It's a really cool project and performs reasonably well but I have issues with some of the interface choices: 1. The navigation controls are non-intuitive and

It's a really cool project and performs reasonably well but I have issues with some of the interface choices: 1. The navigation controls are non-intuitive and don't follow most 3D movement conventions. I wanted right-click panning and some shortcut for orbiting (not having to change modes). 2. Positioning is erratic. When building something it would randomly refuse to let me draw on top of some cubes even when I precisely positioned my cursor on the top cube surface. Positioning guides would be nice: Highlight adjacent surfaces, draw alignment axis, etc. 3. Conversely, erasing a bunch of blocks would fail because the erase cursor would "hop" on top of (some not all) blocks I wanted to erase. 4. The "thicken" operation sounds handy but never worked for me even once I figured out (I think) that you have to select blocks first. I expected I could select blocks and then pull them up or out to duplicate them. 5. Having a multiuser environment default to fill/drawing mode is a horrible idea since _everyone_ spews blocks all over the landscape destroying stuff before getting the hang of it. Suggestion: Give everyone a protected 30x30x30 home sandbox where no one else can draw. Everywhere else would be free range. Overall, you have the tech down but the UI needs playtesting. Watch novices and Minecraft-ers try doing something more than scribble with it. You'll know your interface is working when you start seeing more than blobs and piles littering your world.