修改：优化手机端的点云效果

src/views/douyin/components/ImagePointCloud.vue

@@ -313,7 +313,8 @@ function init() {
     onSwitchToSubject: () => {
       const src = props.imageUrl
       const entry = renderer.textures.getSubject(src) || renderer.textures.get(src)
-      if (entry && entry.subjectCloudBuffer) {
+      // 缓冲无效则不切，避免切到空点云后整页变黑
+      if (entry && entry.subjectCloudBuffer && entry.subjectCloudBuffer.buffer) {
         renderer.transitionToCloud({
           pointCloudBuffer: entry.subjectCloudBuffer,
           aspect: entry.aspect,

src/views/douyin/components/image-point-cloud/state.js

@@ -78,8 +78,11 @@ function createStateMachine(hooks) {
     subjectReady = false
   }
 
+  let resultReadyAt = 0
+
   function setResultPreloadStatus(s) {
     resultPreloadStatus = s
+    if (s === 'ready' && !resultReadyAt) resultReadyAt = Date.now()
   }
 
   function getUniforms() {
@@ -104,11 +107,15 @@ function createStateMachine(hooks) {
 
   function tryEnterSubject() {
     if (subjectEntered || subjectFailed || !subjectReady) return false
-    if (phase !== PHASE.IMAGE_COLOR_POINT_CLOUD) return false
+    if (phase !== PHASE.IMAGE_COLOR_POINT_CLOUD && phase !== PHASE.RESULT_PRELOADING) {
+      return false
+    }
+    // 等效果图点云采样完成后再进 mask 人物段，避免真机提前切空缓冲黑屏
+    if (resultPreloadStatus !== 'ready') return false
     // 原图彩色点云需先完整展示
-    if (Date.now() - phaseStartedAt < TIMING.IMAGE_COLOR_MS) return false
-    // 结果已好则优先进结果，跳过人物段
-    if (resultPreloadStatus === 'ready') return false
+    if (Date.now() - phaseStartedAt < TIMING.IMAGE_COLOR_MS && phase === PHASE.IMAGE_COLOR_POINT_CLOUD) {
+      return false
+    }
     subjectEntered = true
     if (hooks && hooks.onSwitchToSubject) hooks.onSwitchToSubject()
     beginMorph()
@@ -232,16 +239,22 @@ function createStateMachine(hooks) {
       ) {
         // 彩色原图已展示够再标预加载；人物段优先于 RESULT_PRELOADING 文案
       }
-      if (!tryStartResultTransition() && phase === PHASE.IMAGE_COLOR_POINT_CLOUD) {
-        tryEnterSubject()
-      }
-      // 人物未就绪且结果仍在加载：原图彩色展示满后再进预加载相位
-      if (
-        !subjectEntered &&
-        !subjectReady &&
-        resultPreloadStatus === 'loading' &&
+      // 效果图点云就绪后再进 mask 人物段；识别失败或超时则直接切效果图点云
+      if (resultPreloadStatus === 'ready') {
+        const entered = tryEnterSubject()
+        const subjectWaitedOut =
+          !subjectReady &&
+          !subjectFailed &&
+          resultReadyAt &&
+          Date.now() - resultReadyAt > 12000
+        if (!entered && (subjectFailed || subjectWaitedOut)) {
+          if (subjectWaitedOut) subjectFailed = true
+          tryStartResultTransition()
+        }
+      } else if (
         phase === PHASE.IMAGE_COLOR_POINT_CLOUD &&
-        Date.now() - phaseStartedAt >= TIMING.IMAGE_COLOR_MS
+        Date.now() - phaseStartedAt >= TIMING.IMAGE_COLOR_MS &&
+        (resultPreloadStatus === 'loading' || resultPreloadStatus === 'idle')
       ) {
         enter(PHASE.RESULT_PRELOADING)
       }

src/views/douyin/components/image-point-cloud/webgl/renderer.js

@@ -201,16 +201,20 @@ function createRenderer(canvas, cssW, cssH, dpr, scaleCanvas) {
     cloudA = entry.pointCloudBuffer
     cloudB = entry.pointCloudBuffer
     contentAspect = entry.aspect || cloudA.aspect || 1
+    // count 是整段缓冲长度。点按从上到下写入，只画 liveCount 会把下半身裁掉
     pointCount = cloudA.count || maxPoints
   }
 
   /** Promote current target to A, set B = new target (particle morph) */
   function transitionToCloud(entry) {
-    if (!entry || !entry.pointCloudBuffer) return
+    if (!entry || !entry.pointCloudBuffer || !entry.pointCloudBuffer.buffer) return
     cloudA = cloudB
     cloudB = entry.pointCloudBuffer
     contentAspect = entry.aspect || cloudB.aspect || contentAspect
-    pointCount = Math.max(cloudA.count || 0, cloudB.count || 0, maxPoints)
+    const countA = cloudA.count || 0
+    const countB = cloudB.count || 0
+    // 取两边缓冲容量的较小值，避免越界；不要用有效点数，否则下半身被截掉
+    pointCount = Math.max(1, Math.min(countA || countB, countB || countA))
   }
 
   function setResultTexture(entry) {

src/views/douyin/components/image-point-cloud/webgl/texture-manager.js

@@ -44,7 +44,17 @@ function createTextureManager(gl, canvas, scaleCanvas, viewportW, viewportH) {
     try {
       const dpr = (typeof window !== 'undefined' && window.devicePixelRatio) || 1
       const cores = (typeof navigator !== 'undefined' && navigator.hardwareConcurrency) || 4
-      if (dpr >= 2.5 && cores >= 8) {
+      const ua = (typeof navigator !== 'undefined' && navigator.userAgent) || ''
+      const mobile = /Android|iPhone|iPad|iPod|Mobile/i.test(ua)
+      // 真机内存紧，高点数上传容易丢 WebGL 上下文，之后整页黑屏
+      if (mobile) {
+        maxPoints = POINT_CLOUD.LOW
+        sampleSide = POINT_CLOUD.SAMPLE_LOW
+        maxTexSize = VISUAL.LOW_TEX_SIZE
+        maskSide = POINT_CLOUD.MASK_LOW
+        subjectPoints = POINT_CLOUD.SUBJECT_LOW
+        quality = 'low'
+      } else if (dpr >= 2.5 && cores >= 8) {
         maxPoints = POINT_CLOUD.HIGH
         sampleSide = POINT_CLOUD.SAMPLE_HIGH
         maxTexSize = VISUAL.MAX_TEX_SIZE
@@ -475,7 +485,7 @@ function createTextureManager(gl, canvas, scaleCanvas, viewportW, viewportH) {
           const mask = maskProcessor.decodeMaskImage(
             maskRes.image,
             scaleCtx,
-            scaleCanvas,
+            sampleCanvas,
             aligned.width,
             aligned.height
           )