How to build a sphere layer by layer
- Choose the size. Enter the diameter in blocks. A sphere is as tall as it is wide, so a 21-block sphere is 21 layers high.
- Mark the center column. Place a pillar where the middle of the sphere should be. Every layer is centered on it, shown by the yellow lines.
- Build from the bottom. Start at layer 1, build it, go up one block and press ▶ for the next layer.
- Use the faded outline. It shows the layer you just built, so you can see whether the next ring steps outward or inward.
Domes for roofs and biodomes
A dome is the top half of a sphere. Set the shape to Dome and the chart starts at the widest layer. To put a dome on a round tower, build the walls with the circle generator using the same diameter, then add the dome layers on top. Glass domes work well for greenhouses and underwater bases.
Tips for big spheres
- The block count assumes a hollow shell one block thick. Turn on Solid to see how many blocks a filled sphere needs; it is usually many times more.
- Odd diameters have a single center block on each layer, which keeps everything symmetric.
- For very large builds, place the outline of each layer in a temporary block first and check it from above before using expensive materials.