ModelTranslator: harden QR fallback (cleanup-in-try, wait after kill, keep engine error)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Tools/ModelTranslator/bl_decimate.py

@@ -126,7 +126,7 @@ def _remesh_quad(obj, target_tris, warnings):
     import time
     engine = qr_bridge.find_qr_engine()
     if not engine:
-        warnings.append("未找到 QuadRemesher 引擎(xremesh.exe)，回退 collapse")
+        warnings.append("未找到 QuadRemesher 引擎（xremesh.exe），回退 collapse")
         return False
     work = os.path.join(tempfile.gettempdir(), "mt_qr")
     os.makedirs(work, exist_ok=True)
@@ -134,10 +134,10 @@ def _remesh_quad(obj, target_tris, warnings):
     out_fbx = os.path.join(work, "retopo.fbx").replace("\\", "/")
     prog = os.path.join(work, "progress.txt").replace("\\", "/")
     settings = os.path.join(work, "RetopoSettings.txt")
-    for f in (out_fbx, prog):
-        if os.path.isfile(f):
-            os.remove(f)
     try:
+        for f in (out_fbx, prog):
+            if os.path.isfile(f):
+                os.remove(f)
         bpy.ops.object.select_all(action='DESELECT')
         obj.select_set(True)
         bpy.context.view_layer.objects.active = obj
@@ -147,7 +147,7 @@ def _remesh_quad(obj, target_tris, warnings):
             fp.write(qr_bridge.build_settings(in_fbx, out_fbx, prog, target_quads))
         proc = subprocess.Popen([engine, "-s", settings])
     except Exception as e:
-        warnings.append("QR 启动失败(%s)，回退 collapse" % e)
+        warnings.append("QR 启动失败（%s），回退 collapse" % e)
         return False
 
     t0 = time.time()
@@ -158,26 +158,27 @@ def _remesh_quad(obj, target_tris, warnings):
                 state, msg = qr_bridge.parse_progress(fp.read())
         except IOError:
             state, msg = "running", ""
-        if state == "success":
+        if state in ("success", "error"):
             break
-        if state == "error":
-            warnings.append("QR 重拓扑失败(%s)，回退 collapse" % msg)
-            return False
         if proc.poll() is not None:
             # 进程已退出：给 progress/输出一点落地时间后再判一次
             time.sleep(QR_POLL_INTERVAL)
             try:
                 with open(prog) as fp:
-                    state, _ = qr_bridge.parse_progress(fp.read())
+                    state, msg = qr_bridge.parse_progress(fp.read())
             except IOError:
-                state = "running"
+                state, msg = "running", ""
             break
         if time.time() - t0 > qr_bridge.QR_TIMEOUT:
             proc.kill()
-            warnings.append("QR 超时(%ds)，回退 collapse" % int(qr_bridge.QR_TIMEOUT))
+            proc.wait()
+            warnings.append("QR 超时（%ds），回退 collapse" % int(qr_bridge.QR_TIMEOUT))
             return False
         time.sleep(QR_POLL_INTERVAL)
 
+    if state == "error":
+        warnings.append("QR 重拓扑失败（%s），回退 collapse" % msg)
+        return False
     if state != "success" or not (
             os.path.isfile(out_fbx) and os.path.getsize(out_fbx) > 0):
         warnings.append("QR 无有效输出，回退 collapse")
@@ -192,13 +193,13 @@ def _remesh_quad(obj, target_tris, warnings):
             warnings.append("QR 导回无 mesh，回退 collapse")
             return False
         retopo = new[0]
-        bpy.data.objects.remove(obj, do_unlink=True)
         bpy.ops.object.select_all(action='DESELECT')
         retopo.select_set(True)
         bpy.context.view_layer.objects.active = retopo
+        bpy.data.objects.remove(obj, do_unlink=True)
         return True
     except Exception as e:
-        warnings.append("QR 导回失败(%s)，回退 collapse" % e)
+        warnings.append("QR 导回失败（%s），回退 collapse" % e)
         return False