修正楼层显示顺序

src/components/map/ThreeMap.vue

@@ -62,6 +62,9 @@ import type {
   GuideRouteFloorSegment,
   GuideRouteResult
 } from '@/domain/museum'
+import {
+  compareFloorsTopToBottom
+} from '@/domain/guideFloor'
 
 type ViewMode = 'overview' | 'floor' | 'multi'
 type CameraPreset = 'top' | 'oblique'
@@ -202,7 +205,7 @@ const renderPackage = ref<GuideModelRenderPackage | null>(null)
 
 const floors = computed<FloorOption[]>(() => (
   [...floorIndex.value]
-    .sort((a, b) => b.order - a.order)
+    .sort(compareFloorsTopToBottom)
     .map((floor) => ({
       id: floor.floorId,
       label: formatFloorLabel(floor.floorId)
@@ -1424,7 +1427,7 @@ const applyMultiFloorLayout = (items: MultiFloorModelItem[]) => {
   const centerIndex = (items.length - 1) / 2
 
   items.forEach((item, index) => {
-    const offsetY = (index - centerIndex) * verticalGap
+    const offsetY = (centerIndex - index) * verticalGap
     item.model.position.y += offsetY
     item.model.userData.multiFloorOffsetY = offsetY
     item.model.userData.multiFloorVerticalGap = verticalGap
@@ -1892,7 +1895,7 @@ const loadMultiFloor = async () => {
 
   const group = new THREE.Group()
   group.name = 'GuideMultiFloorModel'
-  const orderedFloors = [...floorIndex.value].sort((a, b) => a.order - b.order)
+  const orderedFloors = [...floorIndex.value].sort(compareFloorsTopToBottom)
   const loadedFloors: MultiFloorModelItem[] = []
   const sharedModelUrl = getSharedMultiFloorModelUrl(orderedFloors)
 
@@ -2695,7 +2698,7 @@ const loadModelPackage = async () => {
   renderPackage.value = packageData
 
   setProgress(14, '正在读取楼层索引...')
-  floorIndex.value = [...packageData.floors].sort((a, b) => a.order - b.order)
+  floorIndex.value = [...packageData.floors].sort(compareFloorsTopToBottom)
 
   if (!floorIndex.value.some((floor) => floor.floorId === currentFloor.value)) {
     currentFloor.value = floorIndex.value.find((floor) => floor.floorId === 'L1')?.floorId || floorIndex.value[0]?.floorId || 'L1'