From fee878f292acd0630eda28f37b627423cfb6bb8f Mon Sep 17 00:00:00 2001
From: Erik <erik.nihlen@gmail.com>
Date: Tue, 26 May 2026 07:39:31 +0200
Subject: [PATCH] =?UTF-8?q?feat(render):=20Phase=20A8=20=E2=80=94=20Loaded?=
 =?UTF-8?q?Cell.PortalPolygons=20field?=
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First slice of the indoor-cell visibility culling pipeline (#78). Adds
PortalPolygons: List<Vector3[]> to LoadedCell, parallel-indexed to the
existing Portals + ClipPlanes lists. Empty arrays for portals whose
polygon could not be resolved. Field is populated in Task 2.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 src/AcDream.App/Rendering/CellVisibility.cs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/AcDream.App/Rendering/CellVisibility.cs b/src/AcDream.App/Rendering/CellVisibility.cs
index bcca4ec..b4debbc 100644
--- a/src/AcDream.App/Rendering/CellVisibility.cs
+++ b/src/AcDream.App/Rendering/CellVisibility.cs
@@ -56,6 +56,20 @@ public sealed class LoadedCell
     /// Derived from portal polygon geometry during cell preparation.
     /// </summary>
     public List<PortalClipPlane> ClipPlanes = new();
+
+    /// <summary>
+    /// Portal polygon vertices in cell-local space, one Vector3[] per
+    /// <see cref="CellPortalInfo"/> entry in <see cref="Portals"/>. Index i
+    /// in this list corresponds to index i in <see cref="Portals"/> and
+    /// <see cref="ClipPlanes"/>. An empty array means the portal's polygon
+    /// could not be resolved at load time (degenerate cell or missing
+    /// polygon entry).
+    /// <para>
+    /// Used by the Phase A8 indoor-cell stencil pipeline to build a
+    /// per-frame triangle-fan mesh for portal silhouette masking.
+    /// </para>
+    /// </summary>
+    public List<Vector3[]> PortalPolygons = new();
 }
 
 /// <summary>