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fix(physics): #32 L.2c precipice edge-slide context

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Port the first retail precipice-slide slice from named retail/ACE: terrain and BSP walkable hits now preserve polygon vertices, failed step-down edges back-probe to rediscover the walkable polygon, and edge-slide can run precipice/cliff slide instead of only hard-stopping.

Adds pseudocode anchors plus regression coverage for terrain polygon context and loaded-terrain boundary edge-slide.

Co-authored-by: Codex <codex@openai.com>
This commit is contained in:
Erik 2026-04-30 08:04:37 +02:00
parent 1ec40f2a4f
commit 261322b48e
10 changed files with 559 additions and 60 deletions
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12
memory/project_movement_collision_conformance.md
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@ -62,5 +62,13 @@ InputDispatcher / PlayerMovementController
- 2026-04-30: L.2c edge-slide plumbing. User live-tested wall-adjacent slide as
acceptable. Local player and remote dead-reckoning now pass retail-default
`ObjectInfoState.EdgeSlide`; `ACDREAM_DUMP_EDGE_SLIDE=1` logs failed
step-down edge cases so the next slice can distinguish missing walkable
polygon context from cliff-slide/NegPolyHit gaps.
step-down edge cases and now reports whether walkable polygon context is
present before cliff/precipice handling.
- 2026-04-30: L.2c precipice-slide context. Named retail
`SPHEREPATH::precipice_slide` and ACE `Polygon.find_crossed_edge` are now
captured in `docs/research/2026-04-30-precipice-slide-pseudocode.md`.
Terrain supplies exact walkable triangle vertices, BSP step-down/find-walkable
stores world-space walkable vertices for static object tops, and failed
step-down edge cases run the retail back-probe before precipice slide.
`cliff_slide` has a first port, but `NegPolyHit`, `CELLARRAY`, full
`cell_bsp`, and real-DAT building portal conformance remain open L.2 work.