diff --git a/Tools/ModelTranslator/bl_decimate.py b/Tools/ModelTranslator/bl_decimate.py
index c7831b30..592f6666 100644
--- a/Tools/ModelTranslator/bl_decimate.py
+++ b/Tools/ModelTranslator/bl_decimate.py
@@ -141,8 +141,7 @@ PACK_MARGIN = 0.002     # 岛间距 ≈ 2048 图 4px
 UVPM_EXT = "bl_ext.user_default.uvpackmaster4"   # UVPackmaster 4 扩展模块名
 UVPM_PIXEL_MARGIN = 4   # UVPM 岛间距（像素），与 PACK_MARGIN * UVPM_TEX_SIZE 同口径
 UVPM_TEX_SIZE = 2048
-UVPM_ROTATION_STEP = 15    # UVPM 旋转步进（度）；比默认 90 更细，利于薄斜条对齐
-UVPM_HEURISTIC_TIME = 10   # UVPM 启发式搜索秒数上限（默认 0=无限，必须给正值上限）
+UVPM_ROTATION_STEP = 15    # UVPM 旋转步进（度）；比默认 90 更细，利于薄斜条对齐（启发式因引擎崩溃已弃用）
 SEAM_ANGLE_SWEEP = (55.0, 45.0, 35.0)   # 首选 SEAM_ANGLE_DEG 不过门时依次下探的 seam 角度
 STRETCH_ITERS = 30                       # minimize_stretch 松弛迭代次数
 REL_WELD = 1e-4   # 焊接距离占局部包围盒对角线比例（避免 cm/m 单位差异导致绝对阈值失准）
@@ -299,7 +298,9 @@ def _uvpm_set(p, name, value, warnings):
 
 def _uvpm_repack(obj, warnings):
     """UVPM4 重排当前 UV 布局，成功返回 True；任何失败记警告返回 False，
-    保底布局（pack_islands/smart_project）原样保留。"""
+    保底布局（pack_islands/smart_project）原样保留。rotation_step 调细以利薄斜条对齐。
+    注：UVPM 启发式搜索（heuristic）在 headless 下会随机崩溃引擎进程（Engine process died），
+    确定性/稳定性差，故不启用——只用旋转增强这一稳定杠杆。"""
     global _uvpm_failed
     if _uvpm_failed:
         return False
@@ -312,8 +313,6 @@ def _uvpm_repack(obj, warnings):
         p.pixel_margin_tex_size = UVPM_TEX_SIZE
         _uvpm_set(p, "rotation_enable", True, warnings)
         _uvpm_set(p, "rotation_step", UVPM_ROTATION_STEP, warnings)
-        _uvpm_set(p, "heuristic_enable", True, warnings)
-        _uvpm_set(p, "heuristic_search_time", UVPM_HEURISTIC_TIME, warnings)
         bpy.context.scene.tool_settings.use_uv_select_sync = True
         bpy.context.view_layer.objects.active = obj
         bpy.ops.object.mode_set(mode='EDIT')