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superlimo

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There are several ways to do it, i think a quick way is to have a highly dense grid with a line sop with some expressions to randomly add noise. You would use the line to bend (magnet sop) the grid and group it along the way which would then change the shader or you could use the pic expression to change the image of the grid.

Another dirty way would be compositing the image in later to change. Hope this helps

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There are tutorials that will provide components (if not everything) for the final effect you need.

Do a search for pin cushion or pin table:

and this one for the pic() expression:

http://www.sidefx.com/index.php?option=com_content&task=view&id=1423&Itemid=132

And in this one you have much more a kind of particle wave to the effect you are looking for:

http://www.3dbuzz.com/xcart/product.php?productid=58

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