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feat(physics): add [indoor-walkable] probe line

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Extends the existing [indoor-bsp] probe surface in FindEnvCollisions
with a per-call [indoor-walkable] line gated on
PhysicsDiagnostics.ProbeIndoorBspEnabled (no new flag). Logs the
synthesized contact plane, the polyId hit, and the signed Z gap (dz)
between foot and plane.

Lets the visual-verification step distinguish "FindWalkableSphere
picked the right polygon" from "FindWalkableSphere returned a miss
and we fell through to outdoor-terrain backstop", which is critical
for triaging any remaining indoor collision oddities after the BSP
port lands.

Runtime-toggleable via the existing DebugPanel "Indoor BSP probe"
checkbox; zero cost when disabled.

Spec: docs/superpowers/specs/2026-05-19-indoor-walkable-plane-bsp-port-design.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Erik 2026-05-19 22:02:06 +02:00
parent 7c516edd7b
commit f845b2241a
1 changed files with 25 additions and 4 deletions
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29
src/AcDream.Core/Physics/TransitionTypes.cs
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@ -1383,10 +1383,31 @@ public sealed class Transition
// Retail: CEnvCell::find_env_collisions returns from the cell
// branch with the cell's walkable plane set — no fall-through
// to terrain.
if (TryFindIndoorWalkablePlane(cellPhysics, localCenter, sphereRadius,
out var indoorPlane,
out var indoorVertices,
out uint _))
bool walkableHit = TryFindIndoorWalkablePlane(
cellPhysics, localCenter, sphereRadius,
out var indoorPlane,
out var indoorVertices,
out uint hitPolyId);
if (PhysicsDiagnostics.ProbeIndoorBspEnabled)
{
if (walkableHit)
{
// dz = signed gap between foot and synthesized plane.
// Plane: N·p + D = 0 ⇒ pZ_on_plane = -D/N.z (for upward-facing planes)
// gap = foot.Z - pZ_on_plane = foot.Z - (-D/N.z) = foot.Z + D/N.z
float dz = footCenter.Z + indoorPlane.D / indoorPlane.Normal.Z;
Console.WriteLine(System.FormattableString.Invariant(
$"[indoor-walkable] cell=0x{sp.CheckCellId:X8} wpos=({footCenter.X:F3},{footCenter.Y:F3},{footCenter.Z:F3}) probe={INDOOR_WALKABLE_PROBE_DISTANCE:F2} result=HIT poly=0x{hitPolyId:X4} wn=({indoorPlane.Normal.X:F3},{indoorPlane.Normal.Y:F3},{indoorPlane.Normal.Z:F3}) wD={indoorPlane.D:F3} dz={dz:+0.00;-0.00;+0.00}"));
}
else
{
Console.WriteLine(System.FormattableString.Invariant(
$"[indoor-walkable] cell=0x{sp.CheckCellId:X8} wpos=({footCenter.X:F3},{footCenter.Y:F3},{footCenter.Z:F3}) probe={INDOOR_WALKABLE_PROBE_DISTANCE:F2} result=MISS"));
}
}
if (walkableHit)
{
return ValidateWalkable(
footCenter,