off2obj.py

import argparse
p = argparse.ArgumentParser(description='off to obj.')

p.add_argument('input')
p.add_argument('out')
args = p.parse_args()

with open(args.input) as f:
    lines = f.readlines()
    meta = lines[1].split()
    vn = int(meta[0])
    fn = int(meta[1])

with open(args.out, 'w') as f:
    for i in range(2, 2 + vn):
        f.write('v ' + lines[i])
    for i in range(2 + vn, 2 + vn + fn):
        face = [str(int(s)+1) for s in lines[i].split()[1:]]
        s = ' '.join(face)
        f.write('f ' + s + '\n')