首次播放不掉帧

examples/3d/index.html

@@ -51,6 +51,13 @@
                    style="width: 100%; cursor: pointer;">
         </div>
 
+        <div class="input-group">
+            <label>播放倍速: <span id="speedValue">1.0x</span></label>
+            <input type="range" id="speedSlider" min="0.25" max="3" step="0.25" value="1.0"
+                   oninput="updatePlaybackSpeed(this.value)"
+                   style="width: 100%; cursor: pointer;">
+        </div>
+
         <button id="generateBtn" onclick="generateAnimation()">生成动画</button>
         <button onclick="playAnimation()">播放动画</button>
         <button onclick="stopAnimation()">停止动画</button>