It's difficult to explain in a succinct way and there are large functions involved but the jist of it is as follows...
lay out a grid of shapes in an fx map. Sample outward from each shape in as many directions as you can be bothered at a radius you decide is sensible. Move the shape towards the brightest sample.
Alternatively you can drive scale/rotation/whatever by an input image
There are some gotchas regarding what designer thinks is 0 and what is logically 0 but it's actually not terribly complicated to build what amounts to a particle system.
Alternatively, muck around with the title sampler, it might get you what you need
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lay out a grid of shapes in an fx map.
Sample outward from each shape in as many directions as you can be bothered at a radius you decide is sensible.
Move the shape towards the brightest sample.
Alternatively you can drive scale/rotation/whatever by an input image
There are some gotchas regarding what designer thinks is 0 and what is logically 0 but it's actually not terribly complicated to build what amounts to a particle system.
Alternatively, muck around with the title sampler, it might get you what you need