Im making a web launch video and would liked to use similar techniques, especially with the web pages tracking the buildings in city shots.
I have tried to use mocha to track the side of a building, but its not proving ideal. Obviously the motion tracker inside AE won't give me the depth/perspective.
I don't have Synth eyes or the Foundry's Camera tracker and it will take a while to get admin permissions to install it at work.
I thought camera trackers were for integrating and building 3D objects..?
So what's the best way to do this? I have also tried to keyframe it manually but its not looking too flash so far!
Re: Mocha, or Camera Tracker? by ben g unguren on Sep 8, 2011 at 8:14:49 pm
The general rule of thumb is that Mocha works great if your graphics are ATTACHED to an EXISTING surface (like a logo on the side of a building, or changing the words on a sign). If you're trying to add something in 3D space (like graphics that "hover" around the building, and seem to actually be there), then you need a 3D solution.
Mocha and AE's internal trackers give you 2D solutions. Mocha's solutions are a bit more sophisticated, producing corner-point information that mimics 3D, but [this is key] it doesn't produce a 3D camera.
Syntheyes and similar apps will give you an animated 3D camera as well as target points that simulate the world you're tracking (target points for the ground, buildings, etc -- whatever you've managed to track and can get a 3D "solution" for). This is A LOT more information than what Mocha or AE's internal tracking can get you.
One other point: when the camera is only panning and tilting (not actually changing it's own position) then a 2D solution can (sort of) mimick a 3D camera solution. So if all you're doing is panning and tilting, then you could track that in Mocha, then use that data to animate objects (that are given perspective, for instance). You would be able to achieve a lot of the graphics in the video you linked to using that technique, as they're using a lot of static cameras.
I agree with Ben. In most of the shots from your example Mocha can be used. I suspect that some of those shots where not really video files, but still images cleverly transformed in a 2.5d comp where camera moves can be animated in AE - so no tracker there.
Here's a good tutorial for what Mocha can do: http://www.videocopilot.net/tutorials/magic_tracking/