Round/octagonal rings built the normal Minecraft way step diagonally
at the corners - two frame blocks touching only edge-to-edge, not
face-to-face. The scanner only checked the 6 face-adjacent neighbours,
so those blocks were treated as disconnected fragments and the whole
ring failed to register (or only a fraction of it did).
Frame discovery now flood-fills using all 26 surrounding offsets
instead of just the 6 faces. The geometric chevron walk needed the
same fix - its in-plane adjacency now checks 8 directions (orthogonal
+ diagonal) instead of 4, so stepped rings still produce a clean
single-loop walk instead of falling back to evenly-spaced chevrons.
Interior/iris flood-fill is intentionally left orthogonal-only: since
it only ever moves face-to-face, a diagonal-only frame corner already
blocks it from slipping past, so enclosure detection didn't need to
change.
Michael Burgess
282c8cfdbb