From 51c9161b7cc255615b6c88506c3c299049cd5f64 Mon Sep 17 00:00:00 2001
From: "gpt-engineer-app[bot]"
 <159125892+gpt-engineer-app[bot]@users.noreply.github.com>
Date: Thu, 14 May 2026 16:40:33 +0000
Subject: [PATCH 01/18] Changes

Co-authored-by: Reifonas <211114984+Reifonas@users.noreply.github.com>
---
 .lovable/plan.md | 154 +++++++++++++++--------------------------------
 1 file changed, 49 insertions(+), 105 deletions(-)

diff --git a/.lovable/plan.md b/.lovable/plan.md
index c6bdee8..649cb92 100644
--- a/.lovable/plan.md
+++ b/.lovable/plan.md
@@ -1,118 +1,62 @@
-# Plano — Compartilhar tela do Quest 3 via link público
+## Resposta curta
 
-Permitir que o inspetor no Quest gere um link tipo `tracksteelxr.lovable.app/watch/AB12CD`, mande no WhatsApp/email, e até 3 espectadores assistam ao vivo (vídeo + áudio do Quest) em qualquer celular ou PC.
+Sim, é totalmente possível — hoje o app só carrega 1 modelo por vez (`model: ModelInfo | null` no store), mas a arquitetura (Three.js + R3F) suporta naturalmente múltiplas peças em uma mesma cena. Precisa migrar de "modelo único" para "lista de modelos", cada um com seu próprio transform (posição/rotação/escala) e seleção ativa.
 
-## Como vai funcionar para o usuário
+## O que muda
 
-**No Quest (broadcaster):**
-1. No HUD do `/xr` aparece novo botão **"Compartilhar"** (ícone Share/Cast)
-2. Ao clicar: app gera código de 6 caracteres, mostra QR + link encurtado
-3. Botões "Copiar link" e "Compartilhar" (Web Share API → abre WhatsApp/email do sistema)
-4. Indicador vermelho 🔴 LIVE fica visível enquanto transmite, com contador de viewers
-5. Botão "Encerrar" para parar
+### 1. Store (`useModelStore.ts`)
+- Substituir `model: ModelInfo | null` por `models: SceneModel[]` (até 5 simultâneos para manter 72 FPS no Quest 3).
+- Cada `SceneModel` tem: `id`, `fileName`, `url`, `fineTuning` próprio, `visible`, `color` (cor de identificação), `locked`.
+- Adicionar `activeModelId: string | null` — o "modelo selecionado" recebe os controles de fine-tuning, escala e medição.
+- Ações: `addModel`, `removeModel`, `duplicateModel`, `setActiveModel`, `updateModelTransform`, `toggleVisibility`.
+- Compatibilidade: `model` (singular) continua exposto como getter derivado do `activeModelId` para não quebrar telas legadas.
 
-**No celular/PC (viewer):**
-1. Abre o link → tela cheia com vídeo da sessão XR
-2. Sem login, sem instalar nada
-3. Mostra "Aguardando inspetor…" se a sala não estiver ativa
-4. Read-only: só assiste
+### 2. Cena 3D (`ModelViewer.tsx`)
+- Renderizar `models.map(m => <GLBModel key={m.id} model={m} isActive={m.id === activeModelId} />)`.
+- Cada `<GLBModel>` aplica seu próprio transform (já existe a lógica, só vira por-instância).
+- Outline/halo sutil no modelo ativo para feedback visual.
+- Click em um modelo → torna-o ativo (raycaster identifica qual instância foi clicada).
 
-## Arquitetura técnica
+### 3. UI Desktop (`Viewer.tsx`)
+- Novo painel **"Cena"** lateral listando os modelos carregados:
+  - Nome do arquivo, cor, ícones de visibilidade (olho), trava (cadeado), duplicar, remover.
+  - Item destacado = ativo. Click seleciona.
+- Botão **"+ Adicionar modelo"** abre o mesmo fluxo de upload/cloud já existente, mas em modo "append" em vez de "replace".
+- `FineTuningControls`, `ScaleSelector` passam a operar sobre o modelo ativo.
 
-```text
-   Quest 3 (broadcaster)              Lovable Cloud                 Viewers (celular/PC)
-   ┌──────────────────┐         ┌─────────────────────┐         ┌──────────────────┐
-   │ /xr              │         │ Supabase Realtime   │         │ /watch/AB12CD    │
-   │ - canvas WebXR   │ ──SDP──▶│ (signaling channel) │◀──SDP── │ - <video> tag    │
-   │ - getDisplayMedia│         │ rooms table         │         │ - peer connection│
-   │ - RTCPeerConn x3 │◀════════ ICE candidates ═════════════▶  │                  │
-   └──────────────────┘         │ viewers count       │         └──────────────────┘
-            ║                   └─────────────────────┘                    ▲
-            ╚════════ WebRTC P2P media stream (vídeo H264) ════════════════╝
-```
+### 4. UI XR/AR (`XRHud.tsx`)
+- Painel flutuante com a lista de peças (mesmos botões compactos).
+- Botão "Adicionar" abre o `CloudLoader` já existente em modo append.
+- Gestos do controle: o grab (já implementado em `XRGrabbable`) move só o modelo ativo / o que foi pinçado diretamente.
 
-**Stack:**
-- **Lovable Cloud** (precisa habilitar): tabela `share_rooms` + canal Realtime para signaling
-- **WebRTC nativo do browser** (`RTCPeerConnection`) — sem libs pesadas
-- **Captura no Quest:** `navigator.mediaDevices.getDisplayMedia()` no browser do Quest captura a janela atual (inclui o canvas 3D). Em sessão XR imersiva, alternativa é usar `canvas.captureStream(30)` direto do canvas WebGL — funciona melhor e não precisa de prompt
-- **Sem servidor de mídia (SFU):** P2P 1→3 viewers, banda do Quest aguenta tranquilo (~2 Mbps por viewer)
+### 5. Funcionalidades dependentes
+- **Medições**: passam a ter `modelId` opcional (de qual peça partiu o ponto). Continuam globais na cena — útil para medir GAP entre peças.
+- **Checklist**: por enquanto continua global (uma inspeção por sessão). Pode-se evoluir depois para checklist por peça.
+- **Screenshot/PDF**: capturam a cena inteira (todas as peças visíveis), sem mudança.
+- **Compare mode**: opera sobre a cena toda, sem mudança.
 
-## Estrutura de arquivos
+## Limitações conhecidas
 
-**Novos:**
-- `src/pages/Watch.tsx` — página pública do viewer (rota `/watch/:code`)
-- `src/components/ShareButton.tsx` — botão + dialog com QR/link no HUD
-- `src/lib/webrtc/broadcaster.ts` — lógica do lado Quest (cria offer, gerencia múltiplos peers)
-- `src/lib/webrtc/viewer.ts` — lógica do lado viewer (recebe offer, monta `<video>`)
-- `src/lib/webrtc/signaling.ts` — wrapper sobre Supabase Realtime para troca SDP/ICE
+- **Performance**: GLB grandes somados podem derrubar FPS no Quest 3. Vou impor limite de **5 modelos simultâneos** com aviso.
+- **Conversão IFC**: cada arquivo passa pelo conversor cliente (`convertIFC.ts`) já existente — sem mudança.
+- **Colisão física**: as peças podem se sobrepor visualmente (não há detecção de colisão). Para "empilhar" o usuário posiciona manualmente via grab/fine-tuning. Snap entre peças seria uma evolução futura.
+- **Anotações em tela**: ficam vinculadas a coordenadas de mundo, não ao modelo — se você mover o modelo depois, a anotação não acompanha (limitação aceitável v1).
 
-**Editados:**
-- `src/App.tsx` — adicionar rota `/watch/:code` (pública, fora do layout XR)
-- `src/components/XRHud.tsx` — adicionar `<ShareButton />` na toolbar
-- `src/pages/XRSession.tsx` — botão também visível fora do HUD
-- `src/stores/useModelStore.ts` — estado `shareRoom: { code, viewerCount, isLive }`
+## Fora do escopo desta v1
 
-## Schema do banco (Lovable Cloud)
+- Snap automático/encaixe entre peças (próxima iteração)
+- Detecção de colisão / física
+- Agrupar peças (parent/child)
+- Checklist independente por peça
+- Persistência da cena multi-modelo (salvar/carregar layout)
 
-```sql
-create table public.share_rooms (
-  code text primary key,           -- 6 chars, ex: 'AB12CD'
-  created_at timestamptz default now(),
-  expires_at timestamptz default now() + interval '4 hours',
-  is_active boolean default true,
-  viewer_count int default 0
-);
+## Arquivos afetados
 
--- RLS: leitura pública (viewers precisam saber se sala existe), escrita só anon controlada
-alter table public.share_rooms enable row level security;
-create policy "anyone reads active rooms" on public.share_rooms
-  for select using (is_active and expires_at > now());
-create policy "anyone creates room" on public.share_rooms
-  for insert with check (true);
-create policy "anyone updates count" on public.share_rooms
-  for update using (true);
-```
-
-Signaling propriamente dito (SDP offers/answers, ICE candidates) acontece via **Supabase Realtime broadcast channel** `room:${code}` — não persiste em tabela, é efêmero.
-
-## STUN/TURN
-
-- **STUN público do Google** (`stun:stun.l.google.com:19302`) — grátis, resolve ~80% dos casos (NAT comum)
-- **TURN:** se inspetor estiver atrás de NAT simétrico (raro em fábrica), conexão falha. Para v1 deixamos só STUN. Se precisar TURN depois, integramos Twilio TURN (~$0,40/GB) ou Metered.ca (free tier 50GB/mês)
-
-## Captura no Quest — detalhes importantes
-
-Tem dois cenários:
-1. **Fora da sessão XR** (modo viewer 2D): `canvas.captureStream(30)` — fácil, funciona já
-2. **Dentro da sessão XR imersiva** (passthrough AR): aqui o canvas é renderizado para o display do headset, não para a tela visível. Solução: usar `XRWebGLLayer.framebuffer` e renderizar uma view extra "spectator" para um canvas offscreen que vira o stream. **Esta parte tem risco** — pode precisar fallback para `getDisplayMedia()` que pede permissão do usuário no Quest
-
-Plano: começar com cenário 1 (já cobre uso fora do AR imersivo), e cenário 2 numa segunda iteração se necessário.
-
-## Limitações honestas
-
-- **Latência:** 200-500ms (não é instantâneo, mas serve para acompanhamento)
-- **Sem áudio do microfone do Quest** na v1 (adicionar depois com `getUserMedia({audio:true})`)
-- **Sala expira em 4h** — geração de novo código se sessão durar mais
-- **Link público:** qualquer um com a URL vê. Se vazar, código pode ser revogado pelo inspetor
-- **Não grava** — só transmissão ao vivo. Gravação seria feature separada
-
-## Pré-requisito
-
-Precisa **habilitar Lovable Cloud** (atualmente o projeto não tem). Vou pedir confirmação antes de habilitar, pois cria infraestrutura backend.
-
-## Escopo desta implementação
-
-✅ Botão "Compartilhar" no HUD do XR + tela inicial
-✅ Geração de código + QR + link curto + Web Share API
-✅ Página `/watch/:code` pública com vídeo
-✅ Signaling via Supabase Realtime
-✅ WebRTC P2P 1→3 viewers
-✅ Contador de viewers em tempo real para o broadcaster
-✅ Captura via `canvas.captureStream` (cenário fora do XR imersivo)
-❌ Captura dentro da sessão XR imersiva (segunda iteração)
-❌ Áudio do mic (segunda iteração)
-❌ Chat / interação (você optou por read-only)
-❌ TURN server (só se aparecer problema de NAT)
-❌ Gravação
-
-Aprovando o plano, eu habilito o Lovable Cloud e implemento.
+- `src/stores/useModelStore.ts` — refactor central
+- `src/components/three/ModelViewer.tsx` — render por instância
+- `src/pages/Viewer.tsx` — painel de cena + botão "Adicionar"
+- `src/components/XRHud.tsx` — lista de peças no AR
+- `src/components/FineTuningControls.tsx` — opera no ativo
+- `src/components/ScaleSelector.tsx` — opera no ativo
+- `src/components/three/XRGrabbable.tsx` — grab por instância
+- novo `src/components/SceneModelList.tsx` — componente reutilizável da lista

From e8433bab7a4e85cdab4dbaed7f107fbd6835cb5b Mon Sep 17 00:00:00 2001
From: "gpt-engineer-app[bot]"
 <159125892+gpt-engineer-app[bot]@users.noreply.github.com>
Date: Thu, 14 May 2026 16:42:13 +0000
Subject: [PATCH 02/18] Changes

Co-authored-by: Reifonas <211114984+Reifonas@users.noreply.github.com>
---
 src/stores/useModelStore.ts | 157 +++++++++++++++++++++++++++++++++---
 1 file changed, 144 insertions(+), 13 deletions(-)

diff --git a/src/stores/useModelStore.ts b/src/stores/useModelStore.ts
index 6ddfdf9..c4f771e 100644
--- a/src/stores/useModelStore.ts
+++ b/src/stores/useModelStore.ts
@@ -37,6 +37,20 @@ interface FineTuning {
   scale: number;
 }
 
+export interface SceneModel {
+  id: string;
+  fileName: string;
+  fileSize: number;
+  url: string;
+  color: string;
+  visible: boolean;
+  locked: boolean;
+  fineTuning: FineTuning;
+}
+
+const MAX_MODELS = 5;
+const MODEL_COLORS = ['#3b82f6', '#22c55e', '#eab308', '#a855f7', '#ec4899'];
+
 type AnchorMode = 'tracking' | 'manual' | 'fine-tuning';
 type InspectionResult = 'pending' | 'approved' | 'rejected';
 type RenderMode = 'solid' | 'wireframe' | 'edges';
@@ -75,17 +89,32 @@ const defaultChecklist: ChecklistItem[] = [
   { id: 'weld', label: 'Especificação da Solda', status: 'pending', note: '', audioUrl: null },
 ];
 
+const defaultFineTuning: FineTuning = { posX: 0, posY: 0, posZ: 0, rotX: 0, rotY: 0, rotZ: 0, scale: 1 };
+
 interface ModelStore {
+  // ── Multi-model scene ─────────────
+  models: SceneModel[];
+  activeModelId: string | null;
+  addModel: (m: ModelInfo) => string; // returns id
+  removeModel: (id: string) => void;
+  setActiveModel: (id: string | null) => void;
+  toggleModelVisible: (id: string) => void;
+  toggleModelLocked: (id: string) => void;
+  duplicateModel: (id: string) => void;
+  clearAllModels: () => void;
+  maxModels: number;
+
+  // ── Legacy single-model accessors (proxy to active) ─────────────
   model: ModelInfo | null;
   setModel: (model: ModelInfo | null) => void;
-  
+
   fineTuning: FineTuning;
   setFineTuning: (ft: Partial<FineTuning>) => void;
   resetFineTuning: () => void;
-  
+
   anchorMode: AnchorMode;
   setAnchorMode: (mode: AnchorMode) => void;
-  
+
   inspectionResult: InspectionResult;
   setInspectionResult: (result: InspectionResult) => void;
 
@@ -144,19 +173,123 @@ interface ModelStore {
   clearScreenshots: () => void;
 }
 
-const defaultFineTuning: FineTuning = { posX: 0, posY: 0, posZ: 0, rotX: 0, rotY: 0, rotZ: 0, scale: 1 };
+/** Sync top-level legacy `model` / `fineTuning` from active SceneModel. */
+function syncActive(state: Pick<ModelStore, 'models' | 'activeModelId'>): { model: ModelInfo | null; fineTuning: FineTuning } {
+  const active = state.models.find(m => m.id === state.activeModelId) ?? null;
+  return {
+    model: active ? { fileName: active.fileName, fileSize: active.fileSize, url: active.url } : null,
+    fineTuning: active ? { ...active.fineTuning } : { ...defaultFineTuning },
+  };
+}
 
-export const useModelStore = create<ModelStore>((set) => ({
+export const useModelStore = create<ModelStore>((set, get) => ({
+  // ── Multi-model ─────────────
+  models: [],
+  activeModelId: null,
+  maxModels: MAX_MODELS,
+
+  addModel: (m) => {
+    const state = get();
+    if (state.models.length >= MAX_MODELS) {
+      return '';
+    }
+    const id = `mdl_${Date.now().toString(36)}_${Math.random().toString(36).slice(2, 6)}`;
+    const color = MODEL_COLORS[state.models.length % MODEL_COLORS.length];
+    // Stagger position so multiple models don't perfectly overlap
+    const offsetIdx = state.models.length;
+    const newModel: SceneModel = {
+      id,
+      fileName: m.fileName,
+      fileSize: m.fileSize,
+      url: m.url,
+      color,
+      visible: true,
+      locked: false,
+      fineTuning: { ...defaultFineTuning, posX: offsetIdx * 0.15 },
+    };
+    const models = [...state.models, newModel];
+    set({ models, activeModelId: id, ...syncActive({ models, activeModelId: id }) });
+    return id;
+  },
+
+  removeModel: (id) => {
+    const state = get();
+    const models = state.models.filter(m => m.id !== id);
+    const activeModelId = state.activeModelId === id
+      ? (models[0]?.id ?? null)
+      : state.activeModelId;
+    set({ models, activeModelId, ...syncActive({ models, activeModelId }) });
+  },
+
+  setActiveModel: (id) => {
+    const state = get();
+    set({ activeModelId: id, ...syncActive({ models: state.models, activeModelId: id }) });
+  },
+
+  toggleModelVisible: (id) => set((state) => ({
+    models: state.models.map(m => m.id === id ? { ...m, visible: !m.visible } : m),
+  })),
+
+  toggleModelLocked: (id) => set((state) => ({
+    models: state.models.map(m => m.id === id ? { ...m, locked: !m.locked } : m),
+  })),
+
+  duplicateModel: (id) => {
+    const state = get();
+    if (state.models.length >= MAX_MODELS) return;
+    const src = state.models.find(m => m.id === id);
+    if (!src) return;
+    const newId = `mdl_${Date.now().toString(36)}_${Math.random().toString(36).slice(2, 6)}`;
+    const color = MODEL_COLORS[state.models.length % MODEL_COLORS.length];
+    const copy: SceneModel = {
+      ...src,
+      id: newId,
+      color,
+      fineTuning: { ...src.fineTuning, posX: src.fineTuning.posX + 0.15 },
+    };
+    const models = [...state.models, copy];
+    set({ models, activeModelId: newId, ...syncActive({ models, activeModelId: newId }) });
+  },
+
+  clearAllModels: () => set({ models: [], activeModelId: null, model: null, fineTuning: { ...defaultFineTuning } }),
+
+  // ── Legacy single-model proxies ─────────────
   model: null,
-  setModel: (model) => set({ model }),
-  
+  setModel: (m) => {
+    if (!m) {
+      set({ models: [], activeModelId: null, model: null, fineTuning: { ...defaultFineTuning } });
+      return;
+    }
+    // Legacy: replace all models with this single one
+    const id = `mdl_${Date.now().toString(36)}_${Math.random().toString(36).slice(2, 6)}`;
+    const newModel: SceneModel = {
+      id, fileName: m.fileName, fileSize: m.fileSize, url: m.url,
+      color: MODEL_COLORS[0], visible: true, locked: false,
+      fineTuning: { ...defaultFineTuning },
+    };
+    set({ models: [newModel], activeModelId: id, ...syncActive({ models: [newModel], activeModelId: id }) });
+  },
+
   fineTuning: { ...defaultFineTuning },
-  setFineTuning: (ft) => set((state) => ({ fineTuning: { ...state.fineTuning, ...ft } })),
-  resetFineTuning: () => set({ fineTuning: { ...defaultFineTuning } }),
-  
+  setFineTuning: (ft) => set((state) => {
+    const newFT = { ...state.fineTuning, ...ft };
+    // Also write to the active model's fineTuning
+    const models = state.activeModelId
+      ? state.models.map(m => m.id === state.activeModelId ? { ...m, fineTuning: newFT } : m)
+      : state.models;
+    return { fineTuning: newFT, models };
+  }),
+  resetFineTuning: () => set((state) => {
+    const reset = { ...defaultFineTuning };
+    const models = state.activeModelId
+      ? state.models.map(m => m.id === state.activeModelId ? { ...m, fineTuning: reset } : m)
+      : state.models;
+    return { fineTuning: reset, models };
+  }),
+
   anchorMode: 'manual',
   setAnchorMode: (anchorMode) => set({ anchorMode }),
-  
+
   inspectionResult: 'pending',
   setInspectionResult: (inspectionResult) => set({ inspectionResult }),
 
@@ -213,8 +346,6 @@ export const useModelStore = create<ModelStore>((set) => ({
       const dy = (a.y - b.y) * 1000;
       const dz = (a.z - b.z) * 1000;
       const distanceWorldMM = Math.sqrt(dx * dx + dy * dy + dz * dz);
-      // Compensate for current render scale: world ≠ real when scaled.
-      // realMM = worldMM / factor (factor 1/50 → multiply by 50).
       const factor = state.scaleRatio?.factor ?? 1;
       const distanceMM = distanceWorldMM / factor;
       const measurement: Measurement = {

From 93ffc04eb690ea4ba6f4276bb3120d72ab67f63f Mon Sep 17 00:00:00 2001
From: "gpt-engineer-app[bot]"
 <159125892+gpt-engineer-app[bot]@users.noreply.github.com>
Date: Thu, 14 May 2026 16:42:34 +0000
Subject: [PATCH 03/18] Changes

Co-authored-by: Reifonas <211114984+Reifonas@users.noreply.github.com>
---
 src/components/SceneModelList.tsx | 121 ++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 src/components/SceneModelList.tsx

diff --git a/src/components/SceneModelList.tsx b/src/components/SceneModelList.tsx
new file mode 100644
index 0000000..0575237
--- /dev/null
+++ b/src/components/SceneModelList.tsx
@@ -0,0 +1,121 @@
+import { Eye, EyeOff, Lock, Unlock, Copy, Trash2, Box, Layers } from 'lucide-react';
+import { Button } from '@/components/ui/button';
+import { useModelStore } from '@/stores/useModelStore';
+import { toast } from 'sonner';
+
+interface SceneModelListProps {
+  compact?: boolean;
+}
+
+export function SceneModelList({ compact = false }: SceneModelListProps) {
+  const models = useModelStore((s) => s.models);
+  const activeId = useModelStore((s) => s.activeModelId);
+  const setActive = useModelStore((s) => s.setActiveModel);
+  const removeModel = useModelStore((s) => s.removeModel);
+  const toggleVisible = useModelStore((s) => s.toggleModelVisible);
+  const toggleLocked = useModelStore((s) => s.toggleModelLocked);
+  const duplicate = useModelStore((s) => s.duplicateModel);
+  const max = useModelStore((s) => s.maxModels);
+
+  if (models.length === 0) {
+    return (
+      <div className="rounded-lg border border-dashed bg-muted/20 p-3 text-center">
+        <Layers className="mx-auto mb-1 h-4 w-4 text-muted-foreground" />
+        <p className="font-mono text-[10px] text-muted-foreground">Nenhuma peça na cena</p>
+      </div>
+    );
+  }
+
+  const textSize = compact ? 'text-[9px]' : 'text-[11px]';
+  const padding = compact ? 'p-1.5' : 'p-2';
+
+  return (
+    <div className="space-y-1">
+      <div className="flex items-center justify-between">
+        <div className="flex items-center gap-1.5">
+          <Layers className="h-3 w-3 text-primary" />
+          <span className={`font-mono ${textSize} font-semibold uppercase tracking-wider text-muted-foreground`}>
+            Cena
+          </span>
+        </div>
+        <span className={`font-mono ${textSize} text-muted-foreground`}>
+          {models.length}/{max}
+        </span>
+      </div>
+
+      <div className="space-y-1">
+        {models.map((m) => {
+          const isActive = m.id === activeId;
+          return (
+            <div
+              key={m.id}
+              className={`flex items-center gap-1 rounded-md border ${padding} transition-colors cursor-pointer ${
+                isActive
+                  ? 'border-primary bg-primary/10'
+                  : 'border-border bg-muted/30 hover:bg-muted/50'
+              }`}
+              onClick={() => setActive(m.id)}
+            >
+              <div
+                className="h-2.5 w-2.5 shrink-0 rounded-full ring-1 ring-foreground/20"
+                style={{ backgroundColor: m.color }}
+                title="Cor da peça"
+              />
+              <Box className={`h-3 w-3 shrink-0 ${isActive ? 'text-primary' : 'text-muted-foreground'}`} />
+              <span className={`flex-1 truncate font-mono ${textSize} ${isActive ? 'text-foreground font-semibold' : 'text-muted-foreground'}`}>
+                {m.fileName}
+              </span>
+              <Button
+                variant="ghost"
+                size="icon"
+                className="h-5 w-5 shrink-0"
+                onClick={(e) => { e.stopPropagation(); toggleVisible(m.id); }}
+                title={m.visible ? 'Ocultar' : 'Exibir'}
+              >
+                {m.visible ? <Eye className="h-3 w-3" /> : <EyeOff className="h-3 w-3 text-muted-foreground" />}
+              </Button>
+              <Button
+                variant="ghost"
+                size="icon"
+                className="h-5 w-5 shrink-0"
+                onClick={(e) => { e.stopPropagation(); toggleLocked(m.id); }}
+                title={m.locked ? 'Destravar' : 'Travar'}
+              >
+                {m.locked ? <Lock className="h-3 w-3 text-warning" /> : <Unlock className="h-3 w-3 text-muted-foreground" />}
+              </Button>
+              <Button
+                variant="ghost"
+                size="icon"
+                className="h-5 w-5 shrink-0"
+                onClick={(e) => {
+                  e.stopPropagation();
+                  if (models.length >= max) {
+                    toast.error(`Limite de ${max} peças atingido`);
+                    return;
+                  }
+                  duplicate(m.id);
+                }}
+                title="Duplicar"
+              >
+                <Copy className="h-3 w-3" />
+              </Button>
+              <Button
+                variant="ghost"
+                size="icon"
+                className="h-5 w-5 shrink-0"
+                onClick={(e) => {
+                  e.stopPropagation();
+                  removeModel(m.id);
+                  toast.success(`"${m.fileName}" removido`);
+                }}
+                title="Remover"
+              >
+                <Trash2 className="h-3 w-3 text-destructive" />
+              </Button>
+            </div>
+          );
+        })}
+      </div>
+    </div>
+  );
+}

From f41399fe60b29d648ba1766a6b9bb1f29da8e3d3 Mon Sep 17 00:00:00 2001
From: "gpt-engineer-app[bot]"
 <159125892+gpt-engineer-app[bot]@users.noreply.github.com>
Date: Thu, 14 May 2026 16:42:44 +0000
Subject: [PATCH 04/18] Changes

Co-authored-by: Reifonas <211114984+Reifonas@users.noreply.github.com>
---
 src/components/CloudLoader.tsx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/components/CloudLoader.tsx b/src/components/CloudLoader.tsx
index f25c910..70945db 100644
--- a/src/components/CloudLoader.tsx
+++ b/src/components/CloudLoader.tsx
@@ -93,7 +93,9 @@ interface CloudLoaderProps {
 }
 
 export function CloudLoader({ compact = false, variant = 'outline', className }: CloudLoaderProps) {
-  const setModel = useModelStore((s) => s.setModel);
+  const addModel = useModelStore((s) => s.addModel);
+  const modelsCount = useModelStore((s) => s.models.length);
+  const maxModels = useModelStore((s) => s.maxModels);
   const [open, setOpen] = useState(false);
   const [url, setUrl] = useState(DEFAULT_URL);
   const [loading, setLoading] = useState(false);

From 995e539a40e2879ff5ce25f9d269e2589f10fe60 Mon Sep 17 00:00:00 2001
From: "gpt-engineer-app[bot]"
 <159125892+gpt-engineer-app[bot]@users.noreply.github.com>
Date: Thu, 14 May 2026 16:42:56 +0000
Subject: [PATCH 05/18] Changes

Co-authored-by: Reifonas <211114984+Reifonas@users.noreply.github.com>
---
 src/components/CloudLoader.tsx | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/components/CloudLoader.tsx b/src/components/CloudLoader.tsx
index 70945db..d8af547 100644
--- a/src/components/CloudLoader.tsx
+++ b/src/components/CloudLoader.tsx
@@ -102,6 +102,10 @@ export function CloudLoader({ compact = false, variant = 'outline', className }:
 
   const handleLoad = useCallback(async (rawUrl: string) => {
     if (!rawUrl) return;
+    if (modelsCount >= maxModels) {
+      toast.error(`Limite de ${maxModels} peças simultâneas atingido. Remova uma antes de adicionar outra.`);
+      return;
+    }
     setLoading(true);
     try {
       const fileName = rawUrl.split('/').pop()?.split('?')[0] || 'modelo-cloud';
@@ -125,8 +129,8 @@ export function CloudLoader({ compact = false, variant = 'outline', className }:
         blob = r.blob; outName = r.fileName; outSize = r.fileSize;
       }
       const blobUrl = URL.createObjectURL(blob);
-      setModel({ fileName: outName, fileSize: outSize, url: blobUrl });
-      toast.success(`"${outName}" carregado da nuvem`);
+      addModel({ fileName: outName, fileSize: outSize, url: blobUrl });
+      toast.success(`"${outName}" adicionado à cena`);
       setOpen(false);
     } catch (err) {
       console.error(err);
@@ -134,7 +138,7 @@ export function CloudLoader({ compact = false, variant = 'outline', className }:
     } finally {
       setLoading(false);
     }
-  }, [setModel]);
+  }, [addModel, modelsCount, maxModels]);
 
   return (
     <Dialog open={open} onOpenChange={setOpen}>

From 6fc9621855565a5f00f8ea75abda3dea5e4bde98 Mon Sep 17 00:00:00 2001
From: "gpt-engineer-app[bot]"
 <159125892+gpt-engineer-app[bot]@users.noreply.github.com>
Date: Thu, 14 May 2026 16:43:04 +0000
Subject: [PATCH 06/18] Changes

Co-authored-by: Reifonas <211114984+Reifonas@users.noreply.github.com>
---
 src/pages/Index.tsx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/pages/Index.tsx b/src/pages/Index.tsx
index 3f5cff1..e0cd98e 100644
--- a/src/pages/Index.tsx
+++ b/src/pages/Index.tsx
@@ -15,7 +15,7 @@ const Index = () => {
   const [loadingDemoCotovelo, setLoadingDemoCotovelo] = useState(false);
   
   const [converting, setConverting] = useState(false);
-  const { model, setModel, xrSupported, setXrSupported } = useModelStore();
+  const { model, addModel, models, maxModels, xrSupported, setXrSupported } = useModelStore();
 
   useEffect(() => {
     if (navigator.xr) {

From 85b96dec77f4059627127a58d65493131a61d023 Mon Sep 17 00:00:00 2001
From: "gpt-engineer-app[bot]"
 <159125892+gpt-engineer-app[bot]@users.noreply.github.com>
Date: Thu, 14 May 2026 16:43:11 +0000
Subject: [PATCH 07/18] Changes

Co-authored-by: Reifonas <211114984+Reifonas@users.noreply.github.com>
---
 src/pages/Index.tsx | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/src/pages/Index.tsx b/src/pages/Index.tsx
index e0cd98e..5e167fb 100644
--- a/src/pages/Index.tsx
+++ b/src/pages/Index.tsx
@@ -37,7 +37,7 @@ const Index = () => {
 
     if (ext === 'glb') {
       const url = URL.createObjectURL(file);
-      setModel({ fileName: file.name, fileSize: file.size, url });
+      addModel({ fileName: file.name, fileSize: file.size, url });
       toast.success(`Modelo "${file.name}" carregado com sucesso!`);
       return;
     }
@@ -53,7 +53,7 @@ const Index = () => {
         result = await convertToGLB(buffer, ext, file.name);
       }
       const url = URL.createObjectURL(result.blob);
-      setModel({ fileName: result.fileName, fileSize: result.fileSize, url });
+      addModel({ fileName: result.fileName, fileSize: result.fileSize, url });
       toast.success(`"${file.name}" convertido para GLB e carregado!`);
     } catch (err) {
       console.error(err);
@@ -61,7 +61,7 @@ const Index = () => {
     } finally {
       setConverting(false);
     }
-  }, [setModel]);
+  }, [addModel]);
 
   // Carregar da Nuvem agora é encapsulado em <CloudLoader />
 
@@ -72,7 +72,7 @@ const Index = () => {
       const buffer = await response.arrayBuffer();
       const result = await convertIFCtoGLB(buffer, 'demo250hp.ifc');
       const url = URL.createObjectURL(result.blob);
-      setModel({ fileName: result.fileName, fileSize: result.fileSize, url });
+      addModel({ fileName: result.fileName, fileSize: result.fileSize, url });
       toast.success('Modelo demo "250 HP" (IFC) carregado!');
     } catch (err) {
       console.error(err);
@@ -80,7 +80,7 @@ const Index = () => {
     } finally {
       setLoadingDemoIFC(false);
     }
-  }, [setModel]);
+  }, [addModel]);
 
   const handleLoadDemoCotovelo = useCallback(async () => {
     setLoadingDemoCotovelo(true);
@@ -89,7 +89,7 @@ const Index = () => {
       const buffer = await response.arrayBuffer();
       const result = await convertIFCtoGLB(buffer, 'B126-COTOVELO.ifc');
       const url = URL.createObjectURL(result.blob);
-      setModel({ fileName: result.fileName, fileSize: result.fileSize, url });
+      addModel({ fileName: result.fileName, fileSize: result.fileSize, url });
       toast.success('Modelo demo "B126 Cotovelo" (IFC) carregado!');
     } catch (err) {
       console.error(err);
@@ -97,7 +97,7 @@ const Index = () => {
     } finally {
       setLoadingDemoCotovelo(false);
     }
-  }, [setModel]);
+  }, [addModel]);
 
   const handleEnterViewer = () => {
     if (!model) {

From 0512de9fcdceeb6b007d773ccbd4e23db8fcaa5f Mon Sep 17 00:00:00 2001
From: "gpt-engineer-app[bot]"
 <159125892+gpt-engineer-app[bot]@users.noreply.github.com>
Date: Thu, 14 May 2026 16:43:16 +0000
Subject: [PATCH 08/18] Changes

Co-authored-by: Reifonas <211114984+Reifonas@users.noreply.github.com>
---
 src/pages/Index.tsx | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/pages/Index.tsx b/src/pages/Index.tsx
index 5e167fb..d303ac2 100644
--- a/src/pages/Index.tsx
+++ b/src/pages/Index.tsx
@@ -7,6 +7,7 @@ import { toast } from 'sonner';
 import { getSupportedExtension, convertToGLB, ACCEPTED_EXTENSIONS } from '@/lib/convertToGLB';
 import { convertIFCtoGLB } from '@/lib/convertIFC';
 import { CloudLoader } from '@/components/CloudLoader';
+import { SceneModelList } from '@/components/SceneModelList';
 
 const Index = () => {
   const navigate = useNavigate();

From bfc303479c016d2c110b233baa4356f2e9809e32 Mon Sep 17 00:00:00 2001
From: "gpt-engineer-app[bot]"
 <159125892+gpt-engineer-app[bot]@users.noreply.github.com>
Date: Thu, 14 May 2026 16:43:25 +0000
Subject: [PATCH 09/18] Changes

Co-authored-by: Reifonas <211114984+Reifonas@users.noreply.github.com>
---
 src/pages/Index.tsx | 22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/src/pages/Index.tsx b/src/pages/Index.tsx
index d303ac2..6e570c2 100644
--- a/src/pages/Index.tsx
+++ b/src/pages/Index.tsx
@@ -171,20 +171,16 @@ const Index = () => {
         </div>
 
 
-        {model &&
-        <div className="rounded-lg border border-primary/30 bg-primary/5 p-4 glow-primary">
-            <div className="flex items-center gap-3">
-              <Box className="h-5 w-5 text-primary" />
-              <div className="min-w-0 flex-1">
-                <p className="truncate font-mono text-sm font-medium text-foreground">{model.fileName}</p>
-                <p className="text-xs text-muted-foreground">
-                  {(model.fileSize / (1024 * 1024)).toFixed(2)} MB
-                </p>
-              </div>
-              <CheckCircle className="h-5 w-5 text-success shrink-0" />
-            </div>
+        {models.length > 0 && (
+          <div className="rounded-lg border border-primary/30 bg-primary/5 p-3 glow-primary">
+            <SceneModelList />
+            <p className="mt-2 text-center font-mono text-[10px] text-muted-foreground">
+              {models.length < maxModels
+                ? `Você pode adicionar mais ${maxModels - models.length} peça(s) à cena`
+                : `Limite de ${maxModels} peças simultâneas atingido`}
+            </p>
           </div>
-        }
+        )}
 
         {/* Enter viewer */}
         <Button

From a8921c33b50eb7cc4b4f5ae26a5297300d9e8330 Mon Sep 17 00:00:00 2001
From: "gpt-engineer-app[bot]"
 <159125892+gpt-engineer-app[bot]@users.noreply.github.com>
Date: Thu, 14 May 2026 16:43:36 +0000
Subject: [PATCH 10/18] Changes

Co-authored-by: Reifonas <211114984+Reifonas@users.noreply.github.com>
---
 src/components/three/ModelViewer.tsx | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/components/three/ModelViewer.tsx b/src/components/three/ModelViewer.tsx
index 2a33327..ff5aec5 100644
--- a/src/components/three/ModelViewer.tsx
+++ b/src/components/three/ModelViewer.tsx
@@ -3,11 +3,11 @@ import { Canvas, useThree, useFrame } from '@react-three/fiber';
 import { OrbitControls, useGLTF, Grid, Html, Line } from '@react-three/drei';
 import { Loader2 } from 'lucide-react';
 import * as THREE from 'three';
-import { useModelStore } from '@/stores/useModelStore';
+import { useModelStore, type SceneModel } from '@/stores/useModelStore';
 import { findNearestVertex, detectHoleAtFace, findNearestEdgeSegment } from './SmartMeasure';
 
 interface ModelViewerProps {
-  url: string;
+  url?: string; // legacy, ignored — uses store.models
 }
 
 function LoadingFallback() {

From e10a9c433ac015512b26afcd1df52db5ae578b1f Mon Sep 17 00:00:00 2001
From: "gpt-engineer-app[bot]"
 <159125892+gpt-engineer-app[bot]@users.noreply.github.com>
Date: Thu, 14 May 2026 16:44:02 +0000
Subject: [PATCH 11/18] Changes

Co-authored-by: Reifonas <211114984+Reifonas@users.noreply.github.com>
---
 src/components/three/ModelViewer.tsx | 43 +++++++++++++++++++++-------
 1 file changed, 33 insertions(+), 10 deletions(-)

diff --git a/src/components/three/ModelViewer.tsx b/src/components/three/ModelViewer.tsx
index ff5aec5..a5f56e1 100644
--- a/src/components/three/ModelViewer.tsx
+++ b/src/components/three/ModelViewer.tsx
@@ -21,8 +21,10 @@ function LoadingFallback() {
   );
 }
 
-function GLBModel({ url }: { url: string }) {
-  const { scene } = useGLTF(url);
+function GLBModel({ sceneModel, isActive }: { sceneModel: SceneModel; isActive: boolean }) {
+  const { scene: rawScene } = useGLTF(sceneModel.url);
+  // Clone scene per instance so multiple GLBModels with same url don't share materials/transforms
+  const scene = useMemo(() => rawScene.clone(true), [rawScene]);
   const ref = useRef<THREE.Group>(null);
   const opacity = useModelStore((s) => s.opacity);
   const renderMode = useModelStore((s) => s.renderMode);
@@ -30,7 +32,8 @@ function GLBModel({ url }: { url: string }) {
   const wireframeThickness = useModelStore((s) => s.wireframeThickness);
   const edgeThresholdAngle = useModelStore((s) => s.edgeThresholdAngle);
   const checklist = useModelStore((s) => s.checklist);
-  const fineTuning = useModelStore((s) => s.fineTuning);
+  const setActive = useModelStore((s) => s.setActiveModel);
+  const fineTuning = sceneModel.fineTuning;
 
   const modelInfo = useMemo(() => {
     const box = new THREE.Box3().setFromObject(scene);
@@ -41,7 +44,6 @@ function GLBModel({ url }: { url: string }) {
     return { size, center };
   }, [scene]);
 
-  // Store original colors so we can restore them
   const originalColors = useRef<Map<THREE.Material, THREE.Color>>(new Map());
 
   useEffect(() => {
@@ -56,7 +58,6 @@ function GLBModel({ url }: { url: string }) {
           child.material = child.material.clone();
         }
 
-        // Clean up previous edge lines
         const toRemove: THREE.Object3D[] = [];
         child.children.forEach(c => {
           if (c.userData.__edgeLine) toRemove.push(c);
@@ -72,7 +73,6 @@ function GLBModel({ url }: { url: string }) {
         const materials = Array.isArray(child.material) ? child.material : [child.material];
         materials.forEach((mat: THREE.Material) => {
           if (mat instanceof THREE.MeshStandardMaterial) {
-            // Store original color on first encounter
             if (!originalColors.current.has(mat)) {
               originalColors.current.set(mat, mat.color.clone());
             }
@@ -92,14 +92,14 @@ function GLBModel({ url }: { url: string }) {
               } else if (allApproved) {
                 mat.color.setHSL(0.38, 0.7, 0.45);
               } else {
-                mat.color.set(0x8899aa);
+                // Tint with the per-model color (subtle)
+                mat.color.set(sceneModel.color);
               }
             }
             mat.needsUpdate = true;
           }
         });
 
-        // Create edge lines for edges mode
         if (renderMode === 'edges' && child.geometry) {
           const edgesGeo = new THREE.EdgesGeometry(child.geometry, edgeThresholdAngle);
           const lineMat = new THREE.LineBasicMaterial({
@@ -112,7 +112,7 @@ function GLBModel({ url }: { url: string }) {
         }
       }
     });
-  }, [scene, opacity, renderMode, checklist, wireframeColor, wireframeThickness, edgeThresholdAngle]);
+  }, [scene, opacity, renderMode, checklist, wireframeColor, wireframeThickness, edgeThresholdAngle, sceneModel.color]);
 
   const rotXRad = (fineTuning.rotX * Math.PI) / 180;
   const rotYRad = (fineTuning.rotY * Math.PI) / 180;
@@ -121,8 +121,13 @@ function GLBModel({ url }: { url: string }) {
   const scaleRatio = useModelStore((st) => st.scaleRatio);
   const renderFactor = scaleRatio?.factor ?? 1;
 
+  if (!sceneModel.visible) return null;
+
   return (
-    <group scale={[renderFactor, renderFactor, renderFactor]}>
+    <group
+      scale={[renderFactor, renderFactor, renderFactor]}
+      onClick={(e) => { e.stopPropagation(); setActive(sceneModel.id); }}
+    >
       <group
         ref={ref}
         position={[
@@ -134,11 +139,29 @@ function GLBModel({ url }: { url: string }) {
         scale={[s, s, s]}
       >
         <primitive object={scene} />
+        {isActive && (
+          <mesh>
+            <boxGeometry args={[modelInfo.size.x * 1.05, modelInfo.size.y * 1.05, modelInfo.size.z * 1.05]} />
+            <meshBasicMaterial color={sceneModel.color} wireframe transparent opacity={0.25} />
+          </mesh>
+        )}
       </group>
     </group>
   );
 }
 
+function SceneModels() {
+  const models = useModelStore((s) => s.models);
+  const activeId = useModelStore((s) => s.activeModelId);
+  return (
+    <>
+      {models.map((m) => (
+        <GLBModel key={m.id} sceneModel={m} isActive={m.id === activeId} />
+      ))}
+    </>
+  );
+}
+
 /** Sphere marker at a 3D point */
 function PointMarker({ position, color = '#e8a838' }: { position: [number, number, number]; color?: string }) {
   return (

From 9b3f540f78a7061f3941e6afd4d055a371da1167 Mon Sep 17 00:00:00 2001
From: "gpt-engineer-app[bot]"
 <159125892+gpt-engineer-app[bot]@users.noreply.github.com>
Date: Thu, 14 May 2026 16:44:12 +0000
Subject: [PATCH 12/18] Changes

Co-authored-by: Reifonas <211114984+Reifonas@users.noreply.github.com>
---
 src/components/three/ModelViewer.tsx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/components/three/ModelViewer.tsx b/src/components/three/ModelViewer.tsx
index a5f56e1..f18e8ce 100644
--- a/src/components/three/ModelViewer.tsx
+++ b/src/components/three/ModelViewer.tsx
@@ -495,7 +495,7 @@ export function ModelViewerCanvas({ url }: ModelViewerProps) {
       <directionalLight position={[-5, 5, -5]} intensity={0.3} />
       
       <Suspense fallback={<LoadingFallback />}>
-        <GLBModel url={url} />
+        <SceneModels />
       </Suspense>
 
       <MeasurementOverlay />

From 2d96ab1a07da5113725e1115a13d2060b938d385 Mon Sep 17 00:00:00 2001
From: "gpt-engineer-app[bot]"
 <159125892+gpt-engineer-app[bot]@users.noreply.github.com>
Date: Thu, 14 May 2026 16:44:27 +0000
Subject: [PATCH 13/18] Changes

Co-authored-by: Reifonas <211114984+Reifonas@users.noreply.github.com>
---
 src/pages/Viewer.tsx | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/pages/Viewer.tsx b/src/pages/Viewer.tsx
index fed6695..d19e899 100644
--- a/src/pages/Viewer.tsx
+++ b/src/pages/Viewer.tsx
@@ -1,5 +1,5 @@
 import { useNavigate } from "react-router-dom";
-import { ArrowLeft, Glasses, Box, Ruler, FileText } from "lucide-react";
+import { ArrowLeft, Glasses, Box, Ruler, FileText, Upload, Loader2 } from "lucide-react";
 import { Button } from "@/components/ui/button";
 import { useModelStore } from "@/stores/useModelStore";
 import { ModelViewerCanvas } from "@/components/three/ModelViewer";
@@ -9,10 +9,14 @@ import { FineTuningControls } from "@/components/FineTuningControls";
 import { MeasurementsList } from "@/components/MeasurementsList";
 import { ScreenshotGallery } from "@/components/ScreenshotGallery";
 import { ShareButton } from "@/components/ShareButton";
-import { useEffect } from "react";
+import { CloudLoader } from "@/components/CloudLoader";
+import { SceneModelList } from "@/components/SceneModelList";
+import { useEffect, useRef, useCallback, useState } from "react";
 import { toast } from "sonner";
 import { ScrollArea } from "@/components/ui/scroll-area";
 import { Separator } from "@/components/ui/separator";
+import { getSupportedExtension, convertToGLB, ACCEPTED_EXTENSIONS } from "@/lib/convertToGLB";
+import { convertIFCtoGLB } from "@/lib/convertIFC";
 
 const Viewer = () => {
   const navigate = useNavigate();

From 06f645f3ee3679b9a65a871676c47133a0c28eab Mon Sep 17 00:00:00 2001
From: "gpt-engineer-app[bot]"
 <159125892+gpt-engineer-app[bot]@users.noreply.github.com>
Date: Thu, 14 May 2026 16:44:54 +0000
Subject: [PATCH 14/18] Changes

Co-authored-by: Reifonas <211114984+Reifonas@users.noreply.github.com>
---
 src/pages/Viewer.tsx | 85 ++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 79 insertions(+), 6 deletions(-)

diff --git a/src/pages/Viewer.tsx b/src/pages/Viewer.tsx
index d19e899..3a8a672 100644
--- a/src/pages/Viewer.tsx
+++ b/src/pages/Viewer.tsx
@@ -20,7 +20,9 @@ import { convertIFCtoGLB } from "@/lib/convertIFC";
 
 const Viewer = () => {
   const navigate = useNavigate();
-  const { model, xrSupported } = useModelStore();
+  const { model, xrSupported, addModel, models, maxModels } = useModelStore();
+  const fileInputRef = useRef<HTMLInputElement>(null);
+  const [converting, setConverting] = useState(false);
 
   useEffect(() => {
     if (!model) {
@@ -28,6 +30,42 @@ const Viewer = () => {
     }
   }, [model, navigate]);
 
+  const handleFileUpload = useCallback(async (e: React.ChangeEvent<HTMLInputElement>) => {
+    const file = e.target.files?.[0];
+    e.target.value = '';
+    if (!file) return;
+    if (models.length >= maxModels) {
+      toast.error(`Limite de ${maxModels} peças simultâneas atingido`);
+      return;
+    }
+    const ext = getSupportedExtension(file.name);
+    if (!ext) {
+      toast.error('Formato inválido. Selecione .GLB, .OBJ, .STL ou .IFC');
+      return;
+    }
+    if (ext === 'glb') {
+      const url = URL.createObjectURL(file);
+      addModel({ fileName: file.name, fileSize: file.size, url });
+      toast.success(`"${file.name}" adicionado à cena`);
+      return;
+    }
+    setConverting(true);
+    try {
+      const buffer = await file.arrayBuffer();
+      const result = ext === 'ifc'
+        ? await convertIFCtoGLB(buffer, file.name)
+        : await convertToGLB(buffer, ext, file.name);
+      const url = URL.createObjectURL(result.blob);
+      addModel({ fileName: result.fileName, fileSize: result.fileSize, url });
+      toast.success(`"${file.name}" convertido e adicionado!`);
+    } catch (err) {
+      console.error(err);
+      toast.error(`Falha ao converter "${file.name}"`);
+    } finally {
+      setConverting(false);
+    }
+  }, [addModel, models.length, maxModels]);
+
   if (!model) return null;
 
   const handleEnterXR = async () => {
@@ -38,8 +76,18 @@ const Viewer = () => {
     navigate("/xr");
   };
 
+  const canAddMore = models.length < maxModels;
+
   return (
     <div className="flex h-screen flex-col bg-background">
+      <input
+        ref={fileInputRef}
+        type="file"
+        accept={ACCEPTED_EXTENSIONS}
+        className="hidden"
+        onChange={handleFileUpload}
+      />
+
       {/* Top bar */}
       <header className="flex items-center justify-between border-b bg-card px-4 py-3">
         <div className="flex items-center gap-3">
@@ -66,7 +114,7 @@ const Viewer = () => {
       <div className="flex flex-1 overflow-hidden">
         {/* 3D Canvas with floating controls */}
         <div className="relative flex-1">
-          <ModelViewerCanvas url={model.url} />
+          <ModelViewerCanvas />
           <ViewerControls />
         </div>
 
@@ -75,8 +123,33 @@ const Viewer = () => {
           <ScrollArea className="h-full">
             <div className="p-4 space-y-5">
               <div>
-                <h2 className="mb-3 font-mono text-xs font-semibold uppercase tracking-widest text-muted-foreground">
-                  Informações do Modelo
+                <div className="flex items-center justify-between mb-3">
+                  <h2 className="font-mono text-xs font-semibold uppercase tracking-widest text-muted-foreground">
+                    Cena · {models.length}/{maxModels} peças
+                  </h2>
+                </div>
+                <SceneModelList />
+                <div className="mt-2 grid grid-cols-2 gap-1.5">
+                  <Button
+                    variant="outline"
+                    size="sm"
+                    className="h-8 gap-1.5 text-[10px] font-mono"
+                    onClick={() => fileInputRef.current?.click()}
+                    disabled={!canAddMore || converting}
+                    title={canAddMore ? 'Adicionar arquivo local' : 'Limite atingido'}
+                  >
+                    {converting ? <Loader2 className="h-3.5 w-3.5 animate-spin" /> : <Upload className="h-3.5 w-3.5" />}
+                    {converting ? 'Convertendo…' : 'Adicionar'}
+                  </Button>
+                  <CloudLoader compact variant="outline" />
+                </div>
+              </div>
+
+              <Separator />
+
+              <div>
+                <h2 className="mb-2 font-mono text-xs font-semibold uppercase tracking-widest text-muted-foreground">
+                  Peça selecionada
                 </h2>
                 <div className="space-y-3">
                   <InfoItem icon={FileText} label="Arquivo" value={model.fileName} />
@@ -102,8 +175,8 @@ const Viewer = () => {
               <ScreenshotGallery />
               <div className="rounded-lg border bg-muted/50 p-3">
                 <p className="font-mono text-xs text-muted-foreground">
-                  Use o mouse para orbitar, scroll para zoom. Controle a opacidade e o modo de renderização nos
-                  controles flutuantes.
+                  Clique em uma peça na cena para selecioná-la — os controles de ajuste fino
+                  passam a operar sobre ela. Use "Adicionar" / "Nuvem" para empilhar peças.
                 </p>
               </div>
             </div>

From b302b91de9423e15c52805a48fc7ad83bcd36677 Mon Sep 17 00:00:00 2001
From: "gpt-engineer-app[bot]"
 <159125892+gpt-engineer-app[bot]@users.noreply.github.com>
Date: Thu, 14 May 2026 16:45:24 +0000
Subject: [PATCH 15/18] Changes

Co-authored-by: Reifonas <211114984+Reifonas@users.noreply.github.com>
---
 src/pages/XRSession.tsx | 36 ++++++++++++++++++++++++++++++------
 1 file changed, 30 insertions(+), 6 deletions(-)

diff --git a/src/pages/XRSession.tsx b/src/pages/XRSession.tsx
index 9c33a90..3ffb5f8 100644
--- a/src/pages/XRSession.tsx
+++ b/src/pages/XRSession.tsx
@@ -32,10 +32,11 @@ const store = createXRStore({
 });
 
 // ─── XRModel ───────────────────────────────────────────
-function XRModel({ url }: { url: string }) {
-  const { scene } = useGLTF(url);
+function XRModel({ sceneModel }: { sceneModel: import('@/stores/useModelStore').SceneModel }) {
+  const { scene: rawScene } = useGLTF(sceneModel.url);
+  const scene = useMemo(() => rawScene.clone(true), [rawScene]);
   const ref = useRef<THREE.Group>(null);
-  const fineTuning = useModelStore((s) => s.fineTuning);
+  const fineTuning = sceneModel.fineTuning;
   const opacity = useModelStore((s) => s.opacity);
   const renderMode = useModelStore((s) => s.renderMode);
   const wireframeColor = useModelStore((s) => s.wireframeColor);
@@ -64,7 +65,6 @@ function XRModel({ url }: { url: string }) {
           child.material = child.material.clone();
         }
 
-        // Clean up previous edge lines
         const toRemove: THREE.Object3D[] = [];
         child.children.forEach(c => {
           if (c.userData.__edgeLine) toRemove.push(c);
@@ -95,7 +95,7 @@ function XRModel({ url }: { url: string }) {
               } else if (allApproved) {
                 mat.color.setHSL(0.38, 0.7, 0.45);
               } else {
-                mat.color.set(0x8899aa);
+                mat.color.set(sceneModel.color);
               }
             }
             mat.needsUpdate = true;
@@ -111,7 +111,7 @@ function XRModel({ url }: { url: string }) {
         }
       }
     });
-  }, [scene, opacity, renderMode, checklist, wireframeColor, wireframeThickness, edgeThresholdAngle]);
+  }, [scene, opacity, renderMode, checklist, wireframeColor, wireframeThickness, edgeThresholdAngle, sceneModel.color]);
 
   const rotXRad = (fineTuning.rotX * Math.PI) / 180;
   const rotYRad = (fineTuning.rotY * Math.PI) / 180;
@@ -120,6 +120,8 @@ function XRModel({ url }: { url: string }) {
   const scaleRatio = useModelStore((st) => st.scaleRatio);
   const renderFactor = scaleRatio?.factor ?? 1;
 
+  if (!sceneModel.visible) return null;
+
   return (
     <group scale={[renderFactor, renderFactor, renderFactor]}>
       <group
@@ -138,6 +140,28 @@ function XRModel({ url }: { url: string }) {
   );
 }
 
+/** Renders all NON-active models as static background (placement + grab apply only to active). */
+function XRBackgroundModels() {
+  const models = useModelStore((s) => s.models);
+  const activeId = useModelStore((s) => s.activeModelId);
+  return (
+    <>
+      {models.filter(m => m.id !== activeId).map((m) => (
+        <XRModel key={m.id} sceneModel={m} />
+      ))}
+    </>
+  );
+}
+
+/** Renders the currently-active model (the one wrapped by grab/placement). */
+function XRActiveModel() {
+  const models = useModelStore((s) => s.models);
+  const activeId = useModelStore((s) => s.activeModelId);
+  const active = models.find(m => m.id === activeId);
+  if (!active) return null;
+  return <XRModel sceneModel={active} />;
+}
+
 // ─── ControllerFineTuning ──────────────────────────────
 // Joystick for slow numeric adjustments. Disabled while any grip is held
 // (grab takes priority). Trigger pressure modulates speed: light = fine,

From 306ddef061eba795015459ba77099e1272fdddab Mon Sep 17 00:00:00 2001
From: "gpt-engineer-app[bot]"
 <159125892+gpt-engineer-app[bot]@users.noreply.github.com>
Date: Thu, 14 May 2026 16:45:43 +0000
Subject: [PATCH 16/18] Changes

Co-authored-by: Reifonas <211114984+Reifonas@users.noreply.github.com>
---
 src/pages/XRSession.tsx | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/pages/XRSession.tsx b/src/pages/XRSession.tsx
index 3ffb5f8..f612423 100644
--- a/src/pages/XRSession.tsx
+++ b/src/pages/XRSession.tsx
@@ -533,14 +533,15 @@ const XRSession = () => {
 
             {effectiveInXR ? (
               <>
-                {/* In XR (or SimXR): grab wrapper → model. Skip hit-test in SimXR mode. */}
+                {/* In XR (or SimXR): grab wrapper → ACTIVE model. Other models render as static background. */}
+                <XRBackgroundModels />
                 {simXR ? (
                   <group position={[0, 1.0, -1.2]}>
                     <XRGrabbable
                       allowScale={allowScale}
                       onGrabStart={() => { if (placementMode) setPlacementMode(false); }}
                     >
-                      <XRModel url={model.url} />
+                      <XRActiveModel />
                     </XRGrabbable>
                   </group>
                 ) : (
@@ -556,7 +557,7 @@ const XRSession = () => {
                       allowScale={allowScale}
                       onGrabStart={() => { if (placementMode) setPlacementMode(false); }}
                     >
-                      <XRModel url={model.url} />
+                      <XRActiveModel />
                     </XRGrabbable>
                   </XRHitTestPlacement>
                 )}
@@ -580,9 +581,10 @@ const XRSession = () => {
               </>
             ) : (
               <>
-                {/* Desktop preview (no headset): show model with OrbitControls */}
+                {/* Desktop preview (no headset): show all models with OrbitControls */}
                 <group position={[0, 0, 0]}>
-                  <XRModel url={model.url} />
+                  <XRBackgroundModels />
+                  <XRActiveModel />
                 </group>
                 <XRMeasurementOverlay />
                 <OrbitControls

From 1d93a1bc038519bfd7b7cf9880c49f9be31eaffa Mon Sep 17 00:00:00 2001
From: "gpt-engineer-app[bot]"
 <159125892+gpt-engineer-app[bot]@users.noreply.github.com>
Date: Thu, 14 May 2026 16:45:51 +0000
Subject: [PATCH 17/18] Changes

Co-authored-by: Reifonas <211114984+Reifonas@users.noreply.github.com>
---
 src/components/XRHud.tsx | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/components/XRHud.tsx b/src/components/XRHud.tsx
index 30d04a2..cdc9c19 100644
--- a/src/components/XRHud.tsx
+++ b/src/components/XRHud.tsx
@@ -12,6 +12,7 @@ import { InspectionChecklist } from '@/components/InspectionChecklist';
 import { ScaleSelector } from '@/components/ScaleSelector';
 import { CloudLoader } from '@/components/CloudLoader';
 import { ShareButton } from '@/components/ShareButton';
+import { SceneModelList } from '@/components/SceneModelList';
 import { toast } from 'sonner';
 
 const POSITION_STEP = 0.001;

From a9ba99e06fc5db417fae7fc9a85c768b8c8ee6f6 Mon Sep 17 00:00:00 2001
From: "gpt-engineer-app[bot]"
 <159125892+gpt-engineer-app[bot]@users.noreply.github.com>
Date: Thu, 14 May 2026 16:46:07 +0000
Subject: [PATCH 18/18] Changes

Co-authored-by: Reifonas <211114984+Reifonas@users.noreply.github.com>
---
 src/components/XRHud.tsx | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/components/XRHud.tsx b/src/components/XRHud.tsx
index cdc9c19..5416d11 100644
--- a/src/components/XRHud.tsx
+++ b/src/components/XRHud.tsx
@@ -198,7 +198,10 @@ export function XRHud({ freeMove, onToggleFreeMove, placementMode = false, onTog
         <div className="pointer-events-auto mx-auto max-w-lg space-y-2">
           {/* Expanded panel */}
           {expanded && (
-            <div className="rounded-xl border bg-card/90 backdrop-blur-md p-3 shadow-2xl space-y-3 animate-in slide-in-from-bottom-2 duration-200">
+            <div className="rounded-xl border bg-card/90 backdrop-blur-md p-3 shadow-2xl space-y-3 animate-in slide-in-from-bottom-2 duration-200 max-h-[60vh] overflow-y-auto">
+              {/* Scene models list */}
+              <SceneModelList compact />
+
               {/* Opacity */}
               <div>
                 <div className="flex items-center justify-between mb-1.5">