Hi, I've thrown to versions of a voxel viewer at the snippets board. They both work, however some expertice in meshes is required, since that is as far as I can get it.
The one version is using an image for coloring the object - which is visually right, but seems stupid to make an image just to texture an object like that.
The other version is coloring through the diffuse parameters, which is not visually correct, but nicer to code and you'd avoid using the image.
http://forum.thegamecreators.com/?m=forum_view&t=170397&b=6
http://forum.thegamecreators.com/?m=forum_view&t=170397&b=6