public static Polygon3d ToPolygon3d(this Polygon2d polygon, Func <V2d, int, V3d> point_index_copyFun) => new Polygon3d(polygon.GetPointArray(point_index_copyFun));
/// <summary>
/// Transforms a 2d polygon into 3d.
/// The z-coordinate is assumed to be zero.
/// </summary>
public static Polygon3d Transformed(this Polygon2d polygon, M44d transform)
{
return(new Polygon3d(polygon.GetPointArray(p => transform.TransformPos(p.XYO))));
}
public static Polygon3d ToPolygon3d(
this Polygon2d polygon, Func <V2d, V3d> point_copyFun)
{
return(new Polygon3d(polygon.GetPointArray(point_copyFun)));
}