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You could add a null, make the null the parent of your tracked layer, then scale the null.
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Effect --> Distort --> Transform. Using that all the time...
Many thanks for the multiple solutions . Will try asap.
Thanks to all the above but they all produce the same effect i.e. the layer I'm pasting track info into, when scaled, also scales the tracking data. This means the relative postions are moving against the tracked BG. The idea of precomping I thought would work but it appears the track data also scales when pasted in so NG I fear. The null layer parenting had the same effect but I then tried pasting the track data into the parented layer only. Now if I try to position the pasted in layer it is locked to the parent BUT the track data in the parent layer is not followed by the child layer. I don't understand that. You can see the position data change in the null layer but the other one refuses to move with it. Thanks for the ideas anyway. I should have said that the unresized layer I'm pinning in tracks in perfectly, I can reposition it etc. but as soon as I want to tweek the scale it starts floating.
Thanks so much for your help. I did read it. May not have understood properly and will try again. Once again thanks.
As an confirmed idiot I have ploughed on. After tracking in Mocha and exporting to AE5.5 the scale of the image in the layer pasted to is controled by the corner pin data taken from the planar points set up in the Mocha track. Any rescaling after this on the layer will throw the track off as the track points are all scaled with the layer, i.e the offset data is always fixed to the layer position matrix. I can't see a work round other than using an expression to reverse scale the data points. I could be bonkers of course but having spent a couple of days on this and watched the data as I do each variation and suggestion it all comes back to the same thing. Many thanks fellows!
I do this kind of thing all the time and you're missing something. I don't have the time for a complete step by step but try these ideas.
- First, make sure that the layer you're going to apply the Mocha corner pin tracking data to is the same size as the composition.
- Apply the tracking data.
- Pre-compose the layer you've applied the tracking data to making sure to leave all data in the comp. Do not move all attributes to the new composition.
- Open up the pre-comp and scale the layer only layer inside.
There you go. The same thing would work if you pre-composed the layer before you applied the tracking data.
The other option.
- After applying the corner pin data either add an expression slider to the tracked layer.
- Add this expression to the scale property.
value + [effect("Slider Control")("Slider"), effect("Slider Control")("Slider")]
- After applying the corner pin data to your layer add a null.
- Set the scale of the null to 0.
- Add an expression to the scale property of the corner pinned layer by typing "value + " then draging the expression pickwhip to the scale value of the null.
It's your choice. They all work perfectly. There are at least a dozen other techniques that I can think of.
Item 3 on the list was my mistake. I assumed the other option. Many thanks everyone for helping out this old duffer!