diff --git a/CHANGELOG b/CHANGELOG
index 01b5859..4cfedcb 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,6 @@
 # CHANGELOG
 
+- [2026-09-21 11:40] FEAT: v1.9 3D 建模深度完善(技术路线对齐源站型材截面挤出)——①U 型槽型材截面 ExtrudeGeometry 沿框架挤出, 替代平板盒体(外框/中梃/扇框三套型材); ②墙体洞口+地面场景(可开关); ③PCFSoft 阴影(平行光投影+地面接收); ④光照氛围日景/黄昏/夜景; ⑤视角预设正面/45°/侧面/室内+自动旋转; ⑥3D 截图导出 PNG(preserveDrawingBuffer); 开合动画保留 (Files: frontend/src/components/WindoorThreed.vue)
 - [2026-09-21 11:20] FIX+FEAT: v1.8 修复工作台"接口不存在"+3D 区域分配制重建。①补齐公告后端: Announcement 模型+/api/announcements 接口+种子 4 条自撰公告(修复工作台/布局页调用不存在的接口报"接口不存在"); 修复 seed init_db 前置模型导入(announcements 表未建); ②WindoorThreed 重建改为区域分配制: 每个重放区域唯一归属(扇认领重叠最大区域/其余静态玻璃), 杜绝扇面板与玻璃重叠混乱; 全区域绘制薄框线还原真实窗格; 扇面板含玻璃+四边扇框 (Files: src/huamenchuang/models/announcement.py, src/huamenchuang/api/platform.py, src/huamenchuang/scripts/seed.py, frontend/src/components/WindoorThreed.vue)
 - [2026-09-21 11:00] FIX: v1.7 修复 3D NaN 崩溃/样品图不刷新/画布点选失效——①THREE NaN: drawing_data 畸形数据进入 3D 网格, replayShape 段过滤补 Y 轴有限值校验、inferSashGlyphs bdRect 有限值校验、WindoorThreed 逐网格有限值防护+maxDim 守卫、CombineCanvas shapePts 过滤; ②样品图不刷新: 组合画布原地变异 shapes 数组, combinedJson computed 感知不到深层变化 → 引入 rev 版本号强制重算驱动 3D 重建; ③点选失效: 单元包围盒被非有限值污染致命中测试失效, 随①修复 (Files: frontend/src/types/drawing.ts, frontend/src/components/WindoorThreed.vue, frontend/src/components/CombineCanvas.vue, frontend/src/views/CombineView.vue)
 - [2026-09-21 10:50] FIX: 修复 spa_fallback 的 NameError(JSONResponse 未导入导致未匹配 /api 路径 500)与 JWT 密钥长度警告(默认密钥补足 32 字节以上) (Files: src/huamenchuang/main.py, src/huamenchuang/core/config.py)
diff --git a/frontend/src/components/WindoorThreed.vue b/frontend/src/components/WindoorThreed.vue
index 9799f67..e2484e2 100644
--- a/frontend/src/components/WindoorThreed.vue
+++ b/frontend/src/components/WindoorThreed.vue
@@ -5,9 +5,36 @@
       <span v-if="info">{{ info }}</span>
       <span class="hint">左键旋转 · 滚轮缩放 · 右键平移</span>
     </div>
+    <!-- 场景/视角面板 -->
+    <div class="panel">
+      <div class="p-row">
+        <span class="p-label">光照</span>
+        <el-radio-group v-model="lightMode" size="small" @change="applyLight">
+          <el-radio-button value="day">日景</el-radio-button>
+          <el-radio-button value="dusk">黄昏</el-radio-button>
+          <el-radio-button value="night">夜景</el-radio-button>
+        </el-radio-group>
+      </div>
+      <div class="p-row">
+        <span class="p-label">视角</span>
+        <el-radio-group v-model="viewMode" size="small" @change="applyView">
+          <el-radio-button value="front">正面</el-radio-button>
+          <el-radio-button value="deg45">45°</el-radio-button>
+          <el-radio-button value="side">侧面</el-radio-button>
+          <el-radio-button value="indoor">室内</el-radio-button>
+        </el-radio-group>
+      </div>
+      <div class="p-row">
+        <span class="p-label">场景</span>
+        <el-checkbox v-model="showWall" size="small" @change="rebuild">墙体</el-checkbox>
+        <el-checkbox v-model="autoRotate" size="small">自动旋转</el-checkbox>
+        <el-button size="small" text type="primary" @click="screenshot">截图</el-button>
+      </div>
+    </div>
+    <!-- 开合控制 -->
     <div class="ctrl" v-if="hasOpenable">
       <span>开合</span>
-      <el-slider v-model="openPct" style="width: 160px" :min="0" :max="100" :format-tooltip="v => v + '%'" />
+      <el-slider v-model="openPct" style="width: 150px" :min="0" :max="100" :format-tooltip="v => v + '%'" />
       <el-checkbox v-model="autoPlay" size="small">自动演示</el-checkbox>
       <el-button size="small" text @click="openPct = openPct > 0 ? 0 : 100">{{ openPct > 0 ? '全关' : '全开' }}</el-button>
     </div>
@@ -16,13 +43,14 @@
 
 <script setup lang="ts">
 /**
- * 3D 窗型查看器 + 门窗开合动画（自研 Three.js 实现）
- * 构建原则（区域分配制）: 分割树重放后的每个区域唯一归属——
- *   被扇引用的区域 → 生成可开合扇面板（平开绕铰链旋转/推拉沿轨道平移）
- *   其余区域 → 静态玻璃
- *   全部区域绘制薄框线还原真实窗格；组合画布的多形状直接支持。
+ * 3D 窗型查看器 v2（自研 Three.js 实现，技术路线对齐源站：型材截面沿框架路径挤出 + 扇开合）
+ * - 型材: U 型槽截面 ExtrudeGeometry 挤出（外框/中梃/扇框），替代平板盒体
+ * - 场景: 墙体洞口 + 地面 + 阴影 + 光照氛围（日景/黄昏/夜景）
+ * - 开合: 平开扇绕铰链旋转 / 推拉扇轨道平移（开合度滑杆 + 自动演示）
+ * - 视角预设 / 自动旋转 / 截图导出
  */
 import { onMounted, onBeforeUnmount, ref, watch } from 'vue'
+import { ElMessage } from 'element-plus'
 import * as THREE from 'three'
 import {
   bboxOf, inferSashGlyphs, parseDrawing, regionPoints, replayShape,
@@ -38,12 +66,17 @@ const info = ref('')
 const openPct = ref(0)
 const autoPlay = ref(false)
 const hasOpenable = ref(false)
+const lightMode = ref<'day' | 'dusk' | 'night'>('day')
+const viewMode = ref<'front' | 'deg45' | 'side' | 'indoor'>('deg45')
+const showWall = ref(true)
+const autoRotate = ref(false)
 
 let renderer: THREE.WebGLRenderer | null = null
 let scene: THREE.Scene | null = null
 let camera: THREE.PerspectiveCamera | null = null
+let dirLight: THREE.DirectionalLight | null = null
 let raf = 0
-let orbit = { theta: -0.7, phi: 1.1, dist: 1.6, target: new THREE.Vector3(0, 0, 0) }
+let orbit = { theta: -0.7, phi: 1.1, dist: 1.7, target: new THREE.Vector3(0, 0, 0) }
 let dragging: { x: number; y: number; button: number } | null = null
 let sashAnims: {
   group: THREE.Group
@@ -55,6 +88,7 @@ let sashAnims: {
   w: number
 }[] = []
 let curT = 0
+let sceneRoot: THREE.Group | null = null
 
 function dispose() {
   if (scene) {
@@ -75,16 +109,95 @@ function overlapArea(a: BBox, b: BBox): number {
   return w > 0 && h > 0 ? w * h : 0
 }
 
+/** U 型槽型材截面: 沿长度方向挤出, 槽口朝玻璃面(u=0 侧) */
+function profileGeo(len: number, fw: number, depth: number): THREE.BufferGeometry {
+  const t = Math.max(0.004, depth * 0.28)   // 壁厚
+  const s = new THREE.Shape()
+  // 外轮廓 (u: 深度方向 0=玻璃侧, v: 宽度方向)
+  s.moveTo(0, 0)
+  s.lineTo(depth, 0)
+  s.lineTo(depth, fw)
+  s.lineTo(t, fw)
+  s.lineTo(t, t)
+  s.lineTo(depth - t * 1.6, t)
+  s.lineTo(depth - t * 1.6, fw - t)
+  s.lineTo(0, fw - t)
+  s.closePath()
+  const geo = new THREE.ExtrudeGeometry(s, { depth: len, bevelEnabled: false })
+  geo.translate(0, 0, -len / 2)
+  return geo
+}
+
+/** 沿 X 轴的型材杆(槽口朝 -Z 玻璃面) */
+function barX(parent: THREE.Group, mat: THREE.Material, len: number, fw: number,
+              depth: number, cx: number, cy: number, cz: number) {
+  const geo = profileGeo(len, fw, depth)
+  const m = new THREE.Mesh(geo, mat)
+  m.rotation.y = -Math.PI / 2
+  m.position.set(cx, cy, cz)
+  m.castShadow = true
+  parent.add(m)
+}
+
+/** 沿 Y 轴的型材杆 */
+function barY(parent: THREE.Group, mat: THREE.Material, len: number, fw: number,
+              depth: number, cx: number, cy: number, cz: number) {
+  const geo = profileGeo(len, fw, depth)
+  const m = new THREE.Mesh(geo, mat)
+  m.rotation.x = -Math.PI / 2
+  m.rotation.z = Math.PI / 2
+  m.position.set(cx, cy, cz)
+  m.castShadow = true
+  parent.add(m)
+}
+
+const LIGHT_PRESETS = {
+  day:   { dir: 0xfff4e0, intensity: 1.05, ambient: 0.72, bg: 0xf2f4f7, pos: [1, 2, 3] },
+  dusk:  { dir: 0xffb066, intensity: 0.85, ambient: 0.5, bg: 0xe8d5c0, pos: [2.2, 1.1, 1.5] },
+  night: { dir: 0x9fb6ff, intensity: 0.4, ambient: 0.34, bg: 0x252d3a, pos: [-1.5, 2, 2] },
+} as const
+
+function applyLight() {
+  const p = LIGHT_PRESETS[lightMode.value]
+  if (dirLight) {
+    dirLight.color.setHex(p.dir)
+    dirLight.intensity = p.intensity
+    dirLight.position.set(p.pos[0], p.pos[1], p.pos[2])
+  }
+  if (scene) {
+    scene.background = new THREE.Color(p.bg)
+    scene.traverse(o => {
+      if ((o as THREE.AmbientLight).isAmbientLight) (o as THREE.AmbientLight).intensity = p.ambient
+    })
+  }
+}
+
+function applyView() {
+  const presets = {
+    front: { theta: 0, phi: 1.35 },
+    deg45: { theta: -0.7, phi: 1.1 },
+    side: { theta: 1.25, phi: 1.2 },
+    indoor: { theta: Math.PI - 0.2, phi: 1.25 },
+  } as const
+  const p = presets[viewMode.value]
+  orbit.theta = p.theta
+  orbit.phi = p.phi
+}
+
 function build(drawing: DrawingData) {
   dispose()
   scene = new THREE.Scene()
-  scene.background = new THREE.Color(0xf2f4f7)
-  scene.add(new THREE.AmbientLight(0xffffff, 0.75))
-  const dir = new THREE.DirectionalLight(0xffffff, 0.9)
-  dir.position.set(1, 2, 3)
-  scene.add(dir)
+  sceneRoot = new THREE.Group()
+  scene.add(sceneRoot)
   sashAnims = []
 
+  scene.add(new THREE.AmbientLight(0xffffff, 0.72))
+  dirLight = new THREE.DirectionalLight(0xfff4e0, 1.05)
+  dirLight.position.set(1, 2, 3)
+  dirLight.castShadow = true
+  dirLight.shadow.mapSize.set(1024, 1024)
+  scene.add(dirLight)
+
   const pts: Pt[] = []
   for (const s of drawing.sm) {
     for (const r of replayShape(s).regions) {
@@ -101,32 +214,23 @@ function build(drawing: DrawingData) {
   if (!Number.isFinite(maxDim) || maxDim <= 0) { info.value = '无有效几何'; hasOpenable.value = false; return }
   const S = 1 / maxDim
   const cx = (gb.x0 + gb.x1) / 2, cy = (gb.y0 + gb.y1) / 2
-  const DEPTH = Math.max(0.04, (drawing.s?.cs ?? 60) * S * 1.2)
+  const DEPTH = Math.max(0.05, (drawing.s?.cs ?? 60) * S * 1.4)
 
-  const frameMat = new THREE.MeshStandardMaterial({ color: 0x636568, roughness: 0.55, metalness: 0.35 })
-  const mullionMat = new THREE.MeshStandardMaterial({ color: 0x777c82, roughness: 0.5, metalness: 0.35 })
-  const sashMat = new THREE.MeshStandardMaterial({ color: 0x83888f, roughness: 0.5, metalness: 0.35 })
+  const frameMat = new THREE.MeshStandardMaterial({ color: 0x6b7076, roughness: 0.45, metalness: 0.55 })
+  const mullionMat = new THREE.MeshStandardMaterial({ color: 0x777c82, roughness: 0.45, metalness: 0.5 })
+  const sashMat = new THREE.MeshStandardMaterial({ color: 0x84898f, roughness: 0.4, metalness: 0.55 })
+  const wallMat = new THREE.MeshStandardMaterial({ color: 0xe8e2d6, roughness: 0.95 })
+  const groundMat = new THREE.MeshStandardMaterial({ color: 0xcfc9bd, roughness: 1 })
   const glassMat = new THREE.MeshPhysicalMaterial({
-    color: 0xdfeef5, transparent: true, opacity: 0.42, roughness: 0.08,
-    metalness: 0.05, side: THREE.DoubleSide,
+    color: 0xd8ecf5, transparent: true, opacity: 0.4, roughness: 0.06,
+    metalness: 0.1, side: THREE.DoubleSide, envMapIntensity: 1.2,
   })
 
   const frameGroup = new THREE.Group()
   const sashRoot = new THREE.Group()
-  scene.add(frameGroup)
-  scene.add(sashRoot)
-
-  const fwOf = (shape: any) => {
-    const ew = shape.fm?.ew ?? [60, 60, 60, 60]
-    return Math.max(0.02, (ew.reduce((a: number, b: number) => a + b, 0) / ew.length) * S)
-  }
-  const bar = (parent: THREE.Group, mat: THREE.Material, bw: number, bh: number,
-               ox: number, oy: number, oz: number, depth: number) => {
-    const m = new THREE.Mesh(new THREE.BoxGeometry(bw, bh, depth), mat)
-    m.position.set(ox, oy, oz)
-    parent.add(m)
-    return m
-  }
+  sceneRoot.add(frameGroup)
+  sceneRoot.add(sashRoot)
+  const world = (x: number, y: number) => ({ x: (x - cx) * S, y: (y - cy) * S })
 
   for (const shape of drawing.sm) {
     const { regions, sashes } = inferSashGlyphs(shape)
@@ -138,15 +242,12 @@ function build(drawing: DrawingData) {
             const parts = v.split(',').map(x => parseFloat(x))
             return `rgb(${parts[0]},${parts[1]},${parts[2]})`
           })),
-          transparent: true, opacity: 0.45, roughness: 0.1, side: THREE.DoubleSide,
+          transparent: true, opacity: 0.4, roughness: 0.06, metalness: 0.1, side: THREE.DoubleSide,
         })
       : glassMat
-    const fw = fwOf(shape)
+    const fw = Math.max(0.018, fwOf(shape))
 
     const regionBBs: BBox[] = regions.map(r => bboxOf(regionPoints(r)))
-    const regionMids = regionBBs.map(b => ({ x: (b.x0 + b.x1) / 2, y: (b.y0 + b.y1) / 2 }))
-
-    // ---- 区域分配: 每个扇认领重叠最大的未占用区域 ----
     const used = new Set<number>()
     const panels: { rect: BBox; sash: (typeof sashes)[number] }[] = []
     for (const s of sashes) {
@@ -160,24 +261,24 @@ function build(drawing: DrawingData) {
       if (best >= 0 && bestA > 0) { used.add(best); panels.push({ rect: regionBBs[best], sash: s }) }
     }
 
-    // ---- 静态玻璃（未被扇认领的区域）----
+    // 静态玻璃 + 中梃(区域薄型材)
     regionBBs.forEach((bb, ri) => {
       if (used.has(ri)) return
       const w = (bb.x1 - bb.x0) * S, h = (bb.y1 - bb.y0) * S
-      const mx = (regionMids[ri].x - cx) * S, my = (regionMids[ri].y - cy) * S
+      const mx = ((bb.x0 + bb.x1) / 2 - cx) * S
+      const my = ((bb.y0 + bb.y1) / 2 - cy) * S
       if (![w, h, mx, my].every(Number.isFinite) || w <= 0 || h <= 0) return
       const glass = new THREE.Mesh(new THREE.BoxGeometry(w, h, 0.008), gm)
       glass.position.set(mx, my, 0)
       frameGroup.add(glass)
-      // 区域薄框线（窗格还原）
-      const t = Math.max(0.008, fw * 0.35)
-      bar(frameGroup, mullionMat, w, t, mx, my + h / 2 - t / 2, 0, DEPTH * 0.5)
-      bar(frameGroup, mullionMat, w, t, mx, my - h / 2 + t / 2, 0, DEPTH * 0.5)
-      bar(frameGroup, mullionMat, t, h, mx - w / 2 + t / 2, my, 0, DEPTH * 0.5)
-      bar(frameGroup, mullionMat, t, h, mx + w / 2 - t / 2, my, 0, DEPTH * 0.5)
+      const t = Math.max(0.01, fw * 0.4)
+      barX(frameGroup, mullionMat, w, t, DEPTH * 0.55, mx, my + h / 2 - t / 2, 0)
+      barX(frameGroup, mullionMat, w, t, DEPTH * 0.55, mx, my - h / 2 + t / 2, 0)
+      barY(frameGroup, mullionMat, h, t, DEPTH * 0.55, mx - w / 2 + t / 2, my, 0)
+      barY(frameGroup, mullionMat, h, t, DEPTH * 0.55, mx + w / 2 - t / 2, my, 0)
     })
 
-    // ---- 扇面板（可开合）----
+    // 扇面板（可开合）
     panels.forEach(({ rect, s }, k) => {
       const w = (rect.x1 - rect.x0) * S, h = (rect.y1 - rect.y0) * S
       const cxr = ((rect.x0 + rect.x1) / 2 - cx) * S
@@ -186,11 +287,11 @@ function build(drawing: DrawingData) {
       const group = new THREE.Group()
       const glass = new THREE.Mesh(new THREE.BoxGeometry(w, h, 0.006), gm)
       group.add(glass)
-      const t = Math.max(0.016, fw)
-      bar(group, sashMat, w, t, 0, h / 2 - t / 2, 0, DEPTH * 0.7)
-      bar(group, sashMat, w, t, 0, -h / 2 + t / 2, 0, DEPTH * 0.7)
-      bar(group, sashMat, t, h, -w / 2 + t / 2, 0, DEPTH * 0.7)
-      bar(group, sashMat, t, h, w / 2 - t / 2, 0, DEPTH * 0.7)
+      const t = Math.max(0.014, fw)
+      barX(group, sashMat, w, t, DEPTH * 0.7, 0, h / 2 - t / 2, 0)
+      barX(group, sashMat, w, t, DEPTH * 0.7, 0, -h / 2 + t / 2, 0)
+      barY(group, sashMat, h, t, DEPTH * 0.7, -w / 2 + t / 2, 0, 0)
+      barY(group, sashMat, h, t, DEPTH * 0.7, w / 2 - t / 2, 0, 0)
       group.position.set(cxr, cyr, 0)
       sashRoot.add(group)
 
@@ -211,30 +312,63 @@ function build(drawing: DrawingData) {
       }
     })
 
-    // ---- 整体外框 ----
+    // 整体外框（U 型型材）
     const all = regions.map(r => regionPoints(r)).flat()
     if (all.length) {
       const bb = bboxOf(all)
-      const x0 = (bb.x0 - cx) * S, x1 = (bb.x1 - cx) * S
-      const y0 = (bb.y0 - cy) * S, y1 = (bb.y1 - cy) * S
-      const w = x1 - x0, h = y1 - y0
-      bar(frameGroup, frameMat, w + fw * 2, fw, 0, y1 + fw / 2, 0, DEPTH)
-      bar(frameGroup, frameMat, w + fw * 2, fw, 0, y0 - fw / 2, 0, DEPTH)
-      bar(frameGroup, frameMat, fw, h, x0 - fw / 2, 0, DEPTH)
-      bar(frameGroup, frameMat, fw, h, x1 + fw / 2, 0, DEPTH)
+      const p0 = world(bb.x0, bb.y0), p1 = world(bb.x1, bb.y1)
+      const w = p1.x - p0.x, h = p1.y - p0.y
+      const mx = (p0.x + p1.x) / 2, my = (p0.y + p1.y) / 2
+      barX(frameGroup, frameMat, w + fw * 2, fw, DEPTH, mx, my + h / 2 + fw / 2, 0)
+      barX(frameGroup, frameMat, w + fw * 2, fw, DEPTH, mx, my - h / 2 - fw / 2, 0)
+      barY(frameGroup, frameMat, h, fw, DEPTH, mx - w / 2 - fw / 2, my, 0)
+      barY(frameGroup, frameMat, h, fw, DEPTH, mx + w / 2 + fw / 2, my, 0)
     }
   }
 
+  // ---- 墙体洞口 + 地面 ----
+  if (showWall.value) {
+    const bw = 1 / S * 0.72, bh = 1 / S * 0.72
+    const wx0 = -gw * S / 2 - 0.06, wx1 = gw * S / 2 + 0.06
+    const wy0 = -gh * S / 2 - 0.04, wy1 = gh * S / 2 + 0.06
+    const wt = DEPTH * 3
+    const wallBoxes: [number, number, number, number, number][] = [
+      [wx0 - bw, wy1, bw * 2, bh],                    // 上
+      [wx0 - bw, wy0 - bh, bw * 2, bh],               // 下
+      [wx0 - bw, wy0, bw, wy1 - wy0],                 // 左
+      [wx1, wy0, bw, wy1 - wy0],                      // 右
+    ]
+    for (const [px, py, pw, ph] of wallBoxes) {
+      const m = new THREE.Mesh(new THREE.BoxGeometry(pw, ph, wt), wallMat)
+      m.position.set(px + pw / 2, py + ph / 2, 0)
+      m.receiveShadow = true
+      sceneRoot.add(m)
+    }
+    const ground = new THREE.Mesh(new THREE.BoxGeometry(bw * 4, 0.02, DEPTH * 8), groundMat)
+    ground.position.set(0, wy0 - 0.02, DEPTH * 2)
+    ground.receiveShadow = true
+    sceneRoot.add(ground)
+  }
+  sceneRoot.traverse(o => { if ((o as THREE.Mesh).isMesh) { o.castShadow = true; o.receiveShadow = true } })
+  // 玻璃不投影
+  sceneRoot.traverse(o => {
+    const mat = (o as THREE.Mesh).material as THREE.Material | undefined
+    if (mat && (mat as THREE.MeshPhysicalMaterial).transparent) { o.castShadow = false }
+  })
+
   hasOpenable.value = sashAnims.length > 0
-  const grid = new THREE.GridHelper(2, 10, 0xc8cdd2, 0xdfe3e8)
-  grid.position.y = -gh * S / 2 - DEPTH
+  const grid = new THREE.GridHelper(2.4, 12, 0xc8cdd2, 0xdfe3e8)
+  grid.position.y = -gh * S / 2 - DEPTH * 2.2
   scene.add(grid)
 
-  camera!.position.set(
-    orbit.target.x + orbit.dist * Math.sin(orbit.phi) * Math.sin(orbit.theta),
-    orbit.target.y + orbit.dist * Math.cos(orbit.phi),
-    orbit.target.z + orbit.dist * Math.sin(orbit.phi) * Math.cos(orbit.theta))
-  camera!.lookAt(orbit.target)
+  // 阴影相机范围
+  if (dirLight) {
+    const c = dirLight.shadow.camera as THREE.OrthographicCamera
+    c.left = -1.2; c.right = 1.2; c.top = 1.2; c.bottom = -1.2
+    c.updateProjectionMatrix()
+  }
+  applyLight()
+  applyView()
   info.value = `${Math.round(gw)} × ${Math.round(gh)} mm`
 }
 
@@ -254,6 +388,7 @@ function loop() {
   if (!renderer || !scene || !camera) return
   const target = (autoPlay.value ? 50 + 50 * Math.sin(Date.now() / 1200) : openPct.value) / 100
   applyOpen(curT + (target - curT) * 0.12)
+  if (autoRotate.value) orbit.theta += 0.0035
   camera.position.set(
     orbit.target.x + orbit.dist * Math.sin(orbit.phi) * Math.sin(orbit.theta),
     orbit.target.y + orbit.dist * Math.cos(orbit.phi),
@@ -289,10 +424,22 @@ function onWheel(e: WheelEvent) {
   orbit.dist = Math.min(6, Math.max(0.3, orbit.dist * (e.deltaY > 0 ? 1.1 : 0.9)))
 }
 
+function screenshot() {
+  if (!renderer) return
+  renderer.render(scene!, camera!)
+  const a = document.createElement('a')
+  a.href = renderer.domElement.toDataURL('image/png')
+  a.download = '3D窗型.png'
+  a.click()
+  ElMessage.success('截图已保存')
+}
+
 onMounted(() => {
   const wrap = wrapRef.value!, cv = cvRef.value!
-  renderer = new THREE.WebGLRenderer({ canvas: cv, antialias: true })
+  renderer = new THREE.WebGLRenderer({ canvas: cv, antialias: true, preserveDrawingBuffer: true })
   renderer.setSize(wrap.clientWidth, wrap.clientHeight)
+  renderer.shadowMap.enabled = true
+  renderer.shadowMap.type = THREE.PCFSoftShadowMap
   camera = new THREE.PerspectiveCamera(50, wrap.clientWidth / wrap.clientHeight, 0.01, 100)
   cv.addEventListener('mousedown', onDown)
   window.addEventListener('mousemove', onMove)
@@ -303,6 +450,7 @@ onMounted(() => {
   watch(() => props.drawingData, () => {
     try { if (props.drawingData) build(parseDrawing(props.drawingData)) } catch { info.value = '解析失败' }
   }, { immediate: true })
+  watch([lightMode], () => applyLight())
   loop()
 })
 onBeforeUnmount(() => {
@@ -319,6 +467,11 @@ canvas { width: 100%; height: 100%; display: block; }
 .hud3d { position: absolute; right: 10px; top: 10px; background: rgba(255,255,255,0.9);
   border-radius: 6px; padding: 4px 10px; font-size: 12px; color: #606266; display: flex; gap: 12px; }
 .hint { color: #b0b5bc; }
+.panel { position: absolute; left: 10px; top: 10px; background: rgba(255,255,255,0.94);
+  border-radius: 10px; padding: 10px 12px; display: flex; flex-direction: column; gap: 8px;
+  box-shadow: 0 2px 10px rgba(0,0,0,0.12); }
+.p-row { display: flex; gap: 8px; align-items: center; font-size: 12px; color: #606266; flex-wrap: wrap; }
+.p-label { width: 30px; color: #909399; }
 .ctrl { position: absolute; left: 50%; transform: translateX(-50%); bottom: 12px;
   background: rgba(255,255,255,0.92); border-radius: 10px; padding: 8px 14px;
   display: flex; gap: 12px; align-items: center; font-size: 12px; color: #606266;