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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>
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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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19
docs/ISSUES.md
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@ -189,19 +189,22 @@ step-down boundaries, retail often slides along the boundary. acdream still
hard-blocks or accepts too much in several of these cases.
**Root cause / status:** Tracked under Phase L.2c. Wall-adjacent
`step_up_slide` now feels acceptable in live testing. L.2c plumbing now passes
the retail-default `EdgeSlide` flag into local and remote movement and logs
failed step-down edge cases behind `ACDREAM_DUMP_EDGE_SLIDE=1`. Remaining gap:
preserve walkable polygon context for `precipice_slide` and finish
`cliff_slide` / `NegPolyHit` dispatch. Named retail anchors include
`CTransition::edge_slide`, `CTransition::cliff_slide`,
`SPHEREPATH::precipice_slide`, and `SPHEREPATH::step_up_slide`.
`step_up_slide` now feels acceptable in live testing. Local/remote movement
passes the retail-default `EdgeSlide` flag. The first precipice-slide slice now
preserves terrain/BSP walkable polygon vertices and runs the retail back-probe
before `SPHEREPATH::precipice_slide`; `ACDREAM_DUMP_EDGE_SLIDE=1` now reports
whether a failed step-down had polygon context. Remaining gaps: real-DAT
building-edge fixtures, fuller `cliff_slide` coverage, and `NegPolyHit`
dispatch. Named retail anchors include `CTransition::edge_slide`,
`CTransition::cliff_slide`, `SPHEREPATH::precipice_slide`, and
`SPHEREPATH::step_up_slide`.
**Files:** `src/AcDream.Core/Physics/TransitionTypes.cs`,
`src/AcDream.Core/Physics/BSPQuery.cs`,
`tests/AcDream.Core.Tests/`.
**Research:** `docs/plans/2026-04-29-movement-collision-conformance.md`.
**Research:** `docs/plans/2026-04-29-movement-collision-conformance.md`,
`docs/research/2026-04-30-precipice-slide-pseudocode.md`.
**Acceptance:** Synthetic and real-DAT tests cover wall-slide, roof-edge slide,
cliff/precipice slide, failed step-up/step-down, and the jump-clears-edge case.