统一楼层模型视觉基线

src/components/map/ThreeMap.vue

@@ -158,10 +158,18 @@ const OVERVIEW_INITIAL_CAMERA_PARAMS = {
   zoom: 1
 } as const
 
+// The source floor ID is only the calibration origin. This is the shared
+// visitor-facing baseline for every ordinary floor, never a per-floor override.
+const FLOOR_INITIAL_CAMERA_PARAMS = {
+  position: new THREE.Vector3(315.2911, 385.8819, 234.6114),
+  target: new THREE.Vector3(19.7236, -65.382, 42.1148),
+  zoom: 1
+} as const
+
 const getIndoorInitialCameraDirection = () => (
-  OVERVIEW_INITIAL_CAMERA_PARAMS.position
+  FLOOR_INITIAL_CAMERA_PARAMS.position
     .clone()
-    .sub(OVERVIEW_INITIAL_CAMERA_PARAMS.target)
+    .sub(FLOOR_INITIAL_CAMERA_PARAMS.target)
     .normalize()
 )
 
@@ -298,6 +306,32 @@ const referenceOverviewCameraState: CameraSnapshot = (() => {
   }
 })()
 
+const referenceFloorCameraState: CameraSnapshot = (() => {
+  const referenceCamera = new THREE.PerspectiveCamera(
+    SGS_VISUAL_RENDER_CONFIG.camera.fov,
+    1,
+    SGS_VISUAL_RENDER_CONFIG.camera.near,
+    SGS_VISUAL_RENDER_CONFIG.camera.far
+  )
+  referenceCamera.position.copy(FLOOR_INITIAL_CAMERA_PARAMS.position)
+  referenceCamera.up.set(0, 1, 0)
+  referenceCamera.zoom = FLOOR_INITIAL_CAMERA_PARAMS.zoom
+  referenceCamera.lookAt(FLOOR_INITIAL_CAMERA_PARAMS.target)
+  referenceCamera.updateProjectionMatrix()
+
+  return {
+    position: referenceCamera.position.clone(),
+    target: FLOOR_INITIAL_CAMERA_PARAMS.target.clone(),
+    up: referenceCamera.up.clone(),
+    quaternion: referenceCamera.quaternion.clone(),
+    fov: referenceCamera.fov,
+    zoom: referenceCamera.zoom,
+    near: referenceCamera.near,
+    far: referenceCamera.far,
+    distance: referenceCamera.position.distanceTo(FLOOR_INITIAL_CAMERA_PARAMS.target)
+  }
+})()
+
 type FloorIndexItem = GuideModelFloorAsset
 
 interface FloorOption {
@@ -3498,44 +3532,7 @@ const getBoxSignature = (box: THREE.Box3) => [
 const createFloorViewBaseline = (floorId: string, model: THREE.Object3D, modelUrl: string): FloorViewBaseline | null => {
   if (!camera || !controls) return null
 
-  const overviewCamera = initialGuideState?.camera || referenceOverviewCameraState
   const box = getObjectBox(model)
-  const center = box.getCenter(new THREE.Vector3())
-  const size = box.getSize(new THREE.Vector3())
-  const maxDim = Math.max(size.x, size.y, size.z, 1)
-  const verticalFov = overviewCamera.fov * (Math.PI / 180)
-  const horizontalFov = 2 * Math.atan(Math.tan(verticalFov / 2) * camera.aspect)
-  const visibleFraction = FLOOR_CAMERA_DISTANCE_FACTOR
-  const distance = Math.max(
-    size.y / (2 * Math.tan(verticalFov / 2) * visibleFraction),
-    size.x / (2 * Math.tan(horizontalFov / 2) * visibleFraction),
-    size.z / (2 * Math.tan(verticalFov / 2) * visibleFraction),
-    1
-  )
-  const direction = overviewCamera.position.clone().sub(overviewCamera.target).normalize()
-  const target = center.clone()
-  const position = target.clone().add(direction.multiplyScalar(distance))
-  const offsetRatio = SGS_VISUAL_RENDER_CONFIG.framing.floorScreenOffsetRatio
-  const viewDirection = target.clone().sub(position).normalize()
-  const cameraRight = new THREE.Vector3().crossVectors(viewDirection, overviewCamera.up).normalize()
-  const viewHeight = 2 * distance * Math.tan(verticalFov / 2)
-  const viewWidth = viewHeight * camera.aspect
-  const screenOffset = cameraRight.multiplyScalar(offsetRatio.x * viewWidth)
-    .add(overviewCamera.up.clone().multiplyScalar(offsetRatio.y * viewHeight))
-  position.add(screenOffset)
-  target.add(screenOffset)
-
-  const baselineCamera = new THREE.PerspectiveCamera(
-    overviewCamera.fov,
-    camera.aspect,
-    Math.max(SGS_VISUAL_RENDER_CONFIG.camera.near, maxDim / 1000),
-    Math.max(SGS_VISUAL_RENDER_CONFIG.camera.far, maxDim * 20)
-  )
-  baselineCamera.position.copy(position)
-  baselineCamera.up.copy(overviewCamera.up)
-  baselineCamera.zoom = overviewCamera.zoom
-  baselineCamera.lookAt(target)
-  baselineCamera.updateProjectionMatrix()
 
   return {
     floorId,
@@ -3543,17 +3540,7 @@ const createFloorViewBaseline = (floorId: string, model: THREE.Object3D, modelUr
     packageEpoch: modelPackageEpoch,
     aspectRatio: camera.aspect,
     boundsSignature: getBoxSignature(box),
-    camera: {
-      position: baselineCamera.position.clone(),
-      target,
-      up: baselineCamera.up.clone(),
-      quaternion: baselineCamera.quaternion.clone(),
-      fov: baselineCamera.fov,
-      zoom: baselineCamera.zoom,
-      near: baselineCamera.near,
-      far: baselineCamera.far,
-      distance
-    }
+    camera: cloneCameraSnapshot(referenceFloorCameraState)
   }
 }
 
@@ -4243,7 +4230,7 @@ const commitPreparedFloorScene = (
   const floorBaseline = options.applyFloorBaseline
     ? getFloorViewBaseline(expectedFloorId, activeModel, prepared.floor.modelUrl)
     : null
-  const cameraSnapshot = floorBaseline?.camera || options.cameraSnapshot || referenceOverviewCameraState
+  const cameraSnapshot = floorBaseline?.camera || options.cameraSnapshot || referenceFloorCameraState
   restoreCameraSnapshot(cameraSnapshot)
   if (!referenceBuildingAnchors.length) {
     updateReferenceBuildingAnchors(activeModel)
@@ -4292,7 +4279,9 @@ const loadFloor = async (floorId: string, options: LoadFloorOptions = {}) => {
     return false
   }
 
-  const cameraSnapshot = cloneCameraSnapshot(options.cameraSnapshot || captureCameraSnapshot())
+  const cameraSnapshot = options.cameraSnapshot
+    ? cloneCameraSnapshot(options.cameraSnapshot)
+    : undefined
   const loadToken = startFloorContextTransaction(requestedFloorId)
   if (options.detachPoiBeforeLoad) {
     detachActivePoiLayer()
@@ -4303,7 +4292,7 @@ const loadFloor = async (floorId: string, options: LoadFloorOptions = {}) => {
     assertCurrentFloorContextTransaction(loadToken, requestedFloorId, prepared.ownsModel ? prepared.model : undefined)
     commitPreparedFloorScene(prepared, loadToken, requestedFloorId, {
       ...options,
-      cameraSnapshot
+      ...(cameraSnapshot ? { cameraSnapshot } : {})
     })
     return true
   } catch (error) {