I've seen people use cloth to do this... I wouldn't recommend it. There's also this free script: http://www.scriptspot.com/3ds-max/scripts/max-retopo Or, a commercial script: http://www.matt-clark.co.uk/wrapit/spe.php?o=177 Or... if you're using 2012, I'm pretty sure it comes with some cool new features that will do this.…
Max retopo is a great little script, version 2.0 should be coming out soon. Wrapit is another amazing script with even more awesome features but it costs 30 bucks. I have wrapit love it I wouldn't retopo in max without it. A great stand alone app is topogun, quite a few people use it and swear by it, personally I found it…