Here is a video of me building a nice house on a hillside. The video is a bit long (38min) even if it plays at double the speed. You may want to get some snacks.
Here is one shot of the house, it is far from finished, but I really like the view out of the bedroom:
Here is the video:
The video shows how anything from the world can be removed. You can also add new blocks, which are all square, pretty much like Minecraft.
But unlike Minecraft, you can use tools to smooth out the blocks creating nice curves and slopes. The idea is to work initially in squares, then smooth it out as needed. Smoothness and slopes comes in a second phase. Otherwise it would be too difficult to place them and control the resulting shapes. I think it is the best approach possible. It combines the simplicity of square blocks with the rich appearance you can find everywhere else in this virtual world.
Something else about the video. Right at the beginning you can see a green progress bar. This is how long it takes to get into the world, no matter if you are starting it from scratch.
This video was taken from a i5 with 4 cores, running a Radeon 4770.
I continued to work on the house after I stopped recording. The save data for the entire world is around 300K.
As usual I look forward to you opinions and questions.