posted 12-11-2000 12:29 AM
Remember that in movies you can show things that are not actually possible in real life! They love to show spies doing incredible make up jobs that would never work in the real world.A "pull-off" mask is a special effect that really won't work in the real world. The way this is usually done is to use the real actor to play the part and reach down and start to peel off a mask starting down at the neck. Next you cut to a shot of the second actor who is supposed to be the person pretending to be the first person. This actor is already in the act of removing a mask (that can resmble the other actor) that you don't get a very good look at. What Mission Impossible did was use CGI to elimate the obvious cut between shots. You still have one actor changing into another onscreen - the computer trick is to make it look like it is one actor removing a mask.
Here are some of the problems with trying to do this special effect "for real":
1) Unless the second person happens to have a smaller face that is very similar in bone structure to the first person, you aren't going to be able to make a life cast of one actor and just slip it over the second actor. Unless you painted in a very thin layer of liquid latex, a rubber cast of an actor's own face wouldn't fit him - the thickness would start distorting it!
2) You could use a lifecast of the disguised actor and sculpt an amazingly accurate copy of the first person' face over it and make a mask from a mold of that.
If you're that amazing of a sculptor that you can reproduce a person's face in that amount of detail and alter the scale and proportions unnoticeably to fit over another person's face then get out of movies! Someone that phenomenally talented can make more money, much faster outside of the movie business.
3) For any prosthetic to move properly with the skin, it has to be glued down securely. Medical adhesives of various types are usually used, and these really stick well. Very strong glue is used around areas where the edges are likely to peel up like near the mouth. A "pull off" mask is essentially a full face prosthetic, and it would have to be glued down very securely to move anything remotely like real skin. When people remove them in the movies, these magical masks peel off like they are held on with a few spots of school glue! Anyone who has watched an actor swab their face with adhesive remover and pull and stetch and curse while they try to get their false face off at the end of a day of shooting laughs when they see spies peel off their super realistic masks one handed with almost no effort.
Don't be worried - directors ask for all kinds of impossible things - the less they know about effects, the crazier their requests can be. Part of the job of FX people (including make up FX people) is to tell tham what can be done, how much it is going to cost (there are some things to do that are very hard and cost a fortune to do) and when it is simply impossible. You can create almost any effect imaginable, but the director is going to have to let you cut away one or more times during the effect, or shoot it from a certan angle or in a certain way, or use CGI to enhance what physically can't be done.
Good luck, and please tell us what you end up doing and how it goes.
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Jeff F - Moderator
Magic and FX
Amazing the Masses