ModelTranslator: model_decimate 新增 --max-overlap 参数（校验+透传）

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Tools/ModelTranslator/model_decimate.py

@@ -14,10 +14,14 @@ def main():
     ap.add_argument("-o", "--out", default=None, help="输出目录（默认源文件同目录）")
     ap.add_argument("--unwrap", choices=("seam", "smart"), default="seam",
                     help="UV 展开：seam=锐边接缝整岛展开（默认），smart=Smart UV Project")
+    ap.add_argument("--max-overlap", type=float, default=None,
+                    help="UV 重叠容忍上限（0-1，默认内置 0.08）；调高可让更高 seam 角度过门、减少碎岛")
     ap.add_argument("--blender", default=None)
     args = ap.parse_args()
     if args.tris <= 0:
         ap.error("--tris 必须为正整数")
+    if args.max_overlap is not None and not (0.0 < args.max_overlap <= 1.0):
+        ap.error("--max-overlap 必须在 (0, 1] 内")
 
     blender = find_blender(args.blender)
     name = os.path.splitext(os.path.basename(args.input))[0]
@@ -25,7 +29,8 @@ def main():
     out_fbx = os.path.join(outdir, name + "_low.fbx")
 
     s = run_blender_script(blender, "bl_decimate.py",
-                           [args.input, out_fbx, str(args.tris), args.unwrap])
+                           [args.input, out_fbx, str(args.tris), args.unwrap,
+                            "" if args.max_overlap is None else str(args.max_overlap)])
 
     print("== %s: %d -> %d 面（目标 %d）-> %s" %
           (s["src"], s["tris_before"], s["tris_after"], s["target"], out_fbx))