Hello! I have a scattered model falling into lot of pieces, and i add a noise of red color so the pieces with Black color turn red, and i would like to scale the pieces depending on the amount of red.

So if the res is 1, the size of the pieces is 1.

How can i do that? Im sure ill need to use the foreach but i cantón get these effect.
Tnanks forma all!

You don't really need a for loop, just an AttributeWrangle (which is essentially a multi-threaded loop processor) running over the primitives.
This will set the scale equal to the red color. You can also multiply the scale as needed.