Require Function interpolation before file output

Open garth-wells opened this issue 4 years ago • 0 comments

A long standing issue is the 'magic' behind the scenes if interpolation to another space (usually P1) before output to a file. This is not sufficiently explicit, can be unexpectedly expensive and give surprising visualisation results, especially with H(div/curl) spaces.

Now that we have fast interpolation between spaces, we should require interpolation to a space supported by the file backend before calling the file output function.