public IXbimShapeGeometryData Mesh(IfcRepresentationItem shape)
{
var fbm = shape as IfcFaceBasedSurfaceModel;
if (fbm != null) return Mesh(fbm);
var sbm = shape as IfcShellBasedSurfaceModel;
if (sbm != null) return Mesh(sbm);
var cfs = shape as IfcConnectedFaceSet;
if (cfs != null) return Mesh(cfs);
var fbr = shape as IfcFacetedBrep;
if (fbr != null) return Mesh(fbr);
throw new ArgumentException("Unsupported representation type for tessellation, " + shape.GetType().Name);
}
