public Real Magnitude()
{
return(Precision.RealSqrt(x * x + y * y + z * z));
}
/// <summary>
/// 设置质量
/// @warning This invalidates internal data for the particle.
/// Either an integration function, or the calculateInternals
/// function should be called before trying to get any settings
/// from the particle.
/// </summary>
/// <param name="mass"></param>
public void SetMass(Real mass)
{
Assert.IsFalse(Precision.RealApproximately(mass, 0));
_inverseMass = ((Real)1) / mass;
}