diff --git a/cimery/crates/viewer/src/bridge_scene.rs b/cimery/crates/viewer/src/bridge_scene.rs
index ba0c8c5..676f7b7 100644
--- a/cimery/crates/viewer/src/bridge_scene.rs
+++ b/cimery/crates/viewer/src/bridge_scene.rs
@@ -80,6 +80,17 @@ pub fn build_bridge_scene<K: GeomKernel>(kernel: &K, p: &SceneParams) -> Result<
 
     let mut parts: Vec<Mesh> = Vec::new();
 
+    // ── Section from SceneParams (girder_height 파라미터 반영) ─────────────────
+    let section = PscISectionParams {
+        total_height:            girder_h as f64,   // ← SceneParams에서 옴
+        top_flange_width:        600.0,
+        top_flange_thickness:    150.0,
+        bottom_flange_width:     700.0,
+        bottom_flange_thickness: 180.0,
+        web_thickness:           200.0,
+        haunch:                  50.0,
+    };
+
     // ── Girders ────────────────────────────────────────────────────────────────
     for i in 0..n_girders {
         let x = (i as f32 - (n_girders as f32 - 1.0) * 0.5) * spacing;
@@ -89,7 +100,7 @@ pub fn build_bridge_scene<K: GeomKernel>(kernel: &K, p: &SceneParams) -> Result<
             station_end:           span_m,
             offset_from_alignment: x as f64,
             section_type:          SectionType::PscI,
-            section: SectionParams::PscI(PscISectionParams::kds_standard()),
+            section: SectionParams::PscI(section.clone()),
             count:    1,
             spacing:  0.0,
             material: MaterialGrade::C50,