From 08f6a0c1cec0eb308ed82f9cc9f262a8f82f53b0 Mon Sep 17 00:00:00 2001
From: Erik <erik.nihlen@gmail.com>
Date: Fri, 29 May 2026 12:20:59 +0200
Subject: [PATCH] =?UTF-8?q?docs(render):=20Phase=20A8.F=20=E2=80=94=20note?=
 =?UTF-8?q?=20why=20MarkAndPunchNdc=20omits=20DepthClamp=20(NDC=20z=3D0)?=
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---
 src/AcDream.App/Rendering/IndoorCellStencilPipeline.cs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/AcDream.App/Rendering/IndoorCellStencilPipeline.cs b/src/AcDream.App/Rendering/IndoorCellStencilPipeline.cs
index 4ee53e1..7958e44 100644
--- a/src/AcDream.App/Rendering/IndoorCellStencilPipeline.cs
+++ b/src/AcDream.App/Rendering/IndoorCellStencilPipeline.cs
@@ -308,6 +308,9 @@ public sealed unsafe class IndoorCellStencilPipeline : IDisposable
         _gl.Clear(ClearBufferMask.StencilBufferBit);
 
         // Step 1: mark bit 1.
+        // No DepthClamp here (unlike MarkAndPunch): MarkAndPunch draws world-space portal
+        // polygons that can fall outside [near,far]; these verts are already NDC with z=0,
+        // always within the depth range, so there is nothing to clamp.
         _gl.ColorMask(false, false, false, false);
         _gl.DepthMask(false);
         _gl.DepthFunc(DepthFunction.Always);