The first pass generate the heightmap and the second is responsible to create the mesh and perform the lightning calculation.
And here follows the webplayer to you guys give a try to the engine. In the case that the previous link didn't work, you can download the demo here.
There is a lot of things to enhance, and many parts to optimize but I'm done with this project. In the next days I will post the project with all sources and assets so it may help someone that is thinking to study voxels.