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Expression to generate solids of different shapes to a grid?
I am working on some content for this LED sculpture:
Currently im working on a section of the video where there is a solid of different positions as size that flashes up to a rhythm, in which the pace ascends over time. This is what I have created so far:
https://goo.gl/photos/r82ud23c6yGQkQki6
Is there an expression, script or plugin that could automatically position squares or lines across the canvas differently for each frame? Or even better, lines / squares that snap to a grid that is linked to the canvas shape?
In after effects im just working with a flat canvas, which then gets mapped to the sculpture:
Thanks in advance!

