import trimesh

path = "R_WRIST_R_S.STL"

obj = trimesh.load(path)

if isinstance(obj, trimesh.Scene):
    mesh = trimesh.util.concatenate(list(obj.geometry.values()))
else:
    mesh = obj

print("原始面数:", len(mesh.faces))

# 想删掉 80% 的面（保留 20%）
target_reduction = 0.8   # 0~1 之间

mesh_simplified = mesh.simplify_quadric_decimation(target_reduction)
print("简化后面数:", len(mesh_simplified.faces))

out_path = "R_WRIST_R_S_low.STL"
mesh_simplified.export(out_path)
print("已导出:", out_path)