Reversing the Y coordinates

[Grant Swanson]

I’m not quite sure I know exactly what you’re trying to do, but try applying the tracking data from the text to a null object and simply place a minus sign (-) in front of the y value for either position or anchor point, depending on where your text applies it. The data will still be applied, but it will all be negative (only in the y-coordinates).

Let me know if this works for you, or if I’m misunderstanding what you’re doing.

Grant Swanson
Visual Effects Supervisor
Video Apex
videoapex.blogspot.com

[S. Marcotte]

In PFTrack, my 10-frame marker moves downward, therefore Y 10 to Y 1. PFTrack calls the bottom row of pixels Y 1.

I bring that info into AE, and my null instead moves upwards, simply because AE calls the TOP row of pixels Y 1.

I’m looking to make them match.

Off the top, your idea sounds like a good one. But how do you stick a minus sign in there? If you try to select all your keys, then click the Y parameter and type “-” before the first number, every single key after that transforms into that first number.

I’ll try posting in Expressions, as suggested by Mr LaRonde. But if you can tell me how to put a minus in there properly, it’s the first thing I’ll try.

Thanks.

[Darby Edelen]

You should be able to find a solution by parenting all of your tracked layers to a null and manipulating the Null in some fashion. My first suggestion would be to try parenting them to the Null and then scaling it to -100% on the Y-axis (leave the X axis set to 100%, you’ll need to unlink them to do this).

Then delete the Null. I think that should work.

Darby Edelen
Lead Designer
Left Coast Digital
Santa Cruz, CA

[S. Marcotte]

Mr Ebberts from the Expressions forum handed me this for the null’s position parameter:

[value[0],thisComp.height – value[1]]

So far, seems to work like a charm.