diff --git a/Tools/ModelTranslator/bl_decimate.py b/Tools/ModelTranslator/bl_decimate.py
index d0f0fc69..f56183bf 100644
--- a/Tools/ModelTranslator/bl_decimate.py
+++ b/Tools/ModelTranslator/bl_decimate.py
@@ -116,6 +116,8 @@ 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
+SEAM_ANGLE_SWEEP = (55.0, 45.0, 35.0)   # 首选 66° 不过门时依次下探的 seam 角度
+STRETCH_ITERS = 30                       # minimize_stretch 松弛迭代次数
 
 
 def _clear_uv_layers(mesh):
@@ -135,18 +137,22 @@ def _unwrap_smart(obj):
     bpy.ops.object.mode_set(mode='OBJECT')
 
 
-def _unwrap_seam(obj, warnings):
-    """锐边标 seam -> MINIMUM_STRETCH/ANGLE_BASED 展开 -> pack。碎岛远少于投影式。"""
+def _unwrap_seam(obj, warnings, seam_angle_deg=SEAM_ANGLE_DEG):
+    """锐边标 seam -> MINIMUM_STRETCH/ANGLE_BASED 展开 -> 松弛 -> 纹素均衡 -> pack。
+    seam_angle_deg 可变以支持角度扫描；重跑前清掉上一档残留 seam。"""
     import bpy
     import math
     _clear_uv_layers(obj.data)
     obj.data.uv_layers.new()
     bpy.context.view_layer.objects.active = obj
     bpy.ops.object.mode_set(mode='EDIT')
-    # 锐边标 seam：接缝只落在硬边处，平滑区域保持整岛
     bpy.ops.mesh.select_mode(type='EDGE')
+    # 清掉上一档角度残留 seam（同一对象多角度扫描时必须）
+    bpy.ops.mesh.select_all(action='SELECT')
+    bpy.ops.mesh.mark_seam(clear=True)
+    # 锐边标 seam：接缝只落在硬边处，平滑区域保持整岛
     bpy.ops.mesh.select_all(action='DESELECT')
-    bpy.ops.mesh.edges_select_sharp(sharpness=math.radians(SEAM_ANGLE_DEG))
+    bpy.ops.mesh.edges_select_sharp(sharpness=math.radians(seam_angle_deg))
     bpy.ops.mesh.mark_seam(clear=False)
     bpy.ops.mesh.select_all(action='SELECT')
     try:
@@ -154,6 +160,14 @@ def _unwrap_seam(obj, warnings):
     except TypeError:  # 老版本无 SLIM 枚举
         warnings.append("MINIMUM_STRETCH 不可用，展开改用 ANGLE_BASED")
         bpy.ops.uv.unwrap(method='ANGLE_BASED', margin=PACK_MARGIN)
+    try:  # 角度松弛：压翻转/拉伸
+        bpy.ops.uv.minimize_stretch(iterations=STRETCH_ITERS)
+    except (RuntimeError, TypeError) as e:
+        warnings.append("minimize_stretch 不可用（%s），跳过松弛" % e)
+    try:  # 统一纹素密度，避免大岛霸占分辨率
+        bpy.ops.uv.average_islands_scale()
+    except RuntimeError as e:
+        warnings.append("average_islands_scale 不可用（%s），跳过纹素均衡" % e)
     try:
         bpy.ops.uv.pack_islands(rotate=True, margin=PACK_MARGIN)
     except RuntimeError:  # headless 上下文不满足时靠 unwrap 自带打包