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map: the three capitals with no traced outline drew nothing; feather them

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OpenMapClassic declines to stitch a city with no MapCityMask and names
the three it means -- Stormwind, Ironforge, Darnassus -- so zooming into
the Alliance capitals showed the zone's painting of them and never their
own map. The stated worry is a hard box.

PlaceBase takes the outline and the edge feather in the same argument,
and the city branch passes MapCityMask\<id> as the feather, so a city
with no outline can go through the slot its outline would have used. A
feather is the answer to a hard box. Captured at zoom 30: Stormwind's
districts, harbour and Valley of Heroes, blended into Elwynn.

The trace was attempted first, and this is the record so nobody re-runs
it: unlike the zones' land masks there are three shipped city masks to
fit against, so it is a fitting problem. Local-contrast detail,
threshold, close at quarter scale, largest blob, holes filled, dilate,
blur, swept over the three parameters -- best IoU 0.58, and it swallows
the sheet's own torn frame, because a city sheet is busy out to its
border where Orgrimmar's is blank parchment. A 0.58 hull shipped as a
trace would be a guess in an artist's clothes.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SgstFWtn1RxEJ5kVrpgYwn
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grom
2026-11-03 19:09:22 -07:00
co-authored by Claude Opus 5
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@@ -3061,3 +3061,30 @@ across the whole zone. The realm's own `<Continent>.zmp` is authoritative about
128x128 over a continent — the largest zone on Azeroth owns 169 cells, about 13x13, which is a
28-px block on a 256 mask. Either route would be a guess dressed as art. The feather is not: it is
the mask the addon already asks for.
## Stormwind, Ironforge and Darnassus drew nothing at all
The city branch declines to stitch a city with no traced outline, and says so by name: *"Stormwind
/ Ironforge / Darnassus have no mask — avoid hard boxes."* `MapCityMask/` ships three, for
Orgrimmar, Thunder Bluff and Undercity. So zooming into the Alliance capitals showed the zone's
own painting of them and never their own map.
The worry is right and the remedy was already to hand. `PlaceBase` takes the outline and the edge
feather **in the same argument** — the city branch passes `MapCityMask\<id>` as the `feather` —
so a city with no outline can go through the slot its outline would have used. A feather is the
answer to a hard box. The three capitals now draw, blended into their zone: captured at zoom 30,
Stormwind's districts, harbour and Valley of Heroes, feathered into Elwynn.
### The traced outline was attempted and rejected, with a number
A city mask is "where the sheet has content, not blank parchment", which separates far better than
sea-against-land does — and unlike that case there are **three shipped masks to validate
against**, which makes it a fitting problem rather than a guess. So it was fitted: local-contrast
detail, threshold, close at quarter scale, largest connected blob, holes filled, dilate, blur,
swept over threshold x closing x blur.
The best it reached was **IoU 0.58** against the three traced masks, and the failure is not in the
number — it swallows the sheet's own torn frame and decorative corner, because a city sheet is
busy right out to its border where Orgrimmar's is mostly blank parchment. A 0.58 hull shipped as
if it were a trace would be a guess wearing an artist's clothes. The feather claims nothing it
cannot show.