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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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docs/plans/2026-04-29-movement-collision-conformance.md
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@ -118,6 +118,13 @@ precipices.
edge, walkable, and collision rules; jumping clears `OnWalkable` and only
succeeds when the airborne path actually clears geometry.
Current shipped slice (2026-04-30): wall-adjacent `step_up_slide` feels
acceptable in live testing; player/remote movers pass `EdgeSlide`; terrain and
BSP step-down/find-walkable now preserve walkable polygon vertices; failed
step-down edge cases perform the retail back-probe before
`SPHEREPATH::precipice_slide`. Remaining L.2c work is real-DAT building-edge
fixtures, fuller `cliff_slide` coverage, and `NegPolyHit` dispatch.
### L.2d - Shape Fidelity: Sphere / CylSphere / Building Objects
Goal: object collisions use retail shape semantics, not one simplified