public RailSegment(RailSegment source, RailPiece railPiece, bool copyCurve)
{
RailPiece = railPiece;
Curve = copyCurve ? new BezierCurve3(source.Curve) : source.Curve;
}
public RailSegment(BezierCurve3 curve, RailPiece railPiece)
{
RailPiece = railPiece;
Curve = curve;
}