diff --git a/resources/views/rd/fire-shutter-bim-viewer/index.blade.php b/resources/views/rd/fire-shutter-bim-viewer/index.blade.php
index 0c1d6051..b6f230b7 100644
--- a/resources/views/rd/fire-shutter-bim-viewer/index.blade.php
+++ b/resources/views/rd/fire-shutter-bim-viewer/index.blade.php
@@ -978,8 +978,6 @@ function FireShutterBimApp() {
         sceneRef.current?.screenshot();
     }, []);
 
-    if (!params) return null;
-
     return (
         <div style={{margin:'-24px',height:'calc(100vh - 64px)',background:'#020617',display:'flex',flexDirection:'column',overflow:'hidden'}}>
             {/* 상단 헤더 */}
@@ -989,21 +987,27 @@ className="px-5 py-2.5 flex items-center gap-4 flex-shrink-0">
                     <i className="ri-fire-line text-red-400 text-lg"></i>
                     <h1 className="text-white text-base font-black">방화셔터 BIM 뷰어</h1>
                 </div>
-                <span className="text-slate-500 text-[11px]">|</span>
-                <span className="text-slate-400 text-[11px] font-bold">
-                    {PRODUCT_DEFAULTS[params.productType].label} &middot; {params.openWidth} x {params.openHeight}mm
-                </span>
+                {params && (
+                    <>
+                        <span className="text-slate-500 text-[11px]">|</span>
+                        <span className="text-slate-400 text-[11px] font-bold">
+                            {PRODUCT_DEFAULTS[params.productType].label} &middot; {params.openWidth} x {params.openHeight}mm
+                        </span>
+                    </>
+                )}
             </div>
 
             {/* 메인 영역 */}
             <div className="flex flex-1" style={{minHeight:0}}>
                 {/* 좌측 파라미터 패널 */}
-                <div style={{width:'280px',background:'rgba(15,23,42,0.85)',borderRight:'1px solid rgba(255,255,255,0.1)',backdropFilter:'blur(12px)'}}
-                    className="p-3 overflow-y-auto custom-scrollbar flex-shrink-0">
-                    <ParamPanel params={params} onParamChange={handleParamChange} onRebuild={handleRebuild} />
-                </div>
+                {params && (
+                    <div style={{width:'280px',background:'rgba(15,23,42,0.85)',borderRight:'1px solid rgba(255,255,255,0.1)',backdropFilter:'blur(12px)'}}
+                        className="p-3 overflow-y-auto custom-scrollbar flex-shrink-0">
+                        <ParamPanel params={params} onParamChange={handleParamChange} onRebuild={handleRebuild} />
+                    </div>
+                )}
 
-                {/* 3D 뷰포트 */}
+                {/* 3D 뷰포트 — 항상 렌더링 (vpRef 필수) */}
                 <div className="flex-1 relative" style={{minWidth:0}}>
                     <div ref={vpRef} style={{width:'100%',height:'100%'}}></div>
                     {/* 개폐율 표시 */}
@@ -1015,7 +1019,7 @@ className="p-3 overflow-y-auto custom-scrollbar flex-shrink-0">
                 </div>
 
                 {/* 우측 정보 패널 */}
-                <InfoPanel selected={selected} params={params} />
+                {params && <InfoPanel selected={selected} params={params} />}
             </div>
 
             {/* 하단 툴바 */}