From 81c62104deb4bd8523728b025b51e358182c4979 Mon Sep 17 00:00:00 2001
From: FenjuFu <92919259+FenjuFu@users.noreply.github.com>
Date: Thu, 10 Sep 2026 13:08:37 +0800
Subject: [PATCH] fix(viewer): clamp GLB floor animation on slow frames

Signed-off-by: FenjuFu <92919259+FenjuFu@users.noreply.github.com>
---
 packages/viewer/src/components/viewer/glb-scene.tsx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/packages/viewer/src/components/viewer/glb-scene.tsx b/packages/viewer/src/components/viewer/glb-scene.tsx
index e2e604dca0..4d19c1c196 100644
--- a/packages/viewer/src/components/viewer/glb-scene.tsx
+++ b/packages/viewer/src/components/viewer/glb-scene.tsx
@@ -599,7 +599,9 @@ export function GlbScene({
       const targetY = baseY + (exploded ? index * EXPLODED_GAP : 0)
       // Snap (not lerp) in walkthrough so the first-person collider, built from
       // these world positions, matches the stacked building immediately.
-      node.position.y = walkthroughMode ? targetY : lerp(node.position.y, targetY, delta * 12)
+      node.position.y = walkthroughMode
+        ? targetY
+        : lerp(node.position.y, targetY, Math.min(1, delta * 12))
       // Solo: hidden levels above the soloed one keep casting shadows
       // (shadow-caster-only); below-levels can't block the sun, so plain-hide.
       const hidden =