wgt01 Texture Kit & Design — Spec

Date: 2026-07-05 · Branch: wgt01-tileset-kit · Status: shipped & merged (see "As shipped" below; gaps tracked in 2026-07-05-wgt01-texture-kit-gaps.md)

Goal

Assemble the material/texture kit for wgt01 (Westgate Urban Foundation tileset): dark gothic ground grammar only — streets, sidewalks, plazas, curbs, gutters, raised tiers, ramps, canals, bridges. No buildings (placeables later). Palette and material language follow wgt01/concept-art-1.png (8 material slots) and wgt01/VIBE.md (noir dark fantasy, rain-slick, early industrial-magical shown only through ground grammar).

Approach (decided)

Hybrid curated, Procampur-first with a small internet pull:

Base structure from /home/vicky/Blender/PBR_Procampur (PBR retexture of stock tcn01 City set: _d/_h/_n maps + .mtr, NWN-correct tiling scale). Confirmed too grey-green/warm as-is → every diffuse gets a uniform regrade.
Fresh CC0 pulls (ambientCG / Polyhaven or similar) only for slots Procampur lacks: plaza slabs, possibly sidewalk flagstone and bridge arch stone.
pd textures main lib is fallback only (Roads is mostly modern asphalt; the dark pebble-cobble pattern is a candidate wet-cobble alternate).

Rejected: pure Procampur rename (not dark enough); all-internet (discards ready-made NWN conventions, most work).

Deliverables

wgt01/textures/ — the kit. Per material slot: wgt01_<slot>_d/_h/_n.tga (+ _s where available) and wgt01_<slot>.mtr. All resrefs ≤ 16 chars, wgt01_ namespace. No originals modified in /home/vicky/Blender.
wgt01/textures/SOURCES.md — per-file provenance + license notes (Procampur origin filename, or CC0 URL/asset id).
wgt01/regrade.sh (or small script) — the single ImageMagick recipe (levels + desaturate + cool tint, ~35% darken) applied to all diffuses so the kit shares one palette. Reproducible; height/normal maps pass through untouched; missing _s generated from darkened diffuse.
Materials wired into wgt01/wgt01.blend on the tile prototypes (named MAT_wgt01_<slot>, image-based, matching KICKOFF material roles).

Material slots

#	Slot (concept sheet)	Source	Notes
1	Wet cobblestone	`tcn01_cobb02` d/h/n	regrade; specular boosted for rain-slick
2	Worn stone / patches	`tcn01_cobb05`	regrade; broken/repair variant
3	Plaza stone (large slabs)	internet CC0 flagstone/slate	grade to palette
4	Curb / sidewalk stone	`tcn01_stone04` or internet flagstone	pick after regrade test
5	Retaining wall stone	`tcn01_brick03` + `tcn01_slum01`; `tcn01_watrstn02` waterline overlay near canals	regrade
6	Bridge stone	`tcn01_stone04`/`brick03` variant; internet arch stone if needed	regrade
7	Dark gutter / drain	`tcn01_grate01`/`grill01` iron + darkened stone channel	near-black, wet; grate01 is DDS-only → convert
8	Canal / dark water	authored near-black water diffuse; `.set` `EnvMap`	`tcn01_water01` too green; animation later

Grime layer (not a slot): tcn01_splotch*/stain* alpha decals reused as-is.

Tile grammar (context, unchanged)

Prefix wgt01; terrains cobble / plaza / canal; crossers street / sidewalk / canal_edge; Transition=1.5; raised tier = cobble at corner height 1 (not a terrain). Kept minimal per the terrain-pairing cost rule in root AGENTS.md §2.1. Canal water sits at Z = −0.3 under a non-walkable walkmesh.

Out of scope

Buildings/facades/props; .set/.itp/.mdl emission (twu01 generator kit is the reference when we get there); water animation; minimaps; hak packing.

Verification

Contact sheet (ImageMagick montage) of all regraded diffuses next to concept-art swatches — visual palette check.
Every slot has _d/_h/_n + .mtr, names ≤ 16 chars, TGA (no stray DDS).
wgt01.blend opens in Blender 4.0.2 with all MAT_wgt01_* images resolving (relative paths into wgt01/textures/).
SOURCES.md covers every shipped file.

As shipped (current truth, post-merge)

Deviations from the table above; everything else landed as specced:

No _s maps anywhere — .mtr uses texture2 pointing at a shared black, texture4 _h. The "generate _s from darkened diffuse" idea was dropped.
Slot 4 sidewalk = tcn01_stone04 (the internet-flagstone option lost).
Slot 5 wall = tcn01_brick03 only; no slum01 blend. Waterline is a separate decal wgt01_wtrline_d.
Slot 6 bridge shares tcn01_stone04 with sidewalk, differentiated by a darker/cooler regrade (MOD=42,40,105 TINT=#1c2436 TINTPCT=22); its _n/_h are still sidewalk's — replace only if it reads wrong in-engine.
Slot 7 gutter = extra-dark cobble regrade; the iron grate is a separate 32-bit decal wgt01_grate_d (DDS converted via nwn_crunch, not ImageMagick).
Slot 8 water = authored near-black diffuse + wgt01_water_d.txi with the standard bumpyshiny template (ttr01__env / shinywater), no .mtr and no .set EnvMap dependency.
Full provenance in wgt01/textures/SOURCES.md; palette check in wgt01/textures/contact-sheet.png.

Risks

Regrade recipe may need per-slot tweaks; keep overrides in the script, not hand-edited images.
Internet pulls are network-dependent and need license capture at download time.
Procampur's own redistribution license should be checked before the kit ships in a public .hak; fine for internal prototyping.

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