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# 5 01-04-2011 , 09:33 AM
LauriePriest's Avatar
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Tricky shot to track for sure, but remember since its close up it will be relatively forgiving on the BG since there won't be much frame of reference for the join betwee the plate and the CG so you can get away with quite alot.

Boujou is nice but not super powerful at tweaking so you have to give it quite alot to work with.

Take some survey and put some paralax stands between the actor and the wall to help get the motion right.
If you have a low depth of field it will be much easier using LEDs or bigger contrasty spherical shapes to do the tracking since corners and right angles will get blurry less steady.

If you have a spare camera shoot a static witness camera of the action and you can use that in maya to correct the main camera motion when it goes wrong. e.g. if a paralax stand goes out of shot .. your height and angle is going to slip majorly but you can shift it back into place in maya, make use of animation layers.

If you dont have any major massive turns and not enough screen space for useful paralax stands it might be easier to do a nodal track for bits of it, but really depends on the footage. Feel free to post a few movs of the footage after you've shot it and ill give you some tips.

Take a shit load of photographs of the set, and two - three witness cameras would be ideal. even a compact camera wich can go as wide as possible would help out. Just need to align them to you 3D set (model the shooting enviroment in 3D).

This kinda photography is a bit of a match move nightmare, isn't really a quick fix if you have room to get paralax do what you can! If the actors arn't moving much dont be affraid to track them either, if it will put your camera in the right place in space its better than nothing.

Also consider shooting a bit wider than you want for the final shot (10-15% extra each side) so you have more room for markers etc and then push in afterward.. or even shoot really wide and then distort and push in. Depends what your shooting on / if you can afford that much resolution loss. .. Could always strap another camera onto your main one with a wide angle lens (one of those cameras they use for sports would be fine) then just track that and parent your main camera to that in maya.

Hope thats useful


FX supervisor - double negative