Commit c4bd8bf7 authored by Martin Nolte's avatar Martin Nolte

[!2] Implement element geometry mapping as identity

Merge branch 'feature/geometry-mapping' into 'master'

In absense of a reference element for geometry type none we allow the grid to
choose its own reference element (on a per element basis). The only obvious
restriction is the world dimension, which must coincide with the element
dimension. For PolygonGrid elements we may thus simply choose the identity
mapping. For lines and vertices, we use the linear mapping.

See merge request [!2]

parents d728b47d af5b0111
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