Green Screen and Virtual Sets

 For the interior of the ship, I needed to create a virtual set, and then using Green Screen, place my actors there virtually through the Keylight tool in after effects.

The Space Ship interior was a small section that I modelled in Maya. I used a dim directional light to give the scene the correct level of lighting.

The pictures above show the actors in front of the green screen, and after the screen has been keyed out and replaced with the virtual set. Unfortunately, the actors occasionally went off the green screen or overlapped with the tracking markers that could not be keyed out, this was fixed using a mask.

The green screen was keyed using a tool in After Effects called Keylight. This allows us to take the green segments of the footage and mask them out, as well as preventing slight green reflections on the actors being keyed out as well. There are also options that allow for the actors to mesh with the backplate much more naturally.

Unfortunately, there may be sections of the green screen do not key out correctly, or the actors may step off the green slighty. this can be fixed using a mask known as a Junk Matte. A Junk Matte is like a barrier you draw around the actors, anything outside of this barrier cannot be seen. However, when the actor on the footage moves, the mask needs to be animated to prevent the actor  stepping outside of the mask.