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  • Global cornerpin effect on top of a mocha cornerpin track?

  • Scott Clements

    June 19, 2022 at 9:23 pm

    Hi, I am trying to comp a .psd of a thin rectangular picture into an HD shot of a mobile phone. I did a cornerpin track of the phone in mocha, but I couldn’t really track the corners where they should go on the final shot – though I roughly got the tracking data for most of the shot. I want to use this data, but I then want to apply an overall cornerpin effect to the thin rectangle and make any needed adjustments. How do I do this, while having the corners align with the actual borders of the thin rectangle? The only way I would know how to apply an overall cornerpin to a cornerpin track would be to precomp the mocha tacked shot and apply the cornerpin effect to the precomp – but the problem with this is that it makes it so that the corners of the new cornerpin are the 4 corners of the full resolution of the shot – not the 4 corners of the thin rectangle I want to comp. I really need manual control over the 4 corners of the thin rectangle, as I need to do some fine adjustments and it’s too hard to control using the four corners of the full resolution. I am not a terribly advanced After Effects User, so there are probably all sorts of workarounds I am not aware of. Does anyone have any advice for the best way to do this? Thanks.

  • Filip Vandueren

    June 20, 2022 at 12:30 pm

    Remember that the track and the resulting cornerpin are not the same thing. You can track a portion of a surface while the actual corners of the output track are elsewhere.

    So I would try to manipulate the corners inside of mocha AE

  • Scott Clements

    June 20, 2022 at 2:07 pm

    Unfortunately, I don’t really know what you mean by this. All I know how to do is track the object in Mocha and export the cornerpin data. I don’t know if you mean that I can bring the .psd file into Mocha and make it line up there? Sorry, I am so not an expert in any of this.

  • Filip Vandueren

    June 20, 2022 at 2:36 pm

    Hi Scott, I mean that the corner pin doesn’t have to be exactly the shape that was tracked.

    So for example you can track a circle on a screen, then adjust the corners of the cornerpin to encompass the whole screen, not just the shape of the track.

    It’s covered in most basic Mocha tutorials but it’s unintuitive.

    For example here, starting at 6minutes:

    https://youtu.be/GoUpnqgCrUg

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  • Scott Clements

    June 22, 2022 at 9:20 am

    Thanks, Filip!

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