public Collision(XElement node)
{
Name = (string)node.Attribute("name"); // optional
Origin = (node.Element("origin") != null) ? new Origin(node.Element("origin")) : null; // optional
Geometry = new Geometry(node.Element("geometry")); // required
}
public Inertial(XElement node)
{
Origin = (node.Element("origin") != null) ? new Origin(node.Element("origin")) : null; // optional
Mass = (double)node.Element("mass").Attribute("value"); // required
Inertia = new Inertia(node.Element("inertia")); // required
}