fix: 分屏-bim 报错

src/utils/ConvertViews.js

@@ -609,6 +609,7 @@ export default class ConvertViews extends THREE.EventDispatcher{
             matrix.premultiply(moveBackMatrix)//再移动到realPosition的点0处
             return matrix
         }
+        let length = Math.min(panoPos1.length,  panoPos2.length)
         if(length == 0){
             convertInfo.convertMatrix = new THREE.Matrix4
             convertInfo.convertMatrixInvert = new THREE.Matrix4
@@ -619,7 +620,7 @@ export default class ConvertViews extends THREE.EventDispatcher{
             
         //检查是否重合。直接将matrix作用于pos1中，理想情况是会和pos2完全一样。
 
-        let length = Math.min(panoPos1.length,  panoPos2.length)
+        
         if(length>2){
             let diffVecs = panoPos1.slice(0,length).map((e,i)=>{
                 let newPos = e.clone().applyMatrix4(matrix) //旋转过后。