRight;
return(result.Sized(CgMath.Linstep(edge0, edge1, length)));
}
public Vector2D SampleLinStepped(Vector2D point, float edge0, float edge1)
{
Vector2D dir = Sample(point);
return(dir.Sized(CgMath.Linstep(edge0, edge1, dir.Length)));
}