Bob the Boxelizer added some bells and whistles to Christopher Diggins' Voxelizer in the Sample Pack. Probably more useful to mographers....or use Bottom up method to illustrate 3D printing..
Video here: http://1drv.ms/1Itid08
Ver 1.01.00: the voxels are now 'cubic', ie. uniform in all dimensions, not oblong if your orig geo was oblong. Also added option to pick building block instead of default 'box'.