public static Vector3 Refract(Vector3 i, Vector3 n, float eta)
{
var ni = Dot(n, i);
var k = 1.0f - eta * eta * (1.0f - ni * ni);
var result = k >= 0.0f
? eta * i - n * (eta * ni + MathHelpres.FastSqrt(k))
: new Vector3();
return(result);
}
public static float Float() => (float)Next() / int.MaxValue; //random.NextFloat();
public static long Long(long min, long max) => MathHelpres.Lerp(min, max, Double());
public static double Double(double min, double max) => MathHelpres.Lerp(min, max, Double());