Prep for live action + greenscreen stop motion

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Prep for live action + greenscreen stop motion
by David Komer on Nov 2, 2012 at 8:12:07 am

I am getting ready to shoot a scene which involves a live actor with a stop-motion creature.

My main problem is that the camera will need to move freely all around the actor- and in the final composite, the stop-motion creature needs to sit correctly in the frame to match (perspective, lighting, etc.) Both the actor and the creature will be moving their arms, jumping around, and so on.

I'm open to any and all suggestions!

Ideally, the actor will be shot on-location and the stop-motion will be greenscreened, but if shooting both against greenscreen has some serious advantages- I'm (less enthusiastically) open to it ;)

Please include info about how to properly use tracking points in this setup- I'm going to do some tests before I run out for the real shoot, but I'd really like to hear some experienced perspective on this first :)

Thanks!

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Re: Prep for live action + greenscreen stop motion
by Chris Wright on Nov 2, 2012 at 11:56:44 am

i think your best bet is to use a temporary cgi stand-in.

1. motion track the actor in full 3 track, then insert a basic low res 3d cgi model into the footage. animate its motion parts to your desire.

2. Then simply match the green screened stop motion final cut exactly to the cgi model. This will then give you perfect perspective/timing in a stopmotion sequence. ie. motion over time in frames per second.

fyi.
if you need the person to interact with the object, use a real object that is a little smaller than the final stopmotion. You can still overlay with cgi and final composite. This always looks more real and helps actors interact with their environment. Also helps with lighting.

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Re: Prep for live action + greenscreen stop motion
by David Komer on Nov 2, 2012 at 12:07:34 pm

Thanks- great points :)

Can you please explain what you mean by "motion track the actor in full 3 track" ?

- is that tracking points in the BG?

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Re: Prep for live action + greenscreen stop motion
by Christian Negus on Dec 15, 2012 at 12:38:19 pm

I think what he means is the Position, Rotation and Scale.

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