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re: n206 was fixed after all -- the audit was classifying by geometry, not buffer

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debug_grouped_report (why_rejected) shows n206_02's alternative pool is ACCEPTED
at pad 0 under production gates and is in the candidate list -- and the decoder
does take it: n206_02 now anchors at 0x342d984. The 'still collapsed' reading
came from the audit comparing decoded geometry, and that offset holds a direct
(unmirrored) copy, so a separated pair still looked identical. The audit now
requires a SHARED BUFFER to call it a collapse: disc-wide 18 exact mirrors, 16
related, 0 collapses, 0 unrelated -- and the regression test drops its exception.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Claude (auto-RE)
2026-08-12 04:10:05 +00:00
parent bb0c94c0ce
commit db8104ab99
6 changed files with 159 additions and 23 deletions
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11
crates/sylpheed-formats/examples/twin_mirror_audit.rs
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@@ -74,6 +74,15 @@ fn main() {
related += 1;
continue;
}
// Identical GEOMETRY is only a collapse if it also comes from the
// same buffer: a container may store a part twice unmirrored, and
// then two twins on two copies decode identically and correctly.
let shared_buffer = m.meshes[0].vbuf_offset.is_some()
&& m.meshes[0].vbuf_offset == t.meshes[0].vbuf_offset;
if ident && !shared_buffer {
related += 1;
continue;
}
if ident {
same += 1;
if examples.len() < 6 {
@@ -101,7 +110,7 @@ fn main() {
}
println!("twin pairs of equal vertex count: {}", same + mirrored + unrelated + related);
println!(" exact X-mirror (expected) : {mirrored}");
println!(" IDENTICAL (collapse) : {same}");
println!(" IDENTICAL, one buffer (collapse) : {same}");
println!(" related other way (Y/Z mirror, reordered): {related}");
println!(" unrelated (mis-anchor?) : {unrelated}");
for e in examples {