docs: ADR — shared geometry, separate collision detection (B4, D4)#158
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Records the deliberate decision (from the v0.14 API review) NOT to unify the two collision systems: core SAT (single MTV, immediate-mode, picking/gameplay) and the physics narrow-phase (Manifold with contact points + feature IDs, solver warm-start) have incompatible output and allocation models. Geometry concepts may be shared narrowly; detection stays split; physics stays an optional peer dependency and never enters the core picking path. Closes the D4 "one collision system" thread so it is not re-litigated each audit.
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B4 — D4 collision-duplication ADR (v0.14 wave 1)
Records the deliberate decision (from
01-api-ux-review§8) NOT to unify the two collision systems. Core SAT (single MTV, immediate-mode — picking/gameplay overlap) and the physics narrow-phase (Manifoldwith contact points + feature IDs — solver warm-start) have incompatible output and allocation models. Geometry concepts may be shared narrowly; detection stays split; physics stays an optional peer dependency and never enters the core picking path.New
docs/decisions/ADR directory. Doc-only.