Cycles "Voxels"

Im sure all of you have played Minecraft before and wanted to try something like it in blender... Well I figured out a way while messing with the last post about Lego :D!!! Here is the blend

Here is a basic example of how to do this. I will try to explain what is going on.

Ok so I am using a Voronoi which is a 3D texture to mix between a diffuse and a transparent. The reason this works is because im using from dupli on the texture coordinates node which applies the material of your object even when its duplicated with dupliverts or particle systems.

Also for this to even work you need to set the transparent bounces to a huge number (I used 150). The only problem with this method is it is VERY VERY slow and its almost impossible to fully converge other than that its pretty awesome :D

Here is the particle system settings