/// <summary>
/// Calculates a fast approximation of the square root of the specified number.
/// </summary>
/// <param name="value">A number.</param>
/// <returns>Approximated square root of the number.</returns>
public static float FastSqrt(float value)
{
Int32Single u = new Int32Single();
u.f = value;
u.i = (1 << 29) + (u.i >> 1) - (1 << 22) - 0x4C000;
return(u.f);
}
/// <summary>
/// Calculates a fast approximation of the reciprocal of the square root of the specified number.
/// </summary>
/// <param name="value">A number.</param>
/// <returns>Approximated reciprocal of the square root of the number.</returns>
public static float FastInvSqrt(float value)
{
Int32Single u = new Int32Single();
u.f = value;
u.i = 0x5F3759DF - (u.i >> 1);
return((1.5f - value * 0.5f * u.f * u.f) * u.f);
}
