this should cause each dot scale up as the luminance of the sample point area changes with the wipe.
Causing each dot to pop up and settle back down to its resting size.
I separated these dots in AI to layers - there are over 1,300 layers and unsurpirsingly AE cant handle it.
it only just imported the file, let alone applying expression...lots of spinning beachball.
I think I need a different route, perhaps using Trapcode form or Particular.
Form is a good idea, but it'd be hard to get the irregular layout you have here.
Particular would work better for the layout, but it'll be harder to control the particles' entrances.
sampleImage() is slow. What if you animated a few nulls from bottom to top and referenced their vertical position in the expression (plus or minus some small random amount for each layer) instead?
You could also split up the comp by continent to try to make it easier to work with.
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Thanks - little bit trickier than I first thought this - good call on referencing nulls pos instead although, not that expert on writing expressions (I vaguely understand this one from a tutorial..) I'll give it a go referencing nulls - will repost if I get stuck (quite likely!)
I think youre right about sampleImage being slow. Also divide up the artwork up seperate comps too..