地理视图等瓦片加载完再淡入，避免逐块弹出

src/core/App.js

@@ -54,6 +54,9 @@ export class App {
     this.cameraTween = null;
     this._animate = this._animate.bind(this);
     requestAnimationFrame(this._animate);
+
+    // 首屏渲染后，分帧生成时间轴文字标签（避免阻塞首屏加载环）
+    requestAnimationFrame(() => requestAnimationFrame(() => this.timeline.initLabels()));
   }
 
   // 首屏加载完成后由 main.js 调用：后台预载地理视图，就绪后激活“地理”按钮
@@ -208,6 +211,7 @@ export class App {
       if (this.view === 'timeline') {
         // 时间轴：按下开始拖拽左右滑动；未移动的抬起才视为点击选中
         this.timelineSlide = null; // 手动拖拽时取消居中动画
+        this.timeline.setPausedGeneration(true); // 拖拽期间暂停纹理生成，保持流畅
         this._drag = { active: true, startX: e.clientX, startY: e.clientY, moved: false, offset: this.timelineOffset };
         canvas.setPointerCapture(e.pointerId);
       } else {
@@ -240,6 +244,7 @@ export class App {
         const wasClick = !this._drag.moved;
         this._drag.active = false;
         canvas.style.cursor = 'grab';
+        this.timeline.setPausedGeneration(false); // 拖拽结束，恢复纹理生成
         if (wasClick) this._pick();
       }
     });
@@ -247,6 +252,7 @@ export class App {
     canvas.addEventListener('pointercancel', () => {
       if (this._drag) this._drag.active = false;
       canvas.style.cursor = 'grab';
+      this.timeline.setPausedGeneration(false);
     });
 
     window.addEventListener('resize', () => this._onResize());
@@ -328,10 +334,12 @@ export class App {
     const { view, index } = hit.object.userData;
     if (view === 'binder') {
       const cur = this.binder.current;
-      if (index === cur) {
-        this.binder.flipForward();   // 点击当前右页：翻到下一页
+      const f = this.binder.flip;
+      // 翻页进行中：把“正在翻的页”与“即将露出的下一页”都视为向前翻的目标，点击不阻断
+      if (index === cur || (f && index === f.nextCurrent)) {
+        this.binder.flipForward();
       } else if (index === cur - 1) {
-        this.binder.flipBackward();  // 点击左页：翻回上一页
+        this.binder.flipBackward();
       } else {
         this._select(index, { syncBinder: true });
       }
@@ -395,10 +403,15 @@ export class App {
     iris.style.opacity = '1';
     const doSwap = () => {
       this._setView(view);
-      // 等新视图渲染一两帧后再淡出，避免半透明时看到切换瞬间
-      requestAnimationFrame(() => {
-        requestAnimationFrame(() => { iris.style.opacity = '0'; });
-      });
+      if (view === 'globe') {
+        // 地理视图：等影像/地形瓦片加载完成再淡出，让球体与标记/标签一起出现
+        this.globe.waitUntilViewReady(4000).then(() => { iris.style.opacity = '0'; });
+      } else {
+        // 等新视图渲染一两帧后再淡出，避免半透明时看到切换瞬间
+        requestAnimationFrame(() => {
+          requestAnimationFrame(() => { iris.style.opacity = '0'; });
+        });
+      }
     };
     setTimeout(doSwap, 200); // 与 0.18s 的淡入匹配，完全变黑后再切换
   }
@@ -412,6 +425,9 @@ export class App {
     this.binder.group.visible = view === 'binder';
     this.timeline.group.visible = view === 'timeline';
 
+    // 阴影仅在活页本视图启用：时间轴/地理无投影，降低滑动时阴影贴图重绘开销
+    this.renderer.shadowMap.enabled = view === 'binder';
+
     // Cesium 地球：地理视图显示 Cesium 画布，其余视图显示 Three.js 画布
     document.getElementById('scene').style.display = isGlobe ? 'none' : 'block';
     document.getElementById('cesium-container').classList.toggle('visible', isGlobe);