"LOL. I can make micro-elements; man hole, drain in crubs, stop lights, and street lights. Once it is all made on a block and I can duplicate it before I may use dynamic extrusion." I'm sure you can, but the purpose of a greeble plugin is to do those micro-elements automatically for you, and give you the ability to change that result on the fly if you don't like it afterwards. Doing it by hand once, then duplicating that result multiple times isn't quite the same as not having to do it once by hand, and not having to duplicate it. ;-) I like the terrain meathod, it looks good... and you can always add the illusion of more complex geometry with maps and shaders, but... sometimes you need actual geometry (ie., for close camera panning and fly-bys in animation). I'm sure a Greeble plugin would be useful to the Carrara community, and relatively simple to make. You could also create a great greeble effect using low polys with displacement maps, if Carrara has micro-triangle displacement rendering.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.