static void Mul(ref WindowsFormsApp1.Matrix3d m, ref Vector3 v)
{
WindowsFormsApp1.Vector3d v2 = new WindowsFormsApp1.Vector3d(v.X, v.Y, v.Z);
v2.Mul(m);
v.X = v2.X;
v.Y = v2.Y;
v.Z = v2.Z;
}
public static Vector3 ToVector3(this WindowsFormsApp1.Vector3d v)
{
return(new Vector3(v.X, v.Y, v.Z));
}