ModelTranslator: expose --reducer CLI option

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

Tools/ModelTranslator/model_decimate.py

@@ -14,6 +14,8 @@ 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("--reducer", choices=("collapse", "quad"), default="collapse",
+                    help="减面后端：collapse=Decimate 塌陷（默认），quad=Quad Remesher 四边重拓扑（失败自动回退 collapse）")
     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)
@@ -30,10 +32,12 @@ def main():
 
     s = run_blender_script(blender, "bl_decimate.py",
                            [args.input, out_fbx, str(args.tris), args.unwrap,
-                            "" if args.max_overlap is None else str(args.max_overlap)])
+                            "" if args.max_overlap is None else str(args.max_overlap),
+                            args.reducer])
 
     print("== %s: %d -> %d 面（目标 %d）-> %s" %
           (s["src"], s["tris_before"], s["tris_after"], s["target"], out_fbx))
+    print("  后端: %s" % s.get("reducer", "collapse"))
     u = s["uv"]
     overlap = "%.1f%%" % (u["overlap"] * 100) if u["overlap"] is not None else "n/a"
     print("  UV: 模式=%s 岛数=%d 利用率=%.1f%% 翻转=%.1f%% 重叠=%s" %