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Anders Logg wrote:
The comment in the non-matching interpolation demo says "L2 projection", but it looks like it's direct interpolation?
Yes, I've changed the comment.
I'm also confused about how smooth v1 looks. If it interpolates v0, it should be just as rough but on a finer mesh.
It should appear smoother. v0 is on a P_3 element and a coarse mesh, whereas v1 is P_1 on a finer mesh. The post-processing of higher-order elements often looks a bit rough because we only visualise the solution at the vertices.
Garth
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