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Pinning 2D shots to 3D locations in 360 degree pan shot

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Derek NightPinning 2D shots to 3D locations in 360 degree pan shot
by on May 17, 2012 at 10:31:30 pm

I'm trying to figure out how to accomplish this.

So basically:
1. I'll have a 360 degree pan shot, which I plan to loop.
2. I'll also have various green screen shot objects.
3. I want to "pin" these green screen shot objects to certain locations in the 360 degree pan shot, matching the movement/motion of the 360 degree shot, so when the 360 shot continues past the location of where the object is pinned, it's removed from the screen. Basically, just emulating if I really did that 360 shot with those object elements in a real scene, except the objects are digital.

Here's an image of the setup - all the "objects" in this case are the "green screen shot objects" I talk about above:

I guess a way of accomplishing it is, I leave the 360 pan shot as a 2D layer, behind the 3D layered "green screen objects", then do some sort of After Effects expression to handle the 3D camera rotation to synchronize its motion to the 360 pan shot. Is this the best way or am I over thinking it?

Here are my restraints:
- I'm using After Effects, but I'm open to purchasing new software if something does this very well.
- The 360 degree pan will be accomplished just by hand, then I'll do my best to time stretch and correct movement in Final Cut or After Effects to be as smooth as possible.
- I need to be able to loop the 360 camera pan seamlessly, and have those objects remain where I digitally pinned them
- I'll be synchronizing this to audio, so it needs to be relatively smooth. I guess that has more to do with my pan technique.

I'm fairly well versed with After Effects, and it seems like this would be doable. I'm just not sure the best way to go about doing it. Nothing has been shot yet. Shooting on HDV, post with After Effects.

Help me Obi Wan Kenobi, you're my only hope!

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