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re(xbg7): render the before/after — the index shift shredded capital-ship hulls

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ship_render --static on f101 (ACROPOLIS) with and without XBG7_PAD_FIRST_MATCH=1.
Identical triangle count, placements and bounds; the old wiring renders as a mess
of shards, the fixed one as a coherent hull. Kept as the evidence image for the
pad-scoring fix.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NptfmpjdpNCKEez6d2xvA9
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Claude (auto-RE)
2026-08-13 07:28:40 +00:00
parent 41b59faf5f
commit 33dc12c948
2 changed files with 10 additions and 0 deletions
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docs/re/captures/f101-index-shift-before-after.png Normal file
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docs/re/structures/xbg7-mesh.md
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@@ -1448,3 +1448,13 @@ the grouped `.dat` break composites in `ptc_pack` (`f102`/`f104`/`e107`, whose
marker lists are documented not to map onto the stored blocks), `e201_bdy_03_m` marker lists are documented not to map onto the stored blocks), `e201_bdy_03_m`
(2 containers) and `_rou_f402_dead` (9) — each already suspect on other grounds, (2 containers) and `_rou_f402_dead` (9) — each already suspect on other grounds,
and now the concrete next targets. and now the concrete next targets.
**And it is plainly visible** — the check the numbers kept failing at.
`ship_render --static` on `f101` (the ACROPOLIS, whose 25 448-vertex hull carried
2 156 degenerate triangles) both ways:
[before / after](../captures/f101-index-shift-before-after.png). The old decode is
a torn mess of shards; the new one is a coherent capital ship with flat decks,
panel lines, bridge tower and funnels. Same 31 991 triangles, same 4 placements,
same bounds — only the wiring differs. Third time this project has learned it:
**render the output**; a metric that cannot see a 1 600-unit slab could not see
this either.