private void SHOW_N_S_W_E(Point3d p1, StreamWriter file)
{
Point3d p = p1.Copy();
char[] dir = { 'E', 'N', 'U' };
if (p.X < 0)
{
dir[0] = 'W';
p.X = -p.X;
}
if (p.Y < 0)
{
dir[1] = 'S';
p.Y = -p.Y;
}
if (p.Z < 0)
{
dir[2] = 'D';
p.Z = -p.Z;
}
file.WriteLine(dir[0] + " {0:0.##} " + dir[1] + " {1:0.##} " + dir[2] + " {2:0.##}", p.X, p.Y, p.Z);
}