public float Evaluate(float x, float y, float z)
{
int xi0 = ((int)Floor(x)) & TABLE_SIZE_MASK;
int yi0 = ((int)Floor(y)) & TABLE_SIZE_MASK;
int zi0 = ((int)Floor(z)) & TABLE_SIZE_MASK;
int xi1 = (xi0 + 1) & TABLE_SIZE_MASK;
int yi1 = (yi0 + 1) & TABLE_SIZE_MASK;
int zi1 = (zi0 + 1) & TABLE_SIZE_MASK;
float tx = x - (int)Floor(x);
float ty = y - (int)Floor(y);
float tz = z - (int)Floor(z);
float u = MathR.Smoothstep(tx);
float v = MathR.Smoothstep(ty);
float w = MathR.Smoothstep(tz);
// Edge Vectors
Vector3 c000 = Gradient[HashV3(xi0, yi0, zi0)];
Vector3 c100 = Gradient[HashV3(xi1, yi0, zi0)];
Vector3 c010 = Gradient[HashV3(xi0, yi1, zi0)];
Vector3 c110 = Gradient[HashV3(xi1, yi1, zi0)];
Vector3 c001 = Gradient[HashV3(xi0, yi0, zi1)];
Vector3 c101 = Gradient[HashV3(xi1, yi0, zi1)];
Vector3 c011 = Gradient[HashV3(xi0, yi1, zi1)];
Vector3 c111 = Gradient[HashV3(xi1, yi1, zi1)];
float x0 = tx, x1 = tx - 1;
float y0 = ty, y1 = ty - 1;
float z0 = tz, z1 = tz - 1;
// Point Vectors
Vector3 p000 = new Vector3(x0, y0, z0);
Vector3 p100 = new Vector3(x1, y0, z0);
Vector3 p010 = new Vector3(x0, y1, z0);
Vector3 p110 = new Vector3(x1, y1, z0);
Vector3 p001 = new Vector3(x0, y0, z1);
Vector3 p101 = new Vector3(x1, y0, z1);
Vector3 p011 = new Vector3(x0, y1, z1);
Vector3 p111 = new Vector3(x1, y1, z1);
// Lerping
float a = MathR.Lerp(Vector3.Dot(c000, p000), Vector3.Dot(c100, p100), u);
float b = MathR.Lerp(Vector3.Dot(c010, p010), Vector3.Dot(c110, p110), u);
float c = MathR.Lerp(Vector3.Dot(c001, p001), Vector3.Dot(c101, p101), u);
float d = MathR.Lerp(Vector3.Dot(c011, p011), Vector3.Dot(c111, p111), u);
float e = MathR.Lerp(a, b, v);
float f = MathR.Lerp(c, d, v);
return(MathR.Lerp(e, f, w));
}