public static void SwapMuscles(this AnimationHumanStream stream, MuscleHandle a, MuscleHandle b)
{
var t = stream.GetMuscle(a);
stream.SetMuscle(a, stream.GetMuscle(b));
stream.SetMuscle(b, t);
}
public static void MultMuscle(this AnimationHumanStream stream, MuscleHandle h, float f)
{
stream.SetMuscle(h, f * stream.GetMuscle(h));
}