From 1498697bc59152cfb93c251db99623a6c78e331f Mon Sep 17 00:00:00 2001
From: Erik <erik.nihlen@gmail.com>
Date: Sun, 24 May 2026 18:14:29 +0200
Subject: [PATCH] =?UTF-8?q?diag(phys):=20[cyl-test]=20probe=20=E2=80=94=20?=
 =?UTF-8?q?log=20every=20Cylinder=20shadow=20collision=20test?=
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Adds a one-line diagnostic per Cylinder ShadowEntry tested in
FindObjCollisions, gated on ProbeBuildingEnabled. Useful for the
door-collision investigation surfaced 2026-05-24: tells us whether
the broadphase returned a candidate door AND what CylinderCollision
decided (OK / Collided / Adjusted / Slid).

Off in normal play (probe flag off by default). General-purpose; not
door-specific.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 src/AcDream.Core/Physics/TransitionTypes.cs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/AcDream.Core/Physics/TransitionTypes.cs b/src/AcDream.Core/Physics/TransitionTypes.cs
index 9749fdf..297edbf 100644
--- a/src/AcDream.Core/Physics/TransitionTypes.cs
+++ b/src/AcDream.Core/Physics/TransitionTypes.cs
@@ -2308,6 +2308,19 @@ public sealed class Transition
                 // the same 6-path dispatcher. For now we keep the swept-sphere
                 // cylinder test which matches the retail CylSphere behavior.
                 result = CylinderCollision(obj, sp);
+
+                // A6.P4 door investigation (2026-05-24): log every Cylinder
+                // shadow tested. Tells us whether the broadphase returned
+                // the door AND what CylinderCollision decided. Greppable
+                // alongside [entity-source] (which logs the door's radius
+                // / height at registration). Gated on ProbeBuildingEnabled.
+                if (PhysicsDiagnostics.ProbeBuildingEnabled)
+                {
+                    Vector3 dxy = obj.Position - sp.GlobalCurrCenter[0].Origin;
+                    float distXY = MathF.Sqrt(dxy.X * dxy.X + dxy.Y * dxy.Y);
+                    Console.WriteLine(System.FormattableString.Invariant(
+                        $"[cyl-test] obj=0x{obj.EntityId:X8} state=0x{obj.State:X8} radius={obj.Radius:F3} height={obj.CylHeight:F3} pos=({obj.Position.X:F2},{obj.Position.Y:F2},{obj.Position.Z:F2}) distXY={distXY:F3} result={result}"));
+                }
             }
 
             // L.2a slice 3: attribute the collision (if any) to this entity.