diff --git a/src/scene/CesiumGlobe.js b/src/scene/CesiumGlobe.js
index ffd7aaf..f38124a 100644
--- a/src/scene/CesiumGlobe.js
+++ b/src/scene/CesiumGlobe.js
@@ -344,13 +344,12 @@ export class CesiumGlobe {
       const win = Cesium.SceneTransforms.worldToWindowCoordinates(scene, m.position);
       if (!win) { el.style.display = 'none'; continue; }
 
-      // 前/后半球：dot(P, C) > |P|²；地平线附近用 frontness 渐变淡出（避免 acos）
+      // 前/后半球：dot(P, C) > |P|²；背面隐藏（不渐变淡出）
       const frontness = Cesium.Cartesian3.dot(m.position, camPos) - m.r2;
       if (frontness <= 0) { el.style.display = 'none'; continue; }
-      const opacity = Math.min(1, frontness / (m.r2 * 0.02));
 
       el.style.display = 'block';
-      el.style.opacity = String(opacity);
+      el.style.opacity = '1';
       el.style.left = `${win.x - m.tipX}px`;
       el.style.top = `${win.y - m.tipY}px`;
     }