feat: add 3D preview component and integrate it into the designer page

app/components/designer/ThreeDPreview.vue

@@ -0,0 +1,174 @@
+<script setup lang="ts">
+import { onMounted, onBeforeUnmount, ref, watch } from 'vue';
+import * as THREE from 'three';
+import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader.js';
+import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js';
+
+const props = defineProps<{
+  modelPath: string;
+  canvasTexture?: HTMLCanvasElement | null;
+}>();
+
+const containerRef = ref<HTMLDivElement | null>(null);
+
+let scene: THREE.Scene;
+let camera: THREE.PerspectiveCamera;
+let renderer: THREE.WebGLRenderer;
+let controls: OrbitControls;
+let model: THREE.Object3D | null = null;
+let jerseyMaterial: THREE.MeshStandardMaterial | null = null;
+let animationFrameId: number;
+
+const setupScene = () => {
+  if (!containerRef.value) return;
+
+  // Scene
+  scene = new THREE.Scene();
+  scene.background = new THREE.Color(0x1e293b);
+
+  // Camera
+  camera = new THREE.PerspectiveCamera(
+    45,
+    containerRef.value.clientWidth / containerRef.value.clientHeight,
+    0.1,
+    1000
+  );
+  camera.position.set(0, 1.5, 3);
+
+  // Renderer
+  renderer = new THREE.WebGLRenderer({ antialias: true });
+  renderer.setSize(containerRef.value.clientWidth, containerRef.value.clientHeight);
+  renderer.setPixelRatio(window.devicePixelRatio);
+  renderer.shadowMap.enabled = true;
+  containerRef.value.appendChild(renderer.domElement);
+
+  // Controls
+  controls = new OrbitControls(camera, renderer.domElement);
+  controls.enableDamping = true;
+  controls.dampingFactor = 0.05;
+  controls.autoRotate = true;
+  controls.autoRotateSpeed = 2;
+
+  // Lights
+  const ambientLight = new THREE.AmbientLight(0xffffff, 0.6);
+  scene.add(ambientLight);
+
+  const directionalLight = new THREE.DirectionalLight(0xffffff, 1);
+  directionalLight.position.set(5, 5, 5);
+  directionalLight.castShadow = true;
+  scene.add(directionalLight);
+
+  const directionalLight2 = new THREE.DirectionalLight(0xffffff, 0.5);
+  directionalLight2.position.set(-5, 5, -5);
+  scene.add(directionalLight2);
+
+  // Load model
+  loadModel();
+
+  // Animation loop
+  const animate = () => {
+    animationFrameId = requestAnimationFrame(animate);
+    controls.update();
+    renderer.render(scene, camera);
+  };
+  animate();
+
+  // Handle resize
+  window.addEventListener('resize', handleResize);
+};
+
+const handleResize = () => {
+  if (!containerRef.value) return;
+  
+  camera.aspect = containerRef.value.clientWidth / containerRef.value.clientHeight;
+  camera.updateProjectionMatrix();
+  renderer.setSize(containerRef.value.clientWidth, containerRef.value.clientHeight);
+};
+
+const loadModel = () => {
+  const loader = new GLTFLoader();
+  
+  loader.load(
+    props.modelPath,
+    (gltf) => {
+      model = gltf.scene;
+      
+      // Find the mesh that should receive the texture
+      model.traverse((child) => {
+        if ((child as THREE.Mesh).isMesh) {
+          const mesh = child as THREE.Mesh;
+          
+          // Create a material for the jersey surface
+          jerseyMaterial = new THREE.MeshStandardMaterial({
+            color: 0xffffff,
+            roughness: 0.7,
+            metalness: 0.1,
+          });
+          
+          mesh.material = jerseyMaterial;
+          mesh.castShadow = true;
+          mesh.receiveShadow = true;
+          
+          // Apply initial texture if provided
+          if (props.canvasTexture) {
+            updateTexture(props.canvasTexture);
+          }
+        }
+      });
+      
+      scene.add(model);
+      
+      // Center and scale model
+      const box = new THREE.Box3().setFromObject(model);
+      const center = box.getCenter(new THREE.Vector3());
+      model.position.sub(center);
+      
+      const size = box.getSize(new THREE.Vector3());
+      const maxDim = Math.max(size.x, size.y, size.z);
+      const scale = 2 / maxDim;
+      model.scale.multiplyScalar(scale);
+    },
+    undefined,
+    (error) => {
+      console.error('Error loading model:', error);
+    }
+  );
+};
+
+const updateTexture = (canvas: HTMLCanvasElement) => {
+  if (!jerseyMaterial) return;
+  
+  // Create texture from canvas
+  const texture = new THREE.CanvasTexture(canvas);
+  texture.needsUpdate = true;
+  texture.colorSpace = THREE.SRGBColorSpace;
+  
+  // Apply texture to material
+  jerseyMaterial.map = texture;
+  jerseyMaterial.needsUpdate = true;
+};
+
+// Watch for texture updates
+watch(() => props.canvasTexture, (newCanvas) => {
+  if (newCanvas) {
+    updateTexture(newCanvas);
+  }
+});
+
+onMounted(() => {
+  setupScene();
+});
+
+onBeforeUnmount(() => {
+  if (animationFrameId) {
+    cancelAnimationFrame(animationFrameId);
+  }
+  window.removeEventListener('resize', handleResize);
+  renderer?.dispose();
+  controls?.dispose();
+});
+</script>
+
+<template>
+  <div ref="containerRef" class="w-full h-full rounded-lg overflow-hidden"></div>
+</template>

app/pages/designer.vue

@@ -3,6 +3,7 @@ import DesignerCanvas from "~/components/designer/DesignerCanvas.vue";
 import DesignerPreview from "~/components/designer/DesignerPreview.vue";
 import DesignerToolbar from "~/components/designer/DesignerToolbar.vue";
 import TemplatePicker from "~/components/designer/TemplatePicker.vue";
+import ThreeDPreview from "~/components/designer/ThreeDPreview.vue";
 
 import { useSlipmatDesigner } from "~/composables/useSlipmatDesigner";
 import type { ExportedDesign } from "~/composables/useSlipmatDesigner";
@@ -40,14 +41,21 @@ const {
   zoomIn,
   zoomOut,
   resetZoom,
+  getCanvasElement,
 } = useSlipmatDesigner();
 
 // Active view selector for multi-canvas design
 const activeView = ref<"front" | "top" | "left" | "right">("front");
+const canvasElement = ref<HTMLCanvasElement | null>(null);
 
 const setActiveView = (view: "front" | "top" | "left" | "right") => {
   activeView.value = view;
   setActiveCanvas(view);
+  updateCanvasElement();
+};
+
+const updateCanvasElement = () => {
+  canvasElement.value = getCanvasElement();
 };
 
 const DESIGN_PRICE_USD = 39.99;
@@ -257,8 +265,17 @@ watch(
   { immediate: true }
 );
 
+// Update canvas element reference when canvas changes
+watch(
+  () => getCanvasElement(),
+  (newCanvas) => {
+    canvasElement.value = newCanvas;
+  }
+);
+
 onMounted(() => {
   initAuth();
+  updateCanvasElement();
 });
 
 const handleTemplateSelect = (templateId: string) => {
@@ -507,8 +524,23 @@ const handleCheckout = async () => {
               </p>
             </div>
           </div>
+
+          <!-- 3D Preview Section -->
+          <div class="rounded-3xl border border-slate-200 bg-white shadow-xl p-6">
+            <h3 class="mb-4 text-lg font-bold text-slate-900">3D Preview</h3>
+            <div class="aspect-square w-full rounded-lg overflow-hidden bg-gradient-to-br from-slate-700 to-slate-900">
+              <ThreeDPreview
+                model-path="/LAMESA.glb"
+                :canvas-texture="canvasElement"
+                @mounted="updateCanvasElement"
+              />
+            </div>
+            <p class="mt-4 text-sm text-slate-600">
+              Your design will appear on the 3D model in real-time. Rotate to view from different angles.
+            </p>
+          </div>
         </div>
-        
+
         <DesignerPreview
           :is-checkout-pending="isCheckoutPending"
           :checkout-price="DESIGN_PRICE_USD"

app/pages/index.vue

@@ -120,7 +120,7 @@ onMounted(() => {
                 class="flex h-full w-full items-center justify-center rounded-2xl border-2 border-slate-300 bg-linear-to-br from-slate-700 to-slate-900 shadow-xl overflow-hidden"
               >
                 <model-viewer
-                  src="/LAMESA.glb"
+                  src="/LAMESA-2.glb"
                   alt="Table with Jersey"
                   auto-rotate
                   rotation-per-second="15deg"

composables/useSlipmatDesigner.ts

@@ -872,6 +872,7 @@ export const useSlipmatDesigner = () => {
     refreshPreview,
     schedulePreviewRefresh,
     applyTemplateToCanvas,
+    getCanvasElement: () => canvas.value?.lowerCanvasEl || null,
   };
 };