docs(decisions): atlas-to-tile derivation model — D-227/D-228 + Q-100..105
Atlas-derivation workshop output (Jeroen + Tyre / Nigel / Burnelli / Gestalt).
The foundational world-derivation model:
- D-227 deterministic-rebuild world model: world = pure function of seed+atlas,
derived on demand + cached, only tile mutators persisted, fully volumetric
(voxel / subvoxel), vertical extent physical not floor-count, variable-height
floors (cave/basement/built all count).
- D-228 composite tile schema: orthogonal axes (TerrainMaterial / FloorMaterial /
Vegetation / Water / elevation), derived shape + tactical form, region-level
morphology zones, cohesion matrix, dynamic clock-bound region seasonal state
(water-height / snow / weather / crop-cycle from one cheap per-region calc).
- Q-100..Q-105: biome authority, refinement contract (+ body-class river density
+ ocean mask), cohesion-matrix algorithm, mutator op schema, floor-to-voxel-z
mapping, region seasonal/clock state.
- Workshop brief: docs/workshops/atlas-derivation-model.md.
Epic #974 + ocean-mask story #975 track implementation (Phase 4 milestone).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.7
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