# RND — Rendering and Graphics

## Цель

Воспроизвести визуальные правила WoW 3.3.5a и дать opt-in улучшения, сохранив frame pacing на больших мирах Godot.

## RND-1. Renderer architecture

- `WorldRenderFacade` принимает focus, environment snapshot и entity presentation commands.
- `StreamingTargetPlanner` вычисляет desired state без Node creation.
- `RenderBudgetScheduler` ограничивает main-thread finalize по типам операций.
- Terrain, M2, WMO, liquid, sky, character, effects и debug overlays — отдельные services.
- RenderingServer/RIDs применяются только там, где profiler доказал overhead scene tree.
- Ownership каждого RID и cache entry документируется; world unload проверяет leaks.

## RND-2. World streaming

- WDT-driven tile catalog, priority по position/direction/velocity/camera frustum.
- Prewarm, retain и hysteresis исключают churn на ADT boundaries.
- Separate budgets для I/O, parse, mesh/material load, main-thread attach и eviction.
- Cold/warm cache scenarios, teleport, rapid flight и camera rotation stress.
- Cancellation stale jobs при teleport/map change.
- Streaming focus не обязан быть Camera3D: player, spectator, editor viewport, capture tool.

## RND-3. Terrain

- Точная 145-vertex MCNK topology, holes, normals и coordinate seams.
- Texture layer order, MCAL alpha variants, animation flags, repeat и mip behavior.
- Control-splat/array implementation как Godot optimization с fidelity tests.
- WDL/distant terrain и hierarchical LOD.
- Terrain collision/query representation отдельно от visual mesh.
- Editing path: sculpt, smooth, flatten, holes, texture paint, seam repair и rebake.

## RND-4. M2

- Static geometry, SKIN batches, blend modes, flags, UV transforms и texture lookup.
- Native pivot-based skeletal animation, bone palettes, global sequences и animation lookup.
- Billboards, attachments, key bones, events, cameras и bounding volumes.
- Particles, ribbons, texture animation и material combiners.
- Static doodads группировать spatial MultiMesh cells; animated/interactive entities не смешивать со static batching.
- MultiMesh buffer updates выполнять батчем; cell size выбирать по culling, а не только draw-call minimum.

## RND-5. WMO

- Root/group materials, batches, vertex colors, multiple UV sets и doodad sets.
- Portals/rooms, indoor/outdoor, BSP/collision, fog и group visibility.
- MLIQ, skybox, lights и ambient color semantics.
- Lightweight render cache для больших WMO и incremental group attach.
- Editor tools для group/portal/doodad validation.

## RND-6. Characters and creatures

- Race/gender/customization from DBC.
- Geosets, skin regions, hair/facial features и composited textures.
- Equipment component models/textures, attachment points, sheath, enchant visuals.
- Animation state resolver: locomotion, combat, casting, emotes, death, swim, mount, vehicle.
- CreatureDisplayInfo/Extra/ModelData, NPC equipment, pets и shapeshift.
- Character preview uses same presenter as world runtime.

## RND-7. Liquids

- MH2O/MCLQ layers, existence masks, heights, depth и liquid type.
- Отдельные profiles water/ocean/magma/slime.
- Blizzlike material: texture animation, alpha, lighting и fog behavior.
- Enhanced material: normals, reflections, depth/shore blending — opt-in.
- Liquid collision/swim state принадлежит gameplay/physics query, не shader.

## RND-8. Environment

- DBC-driven Light/LightParams/LightIntBand/LightFloatBand interpolation.
- Server time, day/night, zone/subzone transitions.
- Skyboxes, fog, ambient/directional light, weather visual state.
- Blizzlike cheap shadow policy; enhanced selective character/object shadows отдельно.
- Camera far plane, fog и streaming distances согласованы профилем.

## RND-9. Effects and presentation

- SpellVisual/SpellVisualKit-driven cast/impact/aura effects.
- Projectiles, decals, dynamic objects, combat text и selection circles.
- Weather particles и world emitters.
- Cinematic/model cameras и loading transitions.
- Effects have pooling, lifetime, visibility и per-frame budgets.

## RND-10. Graphical extensions

- Higher-resolution content overlays без модификации originals.
- Anisotropy, extended draw distance, improved water/shadows, post-processing и upscaling.
- Optional PBR approximation only when it does not replace Blizzlike material profile.
- Graphics settings expose measurable cost and fallback.
- Editor comparison viewport: Blizzlike/Enhanced side-by-side, screenshot и metric capture.

## Verification

- Paired checkpoints с original 3.3.5a по position/time/weather/camera.
- Material/animation fixtures from independent references.
- Perceptual diff плюс human approval для intentional deviations.
- p50/p95/p99, max hitch, draw calls, visible objects, GPU/CPU memory и RID leak checks.
- D3D12/Vulkan and quality profile matrix.

## Gate

Видимый мир не деградирует при декомпозиции; under-foot/near-field quality готова до появления в кадре; long traversal не создаёт recurring hitches/leaks; Enhanced всегда отключаем.
