public Sphere(XmlNode xml)
{
this.Center = new Vector(xml.Attributes["center"].Value);
this.Radius = double.Parse(xml.Attributes["radius"].Value, new CultureInfo("en-US"));
this.Surface = Surfaces.FindSurface(xml.Attributes["surface"].Value);
}
public Plane(XmlNode xml)
{
this.Norm = new Vector(xml.Attributes["norm"].Value);
this.Offset = double.Parse(xml.Attributes["offset"].Value, new CultureInfo("en-US"));
this.Surface = Surfaces.FindSurface(xml.Attributes["surface"].Value);
}