Hollywood sometimes finds close-ups difficult to do during dangerous stunt scenes because the person carrying out the stunt is not the film star but a stunt man.

Digital CGI has gone a long way to creating believable images of characters but still finds difficulty replicating the complexities of the human face. Marc Istook finds out how accurate digital copies can be.

For more clips and features go to the Click website. UK viewers can watch the whole programme on BBC iPlayer.