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Blood Stain on a Shirt using Mocha

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Nacera Mekki
Blood Stain on a Shirt using Mocha
on Jun 27, 2013 at 9:04:27 pm

I am having trouble trying to figure out how to put a blood stain on a shirt and keep it there!

I've been trying to track the selected motion in Mocha, but for some reason the keyframes (once I past back into AE) are not moving within the selected area.
I'm not sure if I am missing some important step, but I have followed tutorials and can't figure out what I'm doing wrong.
Is this the best way to create a blood stain on a shirt with moving footage?

The blood stain was created as a solid, then a mask on top of the shirt.
I created a null object to copy the keyframe path from Mocha, then linked (parented) the solid 'Blood' layer to the null object.

Any help or suggestions much appreciated!!
Thanks!


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Nathan Grout
Re: Blood Stain on a Shirt using Mocha
on Jun 27, 2013 at 10:28:15 pm

Where your playhead is on your After Effects timeline matters when pasting in the keyframes. It needs to be on the first frame of the clip. I've forgotten this a million times, so when I see Mocha tracking that doesn't line up, this is always the first thing I check (and it's usually the cause).


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Nacera Mekki
Re: Blood Stain on a Shirt using Mocha
on Jun 28, 2013 at 12:20:37 am

Thanks, I've tried lining up the playhead at the start of the clip. The problem is that the tracking is not staying with the area I created in Mocha. Still trying to figure this one out.
Thanks so much for your help.


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Nacera Mekki
Re: Blood Stain on a Shirt using Mocha
on Jun 29, 2013 at 8:01:27 pm

Thanks for your input!! Turns out I needed to use to different tracking points, one on each shoulder, to get the motion to stay put on his shirt.


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