From 53e7b551d07f4349a09f8c60437e6c8f0ff8a9b4 Mon Sep 17 00:00:00 2001
From: fukunee <fukun.ee@foxmail.com>
Date: Sat, 19 Sep 2026 16:26:01 +0800
Subject: [PATCH] =?UTF-8?q?tilt=2050=C2=B0=20=E9=99=90=E5=88=B6=E6=94=B9?=
 =?UTF-8?q?=E7=94=A8=20postUpdate=20pitch=20=E5=A4=B9=E5=8F=96=EF=BC=8C?=
 =?UTF-8?q?=E9=81=BF=E5=85=8D=E6=9E=81=E9=99=90=E6=8A=96=E5=8A=A8?=
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---
 src/scene/CesiumGlobe.js | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/scene/CesiumGlobe.js b/src/scene/CesiumGlobe.js
index 374b96f..728c444 100644
--- a/src/scene/CesiumGlobe.js
+++ b/src/scene/CesiumGlobe.js
@@ -212,7 +212,23 @@ export class CesiumGlobe {
     controller.enableCollisionDetection = true; // 必须开启：缩放距离限制在关闭时会被忽略
     controller.minimumZoomDistance = 3000; // 最近约 3 km（城区尺度）
     controller.maximumZoomDistance = 8e6; // 最远约 8000 km
-    controller.maximumTiltAngle = Cesium.Math.toRadians(50); // 倾斜最多 50°（相对天底）
+
+    // 限制最大倾斜角：pitch 夹取到 -40°（即从天底最多 50°）。用 postUpdate 手动夹取，
+    // 避免原生 maximumTiltAngle 在极限处与拖动反复角力产生的抖动。
+    const MAX_TILT_PITCH = Cesium.Math.toRadians(-40);
+    scene.postUpdate.addEventListener(() => {
+      const camera = viewer.camera;
+      if (camera.pitch > MAX_TILT_PITCH) {
+        camera.setView({
+          destination: Cesium.Cartesian3.clone(camera.positionWC),
+          orientation: {
+            heading: camera.heading,
+            pitch: MAX_TILT_PITCH,
+            roll: camera.roll,
+          },
+        });
+      }
+    });
 
     // 限制鼠标按钮：只保留左键旋转 + 滚轮缩放；禁用中键倾斜、右键缩放
     controller.rotateEventTypes = Cesium.CameraEventType.LEFT_DRAG;