diff --git a/resources/views/rd/fire-shutter-drawing/index.blade.php b/resources/views/rd/fire-shutter-drawing/index.blade.php
index f6b8d3d9..16ef1a39 100644
--- a/resources/views/rd/fire-shutter-drawing/index.blade.php
+++ b/resources/views/rd/fire-shutter-drawing/index.blade.php
@@ -314,8 +314,8 @@
                         <!-- 개폐율: 한 행 -->
                         <div class="flex items-center gap-2 mb-1">
                             <label class="text-[10px] text-slate-500 font-bold shrink-0" style="width:24px;">개폐</label>
-                            <input type="range" id="shutterPos" min="0" max="100" value="100" class="flex-1 accent-blue-500" style="height:3px;" oninput="fs3dShutterPos(this.value)">
-                            <span id="shutterPosLabel" class="text-[10px] text-blue-400 font-black shrink-0" style="width:28px;text-align:right;">100%</span>
+                            <input type="range" id="shutterPos" min="0" max="100" value="50" class="flex-1 accent-blue-500" style="height:3px;" oninput="fs3dShutterPos(this.value)">
+                            <span id="shutterPosLabel" class="text-[10px] text-blue-400 font-black shrink-0" style="width:28px;text-align:right;">50%</span>
                         </div>
                         <!-- 투명도: 한 행 -->
                         <div class="flex items-center gap-2 mb-2">
@@ -463,7 +463,7 @@
         // Shutter Box
         sb: { width:2280, height:380, depth:500, thickness:1.6, shaftDia:102, railWidth:70, frontBottom:50, bracketW:10, motorSide:'right', doorDir:'dual', viewMode:'side', showShaft:true, showSlatRoll:true, showMotor:true, showBrake:true, showSpring:true },
         // 3D
-        td: { shutterPos:100, caseOpacity:0.3, lightPreset:'default', bgColor:'#ffffff', show:{ case:true, shaft:true, motor:true, rails:true, slats:true, bottomBar:true, wall:false, slatRoll:true } },
+        td: { shutterPos:50, caseOpacity:0.3, lightPreset:'default', bgColor:'#ffffff', show:{ case:true, shaft:true, motor:true, rails:true, slats:true, bottomBar:true, wall:false, slatRoll:true } },
         // Wall (벽체)
         wall: { wing:600, thick:600, topMargin:300, color:'#a1887f', opacity:30 },
         // View