diff --git a/Tools/ModelTranslator/model_decimate.py b/Tools/ModelTranslator/model_decimate.py
index f38b0596..7703db77 100644
--- a/Tools/ModelTranslator/model_decimate.py
+++ b/Tools/ModelTranslator/model_decimate.py
@@ -31,11 +31,14 @@ def main():
         s = run_blender_script(blender, "bl_decimate.py",
                                [args.input, out_fbx, str(args.tris), "none"])
         warnings = list(s["warnings"])
+        # 惰性导入：seam/smart 路径不依赖 rizom 模块
         from rizom_unwrap import RizomError, find_rizomuv, rizom_unwrap
         try:
             rizom_unwrap(out_fbx, find_rizomuv(args.rizom))
         except RizomError as e:
             warnings.append("RizomUV 不可用：%s" % e)
+        except Exception as e:   # 意外异常也不中断管线：记警告，交 bl_uvgate 回退 seam
+            warnings.append("RizomUV 异常：%r" % e)
         g = run_blender_script(blender, "bl_uvgate.py", [out_fbx, "rizom"])
         s["uv"] = g["uv"]
         s["warnings"] = warnings + g["warnings"]
diff --git a/Tools/ModelTranslator/rizom_unwrap.py b/Tools/ModelTranslator/rizom_unwrap.py
index 1a4b694a..9bcbef0f 100644
--- a/Tools/ModelTranslator/rizom_unwrap.py
+++ b/Tools/ModelTranslator/rizom_unwrap.py
@@ -16,7 +16,7 @@ class RizomError(Exception):
 
 
 def candidate_paths(cli_arg=None, env_val=None, reg_val=None, default=DEFAULT_RIZOM):
-    """rizomuv.exe 候选路径，优先级：CLI 参数 > 环境变量 > 注册表 > 默认安装位置。"""
+    """rizomuv.exe 自动发现候选：环境变量 > 注册表 > 默认安装位置（显式 CLI 路径走独占分支不进此链）。"""
     return [p for p in (cli_arg, env_val, reg_val, default) if p]
 
 
@@ -115,7 +115,7 @@ def rizom_unwrap(fbx_path, exe, map_res=MAP_RES, padding_px=PADDING_PX):
     last = None
     for attempt in range(1 + RETRY):
         if attempt:
-            print("[警告] RizomUV 第 %d 次失败（%s），换新实例重试" % (attempt, last))
+            print("[警告] RizomUV 第 %d 次失败，换新实例重试" % attempt)
         try:
             return _unwrap_once(mod, exe, fbx_abs, map_res, pad_uv)
         except RizomError as e:
@@ -124,7 +124,10 @@ def rizom_unwrap(fbx_path, exe, map_res=MAP_RES, padding_px=PADDING_PX):
 
 
 def _unwrap_once(mod, exe, fbx_abs, map_res, pad_uv):
-    link = mod.CRizomUVLink()
+    try:
+        link = mod.CRizomUVLink()
+    except Exception as e:   # 构造失败也归一为 RizomError，维持"失败只抛 RizomError"契约
+        raise RizomError("RizomUVLink 实例创建失败：%s" % e)
     try:
         _call("RunRizomUV", lambda _p: link.RunRizomUV(exePath=exe), None, timeout=60)
     except RizomError as e: