Check out these roofs: http://www.victoriaheritagefoundation.ca/images/Glossary/Roo... These are all trivial with polygons, but AFAIK impossible with voxels, no matter which rendering algorithm you use.

Check out the roofs I made with voxels: http://www.voxelquest.com/uploads/9/5/4/0/9540564/3786947_or... its possible, just depends on your resolution and style. I use voxels with normals (direction of light reflection) which is unusual in most voxel art.

Cool project! I've been following it.

Out of curiosity, do you still feel that voxels are worthwhile? Compared to the amazing stuff that you can achieve with polygons, e.g. http://www.orsispanyol.com/art/.

In your typical commercial project it would be pretty foolish to use anything other than polygons, just because that is where the tools, engines, and APIs are at.

Still, from the perspective of making something unique looking, many people seem to like voxels. It is almost comparable to the preference of pixel art over vector art. As a warning, if you do anything with voxels, even just something Minecraft-ish, you will be opening the floodgate for many technical battles. :) From a conservative perspective, it is hard to justify the use of them.