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Kelsidavis-WoWee/tools/editor/FORMAT_SPEC.md
Kelsi b736c6b2e1 feat(wom): add WOM3 multi-batch format for material-aware models 
WOM1/WOM2 had a single mesh with one texture, which lost the multi-submesh
structure of complex M2 models (body+hair+eyes+armor each need different
textures and blend modes).

WOM3 adds a Batch array: each batch has indexStart/indexCount + a textureIndex
into texturePaths + blendMode + flags. Loader is fully backward compatible:
WOM1/WOM2 files still load, and WOM3 with no batches block falls back to a
single full-mesh batch. fromM2 now extracts batches with materials, and toM2
emits matching M2 batches so the renderer can draw them correctly.
2026-05-06 01:07:00 -07:00

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Wowee Open Format Specification v1.1

Novel file formats for custom WoW zone content. No Blizzard IP.

WOT — Wowee Open Terrain (JSON metadata)

  • Extension: .wot
  • Contains: tile coords, texture list, per-chunk layers/holes, water data, doodad placements (M2 objects), WMO placements (buildings)
  • Key: "format": "wot-1.0"
  • Placement fields: doodadNames[], doodads[] (nameId, uniqueId, pos, rot, scale, flags)
  • WMO fields: wmoNames[], wmos[] (nameId, uniqueId, pos, rot, flags, doodadSet)

WHM — Wowee HeightMap (binary)

  • Extension: .whm
  • Magic: WHM1 (0x314D4857)
  • Layout: magic(4) + chunks(4) + vertsPerChunk(4) + per-chunk data × 256
  • Per-chunk: baseHeight(4) + heights145 + alphaSize(4) + alphaData(alphaSize)
  • Alpha data: raw alpha blend maps for texture layers (same format as ADT MCAL)
  • Backward compatible: older WHM files without alpha data still load (alphaSize=0)

WOM — Wowee Open Model (binary)

  • Extension: .wom
  • Magic: WOM1 (0x314D4F57) static, WOM2 (0x324D4F57) animated, WOM3 (0x334D4F57) multi-batch
  • Layout: magic(4) + vertCount(4) + indexCount(4) + texCount(4) + bounds(28) + name + vertices + indices + texPaths
  • WOM1 Vertex: position(vec3) + normal(vec3) + texCoord(vec2) = 32 bytes
  • WOM2/WOM3 Vertex: + boneWeights(4) + boneIndices(4) = 40 bytes
  • WOM2/WOM3 Bones: boneCount(4) + [keyBoneId(4) + parentBone(2) + pivot(12) + flags(4)] × N
  • WOM2/WOM3 Animations: animCount(4) + [id(4) + duration(4) + speed(4) + per-bone keyframes] × N
  • Keyframe: timeMs(4) + translation(12) + rotation(16) + scale(12) = 44 bytes
  • WOM3 Batches: batchCount(4) + [indexStart(4) + indexCount(4) + textureIndex(4) + blendMode(2) + flags(2)] × N
  • WOM3 blendMode: 0=opaque, 1=alpha-test, 2=alpha, 3=add, 4=mod, 5=mod2x, 6=blendAdd, 7=screen
  • WOM3 flags: bit 0 = unlit, bit 1 = two-sided, bit 2 = no z-write
  • Backward compatible: WOM1 files load without bone/animation data; WOM3 falls back to single-batch when batches block missing

WOB — Wowee Open Building (binary)

  • Extension: .wob
  • Magic: WOB1 (0x31424F57)
  • Layout: magic(4) + groupCount(4) + portalCount(4) + doodadCount(4) + bounds(4) + name + groups + portals + doodads
  • Group: name + vertexCount(4) + indexCount(4) + texCount(4) + outdoor(1) + bounds(24)
    • vertices(pos+normal+uv+color) + indices + texPaths + materialCount(4) + materials
  • Material: texturePath + flags(4) + shader(4) + blendMode(4)
  • Doodad: modelPath + position(12) + rotation(12) + scale(4)
  • Portal: groupA(4) + groupB(4) + vertexCount(4) + vertices

WCP — Wowee Content Pack (archive)

  • Extension: .wcp
  • Magic: WCP1 (0x31504357)
  • Layout: magic(4) + fileCount(4) + infoJsonSize(4) + infoJSON + [pathLen(2) + path + dataSize(4) + data] × N
  • Info JSON includes categorized file list (terrain/model/building/texture/data)

zone.json — Map Definition

  • Replaces WDT
  • Fields: mapName, displayName, mapId, biome, baseHeight
  • hasCreatures, description, tiles array, files map
  • doodadNames[], doodads[], wmoNames[], wmos[] for placed objects
  • editorVersion for compatibility tracking

JSON DBC — Data Table Replacement

  • Replaces binary DBC files
  • Format: {"format": "wowee-dbc-json-1.0", "records": [...], "fieldCount": N}
  • Records are arrays of mixed types: integers, floats, strings
  • Client loads via DBCFile::loadJSON() when found in custom_zones/ or output/

PNG Textures — Texture Replacement

  • Replaces BLP texture files
  • Standard PNG format, loaded by client's texture override system
  • Editor auto-converts BLP→PNG on export via stb_image_write

WOC — Wowee Open Collision (binary)

  • Extension: .woc
  • Magic: WOC1 (0x31434F57)
  • Layout: magic(4) + triCount(4) + tileX(4) + tileY(4) + boundsMin(12) + boundsMax(12) + triangles
  • Triangle: v0(12) + v1(12) + v2(12) + flags(1) = 37 bytes
  • Flags: 0x01=walkable, 0x02=water, 0x04=steep, 0x08=indoor
  • Generated from terrain heightmap with slope classification (50 deg threshold)
  • Respects terrain holes (skips triangles in hole regions)

Terrain Stamps (.json)

  • Portable terrain feature snapshots (mountains, craters, etc.)
  • Format: {"format": "wowee-stamp-1.0", "vertices": [[dx, dy, height], ...]}
  • Can be saved/loaded across zones and sessions

Open Format Scoring (0-7)

  1. WOT terrain metadata present
  2. WHM heightmap with valid magic
  3. zone.json map definition
  4. PNG textures present
  5. WOM models with valid magic
  6. WOB buildings with valid magic
  7. WOC collision mesh with valid magic

All formats are novel, portable, and open for redistribution.

No Blizzard intellectual property is used in any format definition.