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fix(physics): Cluster A #84 + #85 — indoor cell tracking

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ResolveOutdoorCellId only resolved outdoor terrain landcells. A player
geometrically inside an EnvCell stayed in outdoor-landcell range, so
FindEnvCollisions' indoor cell-BSP branch (gated on cellLow >= 0x0100)
never fired. Both #84 (blocked by air indoors) and #85 (pass through
walls outside→in) are downstream of this — without indoor cell-BSP
collision the player gets stuck against outdoor-stab back-faces of the
building shell, and walls only block from one side.

Adds an indoor-cell-containment check via PhysicsDataCache: at
CacheCellStruct time, compute each cell's local AABB from its resolved
polygon vertices; at ResolveOutdoorCellId time, transform the world
position into each cached cell's local space and return the matched
cell's full id when contained. Falls through to the existing outdoor
terrain logic when no EnvCell contains the position.

Also fixes a pre-existing prefix-preservation bug in the outdoor branch:
the function now always applies the matched landblock's high-16 prefix
even when the input fallbackCellId arrived bare-low-byte (the L.2e
finding from CLAUDE.md). Updated two existing PhysicsEngineTests that
encoded the old bare-low-byte output.

Evidence: launch-cluster-a-capture.log @ 2026-05-19 — player at
worldPos (155.376, 14.010, 94.000) geometrically inside cottage cell
0xA9B40172, but sp.CheckCellId stuck at 0x00000031 (outdoor landcell)
across 454 [resolve] lines; zero [indoor-bsp] lines because the gate
never opened.

Closes #84.
Closes #85.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erik 2026-05-19 15:20:36 +02:00
parent 4e308d567a
commit c19d6fb321
4 changed files with 292 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

10
tests/AcDream.Core.Tests/Physics/PhysicsEngineTests.cs
View file

@ -207,7 +207,10 @@ public class PhysicsEngineTests
Assert.True(result.IsOnGround);
Assert.InRange(result.Position.X, 24.9f, 25.1f);
Assert.Equal(0x0009u, result.CellId);
// Phase D fix: ResolveOutdoorCellId now always applies the matched
// landblock's high-16 prefix — 0xA9B4 prefix from the registered
// landblock (0xA9B4FFFF) is now included in the returned CellId.
Assert.Equal(0xA9B40009u, result.CellId);
}
[Fact]
@ -228,7 +231,10 @@ public class PhysicsEngineTests
Assert.True(result.IsOnGround);
Assert.InRange(result.Position.X, 97.9f, 98.1f);
Assert.Equal(0x0025u, result.CellId);
// Phase D fix: ResolveOutdoorCellId now always applies the matched
// landblock's high-16 prefix — 0xA9B4 prefix from the registered
// landblock (0xA9B4FFFF) is now included in the returned CellId.
Assert.Equal(0xA9B40025u, result.CellId);
}
[Fact]