69 lines
3.5 KiB
Python
69 lines
3.5 KiB
Python
"""FBX 减面 CLI：减到指定三角面数并重展 UV（seam 展开 + UVPM4 排布），输出 <名>_low.fbx。
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用法：python model_decimate.py src/well1500.fbx --tris 5000 [-o dir]
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[--unwrap seam|smart] [--reducer collapse|quad] [--max-overlap 0.15] [--blender exe]"""
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import argparse
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import os
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from mt_run import find_blender, run_blender_script
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from qr_bridge import QR_INPUT_CAP
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def main():
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ap = argparse.ArgumentParser(description=__doc__)
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ap.add_argument("input", help="FBX 文件")
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ap.add_argument("--tris", type=int, required=True, help="目标三角面数")
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ap.add_argument("-o", "--out", default=None, help="输出目录（默认源文件同目录）")
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ap.add_argument("--unwrap", choices=("seam", "smart"), default="seam",
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help="UV 展开：seam=锐边接缝整岛展开（默认），smart=Smart UV Project")
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ap.add_argument("--reducer", choices=("collapse", "quad"), default="quad",
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help="减面后端：quad=Quad Remesher 四边重拓扑（默认，失败自动回退 collapse），collapse=Decimate 塌陷")
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ap.add_argument("--qr-input-cap", type=int, default=QR_INPUT_CAP,
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help="quad 后端 QR 前预 collapse 的中等密度目标面数（默认 50000）；高密度模型直接 QR 会破洞")
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ap.add_argument("--max-overlap", type=float, default=None,
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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")
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ap.add_argument("--blender", default=None)
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args = ap.parse_args()
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if args.tris <= 0:
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ap.error("--tris 必须为正整数")
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if args.max_overlap is not None and not (0.0 < args.max_overlap <= 1.0):
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ap.error("--max-overlap 必须在 (0, 1] 内")
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if args.qr_input_cap <= 0:
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ap.error("--qr-input-cap 必须为正整数")
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blender = find_blender(args.blender)
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name = os.path.splitext(os.path.basename(args.input))[0]
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outdir = args.out or os.path.dirname(os.path.abspath(args.input))
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out_fbx = os.path.join(outdir, name + "_low.fbx")
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s = run_blender_script(blender, "bl_decimate.py",
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[args.input, out_fbx, str(args.tris), args.unwrap,
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"" if args.max_overlap is None else str(args.max_overlap),
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args.reducer, str(args.qr_input_cap)])
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print("== %s: %d -> %d 面（目标 %d）-> %s" %
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(s["src"], s["tris_before"], s["tris_after"], s["target"], out_fbx))
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print(" 后端: %s" % s.get("reducer", "collapse"))
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u = s["uv"]
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overlap = "%.1f%%" % (u["overlap"] * 100) if u["overlap"] is not None else "n/a"
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print(" UV: 模式=%s 岛数=%d 利用率=%.1f%% 翻转=%.1f%% 重叠=%s" %
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(u["mode"], u["islands"], u["fill"] * 100, u["flipped"] * 100, overlap))
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if s.get("uv_polys"):
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try:
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import json as _json
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from uv_preview import render_uv_png
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with open(s["uv_polys"], encoding="utf-8") as fp:
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polys = _json.load(fp)
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render_uv_png(polys, s["uv_preview"])
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print(" UV 观察图: %s" % s["uv_preview"])
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except Exception as e:
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print(" [警告] UV 观察图渲染失败：%s" % e)
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finally: # sidecar 是内部临时文件，无论渲染成败都清掉
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if os.path.exists(s["uv_polys"]):
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os.remove(s["uv_polys"])
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for w in s["warnings"]:
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print(" [警告] %s" % w)
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if __name__ == "__main__":
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main()
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