From 9daa2a9003696deea1001ca8967fbb01952b7156 Mon Sep 17 00:00:00 2001
From: kakkokari-gtyih <67428053+kakkokari-gtyih@users.noreply.github.com>
Date: Sun, 19 Oct 2025 16:24:49 +0900
Subject: [PATCH] =?UTF-8?q?fix:=20=E3=83=AA=E3=83=94=E3=83=BC=E3=83=88?=
 =?UTF-8?q?=E3=83=A2=E3=83=BC=E3=83=89=E6=99=82=E3=81=AE=E6=8B=A1=E5=A4=A7?=
 =?UTF-8?q?=E7=B8=AE=E5=B0=8F=E3=81=AE=E5=8E=9F=E7=82=B9=E3=81=8C=E3=80=81?=
 =?UTF-8?q?=E3=82=A2=E3=83=A9=E3=82=A4=E3=83=A1=E3=83=B3=E3=83=88=E3=81=AE?=
 =?UTF-8?q?=E8=A8=AD=E5=AE=9A=E3=81=AB=E3=81=8B=E3=81=8B=E3=82=8F=E3=82=89?=
 =?UTF-8?q?=E3=81=9A=E5=B7=A6=E4=B8=8A=E3=81=AB=E3=81=AA=E3=82=8B=E5=95=8F?=
 =?UTF-8?q?=E9=A1=8C=E3=82=92=E4=BF=AE=E6=AD=A3?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../src/utility/image-effector/fxs/watermarkPlacement.ts    | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/packages/frontend/src/utility/image-effector/fxs/watermarkPlacement.ts b/packages/frontend/src/utility/image-effector/fxs/watermarkPlacement.ts
index 28aa40931f..f3b93d47fa 100644
--- a/packages/frontend/src/utility/image-effector/fxs/watermarkPlacement.ts
+++ b/packages/frontend/src/utility/image-effector/fxs/watermarkPlacement.ts
@@ -110,9 +110,13 @@ void main() {
 		// アライメントに基づく中心で回転
 		vec2 q = rectCenter + rot(-theta) * (p - rectCenter);
 
+		// タイルグリッドの原点をrectMin（アライメント位置）に設定
+		vec2 gridOrigin = rectMin - margin;
+		vec2 qFromOrigin = q - gridOrigin;
+
 		// タイルサイズ(ウォーターマーク + マージン)で正規化
 		vec2 tile = wmSize + margin * 2.0;
-		vec2 tileUv = q / tile;
+		vec2 tileUv = qFromOrigin / tile;
 
 		// タイル内のローカル座標(0..1)を取得
 		vec2 localUv = fract(tileUv);