[Dune] [#658] Cannot get GeometryGrid with DiscreteCoordFunction to work

[Dune]

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FS#658 - Cannot get GeometryGrid with DiscreteCoordFunction to work
User who did this - Martin Nolte (nolte)

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First of all, you're probably right that the documentation should be improved by 2 simple examples and I'll try to come up with them as soon as possible...

As to your problem: You're completely right, the subIndex method is what you intend, yet it cannot be called for arbitrary entities. There are 2 workarounds that I know of:
a) Use AlbertaGrid as host grid (it supports the method subIndex for all codimension entities -- if I didn't forget to commit this).
b) Try using YaspGrid or UGGrid (they only provide elements and vertices) and specialize the method for the 2 types of entities that might appear.

Actually this problem is what I meant when I asked for the extended subIndex method on the December 2008 developer meeting in Heidelberg.

You can also take a look at the CachedCoordFunction (which wraps an analytical function into a discrete one by caching the corner values).

I hope this helps you understand a bit better. As I said, demo implementations will follow as soon as possible.

Yours,

Martin

I hope this helps you understand the possibilities a bit better.
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