new model viewer fix

src/server/routes/adminModels.ts

@@ -242,10 +242,15 @@ router.get('/admin/models/:id/edit', requireAdmin, (req: Request, res: Response)
   const model = q<Model>(`SELECT * FROM models WHERE id = ?`).get(req.params.id)
   if (!model) { res.redirect('/admin'); return }
 
-  const categories = q<Category>(`SELECT * FROM categories ORDER BY sort_order, name`).all()
-  const pdfs       = q<ModelPdf>(`SELECT * FROM model_pdfs WHERE model_id = ? ORDER BY sort_order`).all(model.id)
+  const categories  = q<Category>(`SELECT * FROM categories ORDER BY sort_order, name`).all()
+  const pdfs        = q<ModelPdf>(`SELECT * FROM model_pdfs WHERE model_id = ? ORDER BY sort_order`).all(model.id)
+  const absModelPath = path.join(UPLOADS_DIR, model.file_path)
+  const hasGeometry = (model.file_type === 'step' || model.file_type === 'stp')
+    ? fs.existsSync(geometryOutputPath(absModelPath))
+    : true
+
   res.render('admin/edit', {
-    model, categories, pdfs, error: null,
+    model, categories, pdfs, error: null, hasGeometry,
     baseUrl: process.env.BASE_URL ?? `http://localhost:${process.env.PORT ?? 3000}`,
   })
 })
@@ -277,6 +282,44 @@ router.post('/admin/pdfs/:id/delete', requireAdmin, (req: Request, res: Response
   res.redirect(`/admin/models/${pdf.model_id}/edit`)
 })
 
+// ---- Reconvert STEP/STP geometry -----------------------------------------
+
+router.post('/admin/models/:id/reconvert', requireAdmin, async (req: Request, res: Response) => {
+  const model = q<Model>(`SELECT * FROM models WHERE id = ?`).get(req.params.id)
+  if (!model) { res.status(404).json({ error: 'Model not found' }); return }
+
+  if (model.file_type !== 'step' && model.file_type !== 'stp') {
+    res.status(400).json({ error: 'Only STEP/STP models require geometry conversion' }); return
+  }
+
+  const absModelPath = path.join(UPLOADS_DIR, model.file_path)
+  if (!fs.existsSync(absModelPath)) {
+    res.status(404).json({ error: 'Source model file not found on disk' }); return
+  }
+
+  const geoOutPath = geometryOutputPath(absModelPath)
+
+  try {
+    await convertStepFile(absModelPath, geoOutPath)
+  } catch (err) {
+    res.status(500).json({ error: `Conversion failed: ${(err as Error).message}` }); return
+  }
+
+  // Regenerate thumbnail from new geometry (non-fatal)
+  try {
+    const geo  = JSON.parse(fs.readFileSync(geoOutPath, 'utf8')) as GeometryFile
+    const tris = geometryToTriangles(geo)
+    const thumbPath = thumbnailOutputPath(UPLOADS_DIR, model.id)
+    await renderThumbnail(tris, thumbPath)
+    const thumbRel = path.relative(UPLOADS_DIR, thumbPath).replace(/\\/g, '/')
+    db.prepare(`UPDATE models SET thumbnail_path = ? WHERE id = ?`).run(thumbRel, model.id)
+  } catch (thumbErr) {
+    console.error('[thumbnail] reconvert thumbnail failed:', (thumbErr as Error).message)
+  }
+
+  res.json({ ok: true })
+})
+
 // ---- JSON list -----------------------------------------------------------
 
 router.get('/api/admin/models', requireAdmin, (_req: Request, res: Response) => {

src/server/services/stepConverter.ts

@@ -22,7 +22,11 @@ let _init: Promise<Awaited<ReturnType<typeof occtimport>>> | null = null
 
 async function getOcct() {
   if (_occt) return _occt
-  if (!_init) _init = occtimport().then(m => { _occt = m; return m })
+  if (!_init) {
+    _init = occtimport().then(m => { _occt = m; return m })
+    // Reset on failure so the next upload attempt retries rather than replaying a cached rejection
+    _init.catch(() => { _init = null })
+  }
   return _init
 }