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Hi all, i’ve been watching a breakdown about Percy Jackson visual fx, and there are some things i don’t get to understand. In the video we can see how they put blue pants to the actors and after that remove the blue color and add the 3d model, but i think about the background behind that actor, cause if we remove the blue color we remove the background as well….. anyone knows how they do that??
Thanks.
The video here: https://www.youtube.com/watch?v=8rF6Xj2LppQ
In most cases they would completely paint out the legs rather than trying to use the blue to key. You would use all the same techniques that you would use for any rig-removal shot.
For any shots like this you have to rebuild the background. If it is just environment behind the actor it is relatively easy. You can create clean patches of the background and track them over the legs, usually using a projection setup.
If there things that move behind the actor (like other actors) it can be much harder. You would have to create patches of these object from other frames and then animate them in to match the movement.
Many of you have seen the movie Once behind the scenes will feel very simple
I am also very curious about this point, the audience seemed feel very magical, in fact, do not feel particularly when stand in the shooting scene.
First off, Do you need to learn how to light and do FX work? I understand a more generalist approach is good, but are these other fields just an absolute necessary for this line of work?
For the chroma removal part, they mask out certain area and apply the Keying Effect.
What the VFX Supervisor would usually do on set is shoot a clean plate image of the scene from a similar camera angle or the Guys back in the studio would make a clean plate (Photoshop Work). Now this clean plate is set with the track data from the camera to move in the similar way and you already have your Background back. Then the 3D Model is put over it with Animations.
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