khallaandClaude Opus 5.5
32f953fc01
The game drew 2x2 px red dots per visited-sector neighbour (0x6c8580), in 64-tile steps and unrelated to the explored mask. Replaced by lines traced from the explored cells (2x2 tiles), simplified to 0.75 px, rebuilt while the map is open when the masks change. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
66 lines
3.4 KiB
Markdown
66 lines
3.4 KiB
Markdown
# Map reveal (fog of war)
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## Request (2026-10-25)
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"Can we increase the base vision range (for map fog of war reveal) by x10 or
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so?"
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## Measured
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- Each sector (64x64 tiles) keeps a 32x32 bit mask at +0x180 (128 bytes, one
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bit per 2x2 tiles): `Sector_SetExplored` 0x622bf0, copied out by 0x622c60,
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loaded from the save by 0x622c80 (0x606ae0). The zoomed map view turns it
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into its fog texture (FOGOFWAR01.TGA, 0x639030).
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- `World_SetExplored` 0x638f00 (thiscall on `*0xad14e0`, (tile x, tile y,
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explored), ret 0xc) finds the tile's sector; tiles >= 0x2000 and sectors
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that aren't loaded are ignored.
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- `RevealAroundHero` 0x599730 (creature thiscall (tile x, tile y, sight), ret
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0xc), called from about ten places in the creature code: only for the local
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hero, only when its tile changed (last tile 0xad2384 / 0xad2388), it calls
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`World_SetExplored` for every tile of a stamp centred on the hero. Sight 0:
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the 29x29 circle at 0x88f5cc (radius 14 tiles). The callers choose 1 or 2
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from the weather object (0x417e50: +0x9e0c set -> 2, 0x41ba90 true -> 1);
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those use the 15x15 stamps at 0x88f328 + (sight - 1) * 225 (radius 7, 5;
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a third one, radius 3, is unused).
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## Mod (`mods/mapreveal.cpp`)
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After the original revealed at a new tile, the same stamp scaled up 10x is
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revealed too, one cell (2x2 tiles) at a time through `World_SetExplored`: by
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day a circle of about 140 tiles radius, at night / in fog 70 / 50. About 15000
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cells per tile step by day. Sectors beyond the loaded ones are not marked.
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## Creatures on the map (2026-10-25)
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"Enemies on the TAB map don't show unless in very short range." The zoomed
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map view (0x6cc950, large map and TAB map) draws a creature off explored
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ground, or a hostile one, only within a sight range of the hero: |dx| and |dy|
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(world units, about 53.7 per tile) against a float at [esp+14h], 650 by
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default (0x6ce677), 300 where 0x63d280 holds for the hero's area (0x6ce6b5),
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350 when the weather object's 0x41ba40 is false (0x6ce6cf), plus a skill
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(0x355, 0x570d90) and equipment bonuses. Out of range only the debug flag
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0x182cdb8 & 2 shows them. The mod scales the three base values by 10 as well
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(about 120 tiles by day). The view only lists creatures of the sectors around
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the hero (25 entries at [esp+1ech]).
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## Border line on the large map (2026-10-26)
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"The red outline on the mega map is choppy and feels weird."
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Measured (disassembly): `cUI_Megamap::DrawVisitedBorder` 0x6c8580 drew a
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2x2 px red dot (0xffff0000) per bit of a 100x100 byte grid (world +0xb73c):
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unvisited sectors next to visited ones (sector flag 0x20000, set when the
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hero's sector becomes the centre of the active 3x3, 0x626603), one bit per
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visited neighbour, the dot 10 / 20 px from the sector origin towards it.
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Built on load by 0x633230 and per sector change by 0x6332d0 / 0x6334f0. So:
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dots in 64-tile steps, following the sectors stood in rather than the
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explored mask the fog shows.
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Mod (`mods/mapborder.cpp`): the draw is replaced. The sides between explored
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and unexplored cells (2x2 tiles) of the 100x100 map sectors are chained into
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polylines (clockwise around explored cells; at a corner touch the chain turns
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right), projected with `WorldToMapPixel` (linear), simplified to 0.75 px
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(Douglas-Peucker) and drawn as 2 px red lines. Rebuilt while the map is open
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when the masks change (checked every 250 ms). Cells of missing sectors count
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as neither explored nor unexplored, so no line runs along the world's edge.
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