//
public ElasticNode(MKENodeType t = MKENodeType.uv)
{
id = 0;
Type = t;
x1 = x2 = u = v = fiu = fiv = fx = fy = mxz = myz = double.NaN;
}
//
public ThermoNode(MKENodeType type = MKENodeType.t)
{
id = 0;
Type = type;
x1 = x2 = t = double.NaN;
}