04a Tracking Tips - Multiple Shapes [Mocha Essentials]

As shots get more complicated, we need to approach them from different angles. This section looks at useful methods to get workable tracking data from tougher shots.
Reflections and lighting changes are never easy. We analyze potential issues before tracking, and explore different techniques to get the best track. We compare and contrast the various approaches shown and choose the one with the best outcome.
You will be more aware of how Mocha's tracker thinks at the end of this tutorial, and be able to better decide how to track your own footage.
Chapter List
00:00 Start
01:00 Analyzing potential problems
03:36 Multiple co-planar shapes for a better track
07:00 Experimenting with smaller shapes
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#borisfx #mocha #motiontracking

[@slavaukraini8886]

Thank you so much for this course! It helps me a lot in understanding Mocha and making more accurate tracking in it.

[@borisfxlearn]

That's great to hear! Thanks for the positive feedback and I hope you enjoy the rest of the course.

[@bishalgurung5093]

walaaaa!!!!! tx for making this

[@borisfxlearn]

And thank you for watching and leaving a comment.

[@ronydey2696]

Great tutorial sir these is really a much helpful hi myself Rony an VFX student from India

[@borisfxlearn]

That's great. Thanks, Rony.

[@rahuldeshpande3516]

Hello - great tutorials and I have learned a lot! Question, why did the reflections not affect the small 2 surfaces of the phone you used for tracking?

[@borisfxlearn]

Often smaller changes (or in this case changes in smaller areas) are ignored by the tracker as their movement is inconsistent with the overall movement of the track. That is one of the powerful reasons to use multiple shapes in these instances.

[@rahuldeshpande3516]

@@borisfxlearn perfect very helpful thank you!

[@kazerani1364]

Hi there, thanks for your useful videos. In my video, there is a computer in the background with no green screen, and I want to replace the screen. Still, the most difficult part where I struggle is when an object in the middle of the shot blocks the monitor screen for a few seconds while the camera is panning from left to right. What is the best video to watch it? thank you

[@borisfxlearn]

Take a look at the AdjustTrack videos, or if you have Mocha Pro 2024, then you can try out the Extrapolate Track option. AdjustTrack : kzbin.info/www/bejne/fmivYpejmKuraLM Extrapolate Track : kzbin.info/www/bejne/pnTGpGWCptiKfNEsi=wPvP9KmzBsfQohNA&t=162

[@kazerani1364]

@@borisfxlearn thank you but this is not a right video for what I have explained above ☝️

[@borisfxlearn]

Track Mattes and Extrapolate Tracks are the topics you are interested in. If the object completely covers the area that's being track then you cannot use Track Mattes and will have to use AdjustTrack and/or Extrapolate Track. As you can tell, KZbin comments are not the right place to handle this shot. We have a Support ticket system that will be more useful for you : support.borisfx.com/hc/en-us/requests/new?ticket_form_id=8862260885901

[@YoutubeGirlBot]

Look like you're almost stitching the object locations together? But what if you're doing a shiny dashboard with a highly reflected monitor and the driver camera is planning back and forth from the steering wheel to the car monitor (the screen sitting in the middle of the dashboard)? The shot even has a few seconds of an angle distorted fisheye look to the monitor when panning back from the steering wheel. The biggest problem is the shot is a close-up of the steering wheel and then back to the car's shiny dashboard monitor. So yes part of the right side of the steering wheel camera pan does block the monitor screen and yes the monitor does leave from the camera view. We're trying to replace the monitor car computer screen.

[@borisfxlearn]

This absolutely sounds like a tricky shot. Here are a couple of hints: 1) "distorted fisheye look to the monitor". Undistort this shot before trying to track it. You will thank me later. Use the Mocha Pro Lens module to make it easier to work and visualize what the Surface is doing. If you don't have Mocha Pro, use another optics compensation workflow prior to tracking, but don't try to do a planar track on warped footage. It won't be fun. 2) Don't try to do too much at once. If the screen moves out of view, break the clip up into two parts. No-one will know apart from you., 3) Track mattes and occlusion layers are your friends. Use track mattes to make sure the steering wheel isn't affecting the screen track. Use them for reflections too. Ex04b talks about track mattes. 4) There may be parts that you can't track. Don't worry. Track the bits you can, and use AdjustTrack to get the rest into place. 5) This bit is so important, I'm saying it twice. Undistort this shot before you try to track it! Good luck with the project. Don't forget to hit us up on the forums too : forum.borisfx.com/