I had a similar issue (returning NaN) when dealing with a 3D HyperBall mesh. I realized the problem was that the face I was trying to measure was not planar enough. There's a tolerance condition that has to be fulfilled at this line of the measure function. https://www.dealii.org/8.4.0/doxygen/deal.II/tria__accessor_8cc_source.html#l00993 <https://www.google.com/url?q=https%3A%2F%2Fwww.dealii.org%2F8.4.0%2Fdoxygen%2Fdeal.II%2Ftria__accessor_8cc_source.html%23l01000&sa=D&sntz=1&usg=AFQjCNHUTbiNEA6xDpXY9I4rj7boDNrUwA> I reimplemented the function with less tolerance and it had no problem.
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