Tracking objects/Screenphone that leaves the frame and re-enters again?

[shehabelabnoudy]

Hi,

I have got a footage where I need screen replacement in this case I will use Mocha ae plugin in after effects

but generally i tried many ways but i couldn't track it well as the screen-phone leaves the frame and re-enters it again

There was another footage where I wanted to track green chroma but within Mocha ae but camera goes away from the frame and then back to the green screen

mobile phone

Anybody can help or show me articles to learn

Thanks

Shehab

[Rick Gerard]

Make sure perspective is turned on when you track in Mocha and do two tracks. You can track in both directions, but you cannot have a plane go completely off screen and then bring it back on in one operation. You also don't need to track every frame. There is no need for tracking data when the plane you are tracking is out of the shot.

[shehabelabnoudy]

Hi Richard,

Thanks for the information, I thought of this idea of doing 2 tracks but the problem here when the camera moves the (Show planar surface) has 4 corner pins, when the camera begin to move away and there is no more 4 corners to be tracked every thing goes wrong thats the problem here when I do not have the 4 corners to stick the into it, I hope you understand me

Thanks

Shehab

[Roland Kahlenberg · Accepted solution]

In mocha, such tracking tasks is known as Occluded Tracking and this involves tracking objects either partially of fully occluded - which includes objects that momentarily leave the scene.

https://borisfx.com/videos/mocha-tips-how-to-track-occluded-object/

With AE's Point Tracking tools/features, such tracking issues/tasks are known as Offset Tracking.