Hi DesuDeus, for the second one (change size based on position in array), there is a plug-in called ScaleArray which I think will do what you want:
http://moi3d.com/forum/index.php?webtag=MOI&msg=275.109
The way you use it is you create an array using whatever array tool you want, for your case wanting a linear array you'd use ArrayDir.
You need to include a point object along with the items to be arrayed, that point object will be used as the center of scaling. After you generate the array with center points included, then the ScaleArray plug-in can be used to do a changing scale operation on each array instance.
I don't believe that there is anything currently set up to do the first spacing one that you are asking about though.
- Michael
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