Hey,
contrary to what other people are saying, the built in camera tracker is pretty good - probably half of all 3D tracking I'm already doing inside AE and not only for compositing, we're actually outputting the camera to 3D packages so thumbs up for that.
The only thing that is painfully missing is the ability to help the tracker with manual tracks.
There are moments when the autotracker just can't find enough tracking markers in a frame to get a solid 3D solve.
In these case in other software we track some manual trackers and tell the solver to use these.
Also all manual trackers have a higher trust value from the solvers than automatic trackers, so whenever a secene is busy and there are a lot of random trackers - if the solver gets a couple of manual tracker it knows that they are the ones showing the real motion and that it can disregard the autotrackers that move compeltely different.
From a UI perspective I think there's no point overcomlicating this - add a layer selector and tell the Camera tracker to use all Track Points from that layer as manual trackers for camera solving.
Maybe even just use trackers from the current layer, but I'm not sure how stable it would be to have normal AE trackers and the 3D Camera tracker all on one layer.
For bonus points - figure out a way of using Mocha tracks - they are 2D, but they do contain Pos, Rot and Scale which should be an additional help to the solver I imagine.
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