Hey, I’m shooting a short film against a green screen and I am interested in using 3D environments as background replacements. I’ve seen alot of tutorials on how to ‘motion track’ 3D objects into live footage but very little on doing this the other way around.
From the little information and tutorials I have found on this, 3D studio max seems to be the tool of choice, however, I am currently using Cinema 4D…
Could anyone point me in the direction?
Cinema 4d does not track motion. But it’s easy
to make a plane textured with your footage and
alpha channel from a black-white clip of your
keyed footage( like the actors are floating in
space) and make this child of a 3d object lying
in the desired depth. It’s anorthodox and some
compositors maybe mock me for this but if you
don’t have much rotation it will work. If not
export your 3d scene video to Nuke or AE or
whatever, stabilize and overlay your keyed
footage.
its the same workflow: you need to matchmove your camera to get a cg camera. after that create your 3d scene and render it with the matchmove camera. so the movement of the cg background matches the movement of the foreground.
it doesnt matter which 3d package you use.
for c4d there is a plugin for basic matchmoving called cinecat
or you use any other software to matchmove (syntheyes, boujou, pftrack) or you look for a new build of blender which has comes from the “tomato” branch, this has also basic matchmove features
The tracking of greenscreen footage can succed
only under specific circumstances ( pre-put markers
maybe ). If so go for pingking’s suggestion.
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