public static Polygon GetPolygonFromFaceFamilyInstance(FamilyInstance fi)
{
GeometryElement geoElem = fi.get_Geometry(new Options {
ComputeReferences = true
});
List <Curve> cs = new List <Curve>();
foreach (GeometryObject geoObj in geoElem)
{
GeometryInstance geoIns = geoObj as GeometryInstance;
if (geoIns == null)
{
continue;
}
Transform tf = geoIns.Transform;
foreach (GeometryObject geoSymObj in geoIns.GetSymbolGeometry())
{
Curve c = geoSymObj as Line;
if (c != null)
{
cs.Add(GeomUtil.TransformCurve(c, tf));
}
}
}
if (cs.Count < 3)
{
throw new Exception("Incorrect input curve!");
}
return(new Polygon(cs));
}