On Fri, Apr 15, 2011 at 2:02 PM, Boyce Griffith <griff...@cims.nyu.edu> wrote: > Hi, Folks -- > > Is there a function that gives the reference coordinates for each node > of a (Lagrange) element? > > The reason I ask is that I have a variable, say x(X), restricted to a > particular side of a particular element for which I would like to > identify any positions at which x(X0) = x0. If any such positions > exist, I then need to evaluate some other field variables at those > locations, which I can easily accomplish if I know the reference > coordinates corresponding to position X0, but not if I only know the > value(s) of X0. > > Doing this in general seems like it could be a real mess, but for lower > order Lagrange elements it does not seem too bad. However, I think that > I need to know the reference coordinates of the nodes, and I have been > unable to find an API that seems to give access to these values. (It is > my impression that functions such as Elem::point() give the current > coordinates of the node, not the reference coordinates.) > > Also, I realize this probably seems like kind of a bizarre thing to be > computing, but does there happen to be any existing code in libMesh that > could be adapted to do this kind of thing? :-) > > Thanks!
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