diff --git a/src/designer/model2DEditor/ThreeJsEditor.vue b/src/designer/model2DEditor/ThreeJsEditor.vue
index baa095a..b5d7589 100644
--- a/src/designer/model2DEditor/ThreeJsEditor.vue
+++ b/src/designer/model2DEditor/ThreeJsEditor.vue
@@ -312,13 +312,10 @@ function updateGridVisibility() {
  * 计算相机到目标的有效视距
  */
 function getEffectiveViewDistance() {
-  // 1. 获取相机到目标的距离
-  const targetDistance = controls.target.distanceTo(camera.position)
-
-  // 2. 计算当前视口高度（世界单位）
+  if (!camera) {
+    return 10
+  }
   const viewHeight = (camera.top - camera.bottom) / camera.zoom
-
-  // 3. 计算等效的透视相机距离
   // 假设我们希望匹配一个虚拟的透视相机（通常使用45度fov作为参考）
   const referenceFOV = 45 // 参考视场角
   return viewHeight / (2 * Math.tan(THREE.MathUtils.degToRad(referenceFOV) / 2))