+void Path3D::set_layer(float l)
+{
+ z_offs = l*track.get_track().get_layout().get_catalogue().get_gauge()*0.01;
+}
+
+long Path3D::get_instance_key() const
+{
+ return reinterpret_cast<long>(&track.get_type());
+}
+
+void Path3D::render(GL::Renderer &renderer, const GL::Tag &tag) const