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+import React, { Suspense, useEffect, useMemo, useRef ,useState} from 'react'
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+import { Canvas, useThree } from '@react-three/fiber'
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+import { OrbitControls, Html, useGLTF, Bounds, useFBX, useAnimations } from '@react-three/drei'
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+import * as THREE from 'three'
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+
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+// 轨道控制器，限制缩放比和距离
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+function ControlsWithLimits({ controlsRef, zoomMin, zoomMax, baseDistance }) {
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+ const { camera } = useThree()
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+ // autoRotateSpeed!==0即自动旋转
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+ const [autoRotateSpeed,setAutoRotateSpeed] = useState(0)
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+ useEffect(() => {
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+ const controls = controlsRef.current
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+ if (!controls || baseDistance == null) return
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+ controls.maxDistance = baseDistance * Math.max(1, zoomMin)
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+ }, [camera, controlsRef, baseDistance, zoomMin, zoomMax])
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+ useEffect(()=>{
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+ window.sceneFc = {
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+ resetView: () => {
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+ if (controlsRef.current) {
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+ controlsRef.current.reset()
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+ }
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+ },
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+ setAutoRotate: (speed = 1.0) => {
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+ const clampedSpeed = Math.max(0.1, Math.min(8, Number(speed) || 1))
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+ setAutoRotateSpeed(clampedSpeed)
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+ }
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+ }
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+ },[])
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+ // 添加双击归位
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+ useEffect(() => {
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+ const onDoubleClick = () => {
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+ if (controlsRef.current) {
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+ console.log(123)
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+ controlsRef.current.reset()
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+ }
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+ }
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+ window.addEventListener('dblclick', onDoubleClick)
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+ return () => window.removeEventListener('dblclick', onDoubleClick)
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+ }, [controlsRef])
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+
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+ return (
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+ <OrbitControls
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+ ref={controlsRef}
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+ enableDamping
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+ dampingFactor={0.08}
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+ rotateSpeed={0.8}
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+ zoomSpeed={1.0}
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+ enableZoom
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+ enablePan
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+ panSpeed={0.8}
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+ screenSpacePanning
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+ touches={{
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+ ONE: THREE.TOUCH.ROTATE,
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+ TWO: THREE.TOUCH.DOLLY_PAN
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+ }}
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+ makeDefault
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+ autoRotate={!!autoRotateSpeed}
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+ autoRotateSpeed={autoRotateSpeed}
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+ />
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+ )
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+}
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+
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+// glb/gltf文件加载
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+function Model({ url }) {
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+ const { scene, animations } = useGLTF(url, true)
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+ const ref = useRef()
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+ const { actions, names } = useAnimations(animations, ref)
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+ useEffect(() => {
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+ if (!actions || !names || names.length === 0) return
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+ const a = actions[names[0]]
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+ if (a) {
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+ a.reset()
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+ a.play()
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+ }
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+ }, [actions, names])
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+ return <primitive ref={ref} object={scene} />
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+}
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+
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+// fbx文件加载
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+function FBXModel({ url }) {
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+ const obj = useFBX(url)
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+ const ref = useRef()
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+ const { actions, names } = useAnimations(obj.animations || [], ref)
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+ useEffect(() => {
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+ if (!actions || !names || names.length === 0) return
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+ const a = actions[names[0]]
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+ if (a) {
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+ a.reset()
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+ a.play()
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+ }
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+ }, [actions, names])
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+ return <primitive ref={ref} object={obj} />
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+}
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+
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+// 方便模型类型
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+function pickModel(url) {
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+ const u = (url || '').toLowerCase()
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+ const clean = u.split('?')[0].split('#')[0]
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+ if (clean.endsWith('.fbx')) return 'fbx'
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+ return 'gltf'
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+}
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+
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+// 场景
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+function Scene({ url, zoomMin, zoomMax }) {
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+ const controlsRef = useRef()
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+ const { camera ,gl} = useThree()
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+ const [baseDistance, setBaseDistance] = useState(null)
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+ const [initialState, setInitialState] = useState(null) // 保存 fit 后的初始相机 + target
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+
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+ const kind = pickModel(url)
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+
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+ // 平滑复位函数
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+ const resetToInitial = () => {
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+ if (!controlsRef.current || !initialState) {
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+ console.warn('无法复位：controls 或 initialState 未就绪')
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+ return
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+ }
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+
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+ const controls = controlsRef.current
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+
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+ const startPos = camera.position.clone()
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+ const startTarget = controls.target.clone()
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+ const endPos = initialState.position
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+ const endTarget = initialState.target
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+
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+ let t = 0
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+ const duration = 800 // ms，可调
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+ const startTime = performance.now()
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+
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+ const animate = (time) => {
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+ const elapsed = time - startTime
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+ t = Math.min(elapsed / duration, 1)
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+
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+ camera.position.lerpVectors(startPos, endPos, t)
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+ controls.target.lerpVectors(startTarget, endTarget, t)
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+ controls.update()
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+
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+ if (t < 1) {
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+ requestAnimationFrame(animate)
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+ }
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+ }
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+
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+ requestAnimationFrame(animate)
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+ }
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+
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+ // 监听模型适应大小后，回调确认位置
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+function FitWatcher({ controlsRef, onBase }) {
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+ const { camera } = useThree()
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+
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+ useEffect(() => {
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+ if (!controlsRef.current) return
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+
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+ let rafId
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+ let attempts = 0
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+ const maxAttempts = 30 // 防死循环，大约 0.5 秒
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+
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+ const tryCapture = () => {
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+ const controls = controlsRef.current
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+ const d = camera.position.distanceTo(controls.target)
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+
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+ // 如果连续几帧距离几乎不变，就认为 fit 完成了
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+ if (Math.abs(d - (window.lastD || d)) < 0.001 && attempts > 5) {
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+ onBase(d)
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+ setTimeout(() => {
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+ if (!initialState && controlsRef.current) {
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+ console.log(controlsRef.current.target.clone())
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+ setInitialState({
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+ position: camera.position.clone(),
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+ target: controlsRef.current.target.clone(),
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+ })
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+ console.log('稳定后保存初始状态：', camera.position)
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+ }
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+ }, 300)
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+ return
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+ }
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+
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+ window.lastD = d
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+ attempts++
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+ if (attempts < maxAttempts) {
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+ rafId = requestAnimationFrame(tryCapture)
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+ }
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+ }
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+
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+ rafId = requestAnimationFrame(tryCapture)
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+
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+ return () => {
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+ cancelAnimationFrame(rafId)
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+ delete window.lastD
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+ }
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+ }, [onBase, camera, controlsRef])
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+
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+ return null
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+}
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+
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+ // 在 fit 完成后保存初始状态
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+ useEffect(() => {
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+ setTimeout(() => {
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+ setInitialState({
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+ position: camera.position.clone(),
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+ target: controlsRef.current.target.clone(),
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+ })
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+ }, 200);
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+ if (baseDistance && !initialState && controlsRef.current) {
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+ console.log(camera.position.clone(),controlsRef.current.target.clone())
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+ setInitialState({
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+ position: camera.position.clone(),
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+ target: controlsRef.current.target.clone(),
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+ })
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+ }
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+ }, [baseDistance, camera, initialState])
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+
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+ // 暴露到 window（只暴露一次，组件卸载时清理）
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+ useEffect(() => {
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+ // 创建或覆盖 window.sceneFc
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+ window.sceneFc = window.sceneFc || {}
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+ window.sceneFc.reset = resetToInitial
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+
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+ console.log('window.sceneFc.reset 已暴露，可外部调用')
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+
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+ return () => {
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+ // 清理（可选，但推荐）
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+ if (window.sceneFc && window.sceneFc.reset === resetToInitial) {
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+ delete window.sceneFc.reset
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+ }
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+ }
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+ }, [resetToInitial]) // 依赖 resetToInitial，确保函数稳定
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+
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+ // 双击复位监听（使用 click 事件判断双击，更可靠）
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+ useEffect(() => {
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+ let lastClickTime = 0
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+ let clickCount = 0
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+ let timeoutId
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+
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+ const handleClick = (e) => {
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+ const now = Date.now()
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+
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+ // 如果点击在 OrbitControls 控制区域内（避免误触 UI）
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+ if (e.target !== gl.domElement) return
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+
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+ clickCount++
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+
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+ if (clickCount === 1) {
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+ timeoutId = setTimeout(() => {
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+ clickCount = 0
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+ }, 300)
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+ }
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+
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+ if (clickCount === 2) {
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+ clearTimeout(timeoutId)
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+ clickCount = 0
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+
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+ // 阻止默认行为（如果有）
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+ e.preventDefault()
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+ e.stopPropagation()
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+
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+ resetToInitial()
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+ }
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+
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+ lastClickTime = now
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+ }
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+
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+ const dom = gl.domElement
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+ dom.addEventListener('click', handleClick)
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+
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+ return () => {
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+ dom.removeEventListener('click', handleClick)
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+ }
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+ }, [gl, resetToInitial])
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+
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+ return (
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+ <>
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+ <ambientLight intensity={0.8} />
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+ <directionalLight position={[5, 5, 5]} intensity={1.0} />
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+ {url ? (
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+ <Suspense
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+ fallback={
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+ <Html center style={{ color: '#222', fontSize: 14 }}>
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+ 模型加载中…
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+ </Html>
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+ }
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+ >
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+ <Bounds fit clip observe margin={1.2}>
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+ {kind === 'fbx' ? <FBXModel url={url} /> : kind === 'usdz' ? <USDZModel url={url} /> : <Model url={url} />}
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+ <ControlsWithLimits controlsRef={controlsRef} zoomMin={zoomMin} zoomMax={zoomMax} baseDistance={baseDistance} />
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+ <FitWatcher controlsRef={controlsRef} onBase={setBaseDistance} />
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+ </Bounds>
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+ </Suspense>
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+ ) : (
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+ <>
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+ <ControlsWithLimits controlsRef={controlsRef} zoomMin={zoomMin} zoomMax={zoomMax} baseDistance={baseDistance} />
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+ <FitWatcher controlsRef={controlsRef} onBase={setBaseDistance} />
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+ <Html center style={{ color: '#222', fontSize: 14 }}>
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+ 请在地址栏提供 ?src=GLB地址
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+ </Html>
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+ </>
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+ )}
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+ </>
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+ )
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+}
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+
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+export default Scene
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lanxin
недель назад: 2