The 3D PFEM consist of nonpolynomial functions, which require special integration techniques.
It is seen that the range for the error norms of the VPHE elements is similar to those obtained using Wachspress and mean value coordinate for 2 dimensions  and 3D PFEM  for 3 dimensions, but the integration of the stiffness matrices is much simpler.
u~ will be higher (lower) than PFEM
for lower (higher) values of PFEM
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