//public Text3d()
//{
//}
public Text3d(Vector3d center, Vector3d up, string text, float fontsize, double scale)
{
Text = text;
this.up = up;
this.center = center;
this.scale = scale;
this.top = Vector3d.AddVectors(center, Vector3d.Scale(up, scale));
if (fontsize < 0)
{
sky = false;
}
}