diff --git a/cimery/crates/kernel/src/bearing.rs b/cimery/crates/kernel/src/bearing.rs
index ea436dc..9bf0e80 100644
--- a/cimery/crates/kernel/src/bearing.rs
+++ b/cimery/crates/kernel/src/bearing.rs
@@ -7,18 +7,20 @@ pub fn build_bearing_mesh(ir: &BearingIR) -> Result<Mesh, KernelError> {
     if ir.plan_length <= 0.0 || ir.plan_width <= 0.0 || ir.total_height <= 0.0 {
         return Err(KernelError::InvalidInput("bearing dimensions must be positive".into()));
     }
-    // Box: X=[-l/2, +l/2] centred, Y=[-h, 0] (top at Y=0 = girder soffit), Z=[0, w]
-    // Caller translates to girder X offset; Y=0 means bearing top sits at soffit.
-    let l = ir.plan_length as f32;
+    // 좌표계: X = 횡방향(transverse), Y = 높이(vertical, top = 0), Z = 경간방향(span).
+    // plan_length = 경간 방향 치수 [mm] → sweep 축(Z).
+    // plan_width  = 횡방향 치수  [mm] → profile X 축.
+    // Y=0 = 거더 소핏(soffit); bearing 상부가 소핏에 밀착.
+    let trans_dim = ir.plan_width  as f32;   // 횡 방향 (profile X)
+    let span_dim  = ir.plan_length as f32;   // 경간 방향 (sweep Z)
     let h = ir.total_height as f32;
-    let w = ir.plan_width as f32;
     let profile = vec![
-        [-l * 0.5, -h ],
-        [ l * 0.5, -h ],
-        [ l * 0.5,  0.0],
-        [-l * 0.5,  0.0],
+        [-trans_dim * 0.5, -h ],
+        [ trans_dim * 0.5, -h ],
+        [ trans_dim * 0.5,  0.0],
+        [-trans_dim * 0.5,  0.0],
     ];
-    Ok(sweep::sweep_profile_flat(&profile, w))
+    Ok(sweep::sweep_profile_flat(&profile, span_dim))
 }
 
 #[cfg(test)]
diff --git a/cimery/crates/viewer/src/bridge_scene.rs b/cimery/crates/viewer/src/bridge_scene.rs
index c51dc83..3780500 100644
--- a/cimery/crates/viewer/src/bridge_scene.rs
+++ b/cimery/crates/viewer/src/bridge_scene.rs
@@ -171,6 +171,9 @@ pub fn build_bridge_scene<K: GeomKernel>(kernel: &K, p: &SceneParams) -> Result<
 
     // ── Bearings ───────────────────────────────────────────────────────────────
     // 5 per abutment, one under each girder
+    // plan_length(350mm) = 경간 방향 → half = 175mm 으로 Z 센터링.
+    const BEARING_PLAN_LEN: f32 = 350.0;
+    const BEARING_PLAN_WID: f32 = 450.0;
     for &z in &[0.0_f32, span_mm] {
         for i in 0..n_girders {
             let x = (i as f32 - (n_girders as f32 - 1.0) * 0.5) * spacing;
@@ -178,14 +181,15 @@ pub fn build_bridge_scene<K: GeomKernel>(kernel: &K, p: &SceneParams) -> Result<
                 id:                FeatureId::new(),
                 station:           if z < 1.0 { 0.0 } else { span_m },
                 bearing_type:      BearingType::Elastomeric,
-                plan_length:       350.0,
-                plan_width:        450.0,
+                plan_length:       BEARING_PLAN_LEN as f64,
+                plan_width:        BEARING_PLAN_WID as f64,
                 total_height:      BEARING_H as f64,
                 capacity_vertical: 1_500.0,
             };
             let mut mesh = kernel.bearing_mesh(&bearing_ir)?;
             mesh.recolor(COL_BEARING);
-            parts.push(translate(mesh, x, 0.0, z - 225.0));
+            // Z 중심 = 교대 위치(z). bearing mesh Z = [0, plan_length] → 오프셋 = z - plan_length/2.
+            parts.push(translate(mesh, x, 0.0, z - BEARING_PLAN_LEN * 0.5));
         }
     }
 
@@ -383,18 +387,20 @@ pub fn build_selectable_scene<K: GeomKernel>(
     out.push(FeatureMesh { mesh: deck, label: "바닥판 슬래브".into() });
 
     // Bearings
+    // plan_length(350mm) = 경간 방향 → Z 센터링 오프셋 = z - 175.
+    const SEL_BEARING_LEN: f32 = 350.0;
     for &z in &[0.0_f32, span_mm] {
         for i in 0..n_girders {
             let x = (i as f32 - (n_girders as f32 - 1.0) * 0.5) * spacing;
             let bir = BearingIR {
                 id: FeatureId::new(), station: if z < 1.0 { 0.0 } else { span_m },
                 bearing_type: BearingType::Elastomeric,
-                plan_length: 350.0, plan_width: 450.0,
+                plan_length: SEL_BEARING_LEN as f64, plan_width: 450.0,
                 total_height: BEARING_H as f64, capacity_vertical: 1_500.0,
             };
             let mut mesh = kernel.bearing_mesh(&bir)?;
             mesh.recolor(COL_BEARING);
-            for v in &mut mesh.vertices { v[0] += x; v[2] += z - 225.0; }
+            for v in &mut mesh.vertices { v[0] += x; v[2] += z - SEL_BEARING_LEN * 0.5; }
             let side = if z < 1.0 { "시작" } else { "종점" };
             out.push(FeatureMesh { mesh, label: format!("받침 {}-{}", side, i + 1) });
         }
diff --git a/cimery/crates/viewer/src/lib.rs b/cimery/crates/viewer/src/lib.rs
index bea7e0c..adc8703 100644
--- a/cimery/crates/viewer/src/lib.rs
+++ b/cimery/crates/viewer/src/lib.rs
@@ -492,6 +492,9 @@ impl RenderState {
         let (mn, mx) = scene_extents(&self.params);
         self.scene_mn = mn;
         self.scene_mx = mx;
+        // Apply 후 씬 범위에 맞게 카메라 자동 피트 (거더 높이 변경 등이 즉시 보이도록).
+        self.camera.zoom_extents(mn, mx);
+        self.update_camera();
         self.dirty = false;
     }