On Wed, 9 Mar 2011, Roman Vetter wrote:

>> Looking over this... would it make sense to interpolate instead when
>> we find nodes with missing Lagrange DoFs, to get an isoparametric
>> result?  VTK supports second order elements, and first order data is a
>> subset of second order data, so we could still naturally represent it
>> on those elements.
>
> I'm probably not the right person to tell, as I haven't been in the
> situation of using such elements. From a pure VTK point of view, I'd
> say why not, but I don't know how people or third party visualizers
> would expect to find their data in this case.

It should be the same as for a truely isoparametric result, no?  If
the visualizer can handle a biquadratic element with three biquadratic
variables, then by definition it can handle a biquadratic element with
three biquadratic variables even when one of those variables
suspiciously only takes on values that could also be expressed in a
bilinear basis.
---
Roy

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