diff --git a/resources/views/rd/fire-shutter-drawing/index.blade.php b/resources/views/rd/fire-shutter-drawing/index.blade.php
index c9a978da..b7e015d6 100644
--- a/resources/views/rd/fire-shutter-drawing/index.blade.php
+++ b/resources/views/rd/fire-shutter-drawing/index.blade.php
@@ -1492,33 +1492,47 @@ function fs3dBuild() {
         scene.add(meshes.bottomBar);
 
         // === WALL (좌/우 기둥 + 상부 인방) ===
-        // 기둥: 하나의 통 박스 (바닥~전체높이, 개구부 양옆)
-        // 인방: 셔터박스 윗면부터 위로만 (셔터박스 내부 침범 안 함)
+        // 벽체: 기둥+인방을 하나의 U자 형상으로 생성 (이음새 없음)
         const wl = S.wall;
-        const wallH = H + b.height + wl.topMargin;
+        const colH = H + b.height;
         const wallColor = new THREE.Color(wl.color);
         const wallMat = new THREE.MeshStandardMaterial({ color: wallColor, transparent: true, opacity: wl.opacity / 100, side: THREE.DoubleSide });
         meshes.wall = new THREE.Group();
 
-        // 좌/우 기둥 (바닥~셔터박스 윗면까지, 인방과 겹치지 않게)
-        const colH = H + b.height; // 기둥 높이: 인방 아래까지
-        if (wl.wing > 0) {
-            const colGeo = new THREE.BoxGeometry(wl.wing, colH, wl.thick);
+        const hw = W1 / 2;
+        const wg = wl.wing;
+        const topH = wl.topMargin;
+        const totalH = colH + topH;
+
+        if (wg > 0 && topH > 0) {
+            // U자 형상 (기둥+인방 일체형)
+            const shape = new THREE.Shape();
+            shape.moveTo(-hw - wg, 0);
+            shape.lineTo(-hw - wg, totalH);
+            shape.lineTo(hw + wg, totalH);
+            shape.lineTo(hw + wg, 0);
+            shape.lineTo(hw, 0);
+            shape.lineTo(hw, colH);
+            shape.lineTo(-hw, colH);
+            shape.lineTo(-hw, 0);
+            shape.lineTo(-hw - wg, 0);
+            const wallGeo = new THREE.ExtrudeGeometry(shape, { depth: wl.thick, bevelEnabled: false });
+            wallGeo.translate(0, 0, -wl.thick / 2);
+            meshes.wall.add(new THREE.Mesh(wallGeo, wallMat));
+        } else if (wg > 0) {
+            // 기둥만 (인방 없음)
+            const colGeo = new THREE.BoxGeometry(wg, colH, wl.thick);
             const leftCol = new THREE.Mesh(colGeo, wallMat);
-            leftCol.position.set(-W1 / 2 - wl.wing / 2, colH / 2, 0);
+            leftCol.position.set(-hw - wg / 2, colH / 2, 0);
             meshes.wall.add(leftCol);
-
             const rightCol = new THREE.Mesh(colGeo.clone(), wallMat);
-            rightCol.position.set(W1 / 2 + wl.wing / 2, colH / 2, 0);
+            rightCol.position.set(hw + wg / 2, colH / 2, 0);
             meshes.wall.add(rightCol);
-        }
-
-        // 상부 인방 (셔터박스 윗면~topMargin, 기둥 포함 전체 폭)
-        if (wl.topMargin > 0) {
-            const totalW = W1 + wl.wing * 2;
-            const lintelGeo = new THREE.BoxGeometry(totalW, wl.topMargin, wl.thick);
+        } else if (topH > 0) {
+            // 인방만 (기둥 없음)
+            const lintelGeo = new THREE.BoxGeometry(W1, topH, wl.thick);
             const lintel = new THREE.Mesh(lintelGeo, wallMat);
-            lintel.position.set(0, colH + wl.topMargin / 2, 0);
+            lintel.position.set(0, colH + topH / 2, 0);
             meshes.wall.add(lintel);
         }