motion tracking

[Brothelowner]

There used to be an adobe tutorial explaining this.

For starters you should go to the point when the object comes back onto the screen and manually put the track point where you want it.
If the motion of the taxi is linear, you should almost have a good track.

The proper way or the 2nd step is:
In the couple of frames before the top of the taxi goes off screen, you need to move the “Search region” and “Feature region” (the 2 little boxes) but not the “Attach point”.

Basically just ALT+Click inside the larger box and outside the smaller box and drag it to another part of the taxi that remains on the screen.(Try a door handle maybe.)

Once the taxi roof returns to the frame you can ALT+Click and then drag back the the original feature.

You should have tracked a different part of the car but at the same time left the attach point where it originally was.

I hope this makes sense.

BrothelOwner

[Joe Chao]

I’m afraid that it’s impossible to track something out of the screen.But maybe you can track the object which is in the screen and keeps still comparing to the object you want to track.For example since the advertise is going out of the screen, maybe you can track the cab,especially the back part of te cab(it could be still in the screen when the advertise had gone out).Then you will be able to get the motion datas of the advertise.wish to be helpful.You can achieve it by adjusting the position of sttach point and it’s off set .

[Arthur Vibert]

I did a search in AE for “tracking off screen” and came up with something that might be helpful titled “multiple motion tracking points” that was posted Nov 1.

Might have the info you need.

Arthur Vibert

[The Gare]

I know this is a few dyas old, but I remember watching Total Training for this exact problem. There is an option to continue tracking something offscreen, but you have to do something first, like make the comp larger than the actual size of your footage. It seems to work pretty well.

I am going to be watching that section again since I need to do this also. I will post my findings later.