Minecraft Dome Generator: Hollow Dome Blueprints by Layer

A dome you build from the ground up

Enter the base diameter and, if you want, a dome height. Leave the height empty and the dome is half as tall as it is wide, rounded up, which makes a hemisphere. A taller number gives a pointed, egg-like cap and a shorter number gives a flatter roof. Layer 1 is the floor ring, and the last layer is the cap.

How the dome is calculated

A block belongs to the dome when its center lies inside the ideal shape. The page tests the center of every block in the bounding box and keeps the ones that pass, so the result is symmetric and the counts are exact for the size you type.

The dome is the top part of an ellipsoid whose center sits on the floor, with the horizontal radius from your diameter and the vertical radius from your height. Hollow keeps only blocks that have at least one face open to the outside, which leaves a shell you can walk through with no gaps between blocks that share a face. A thick shell also keeps blocks that touch the outside only at an edge or a corner, which gives a sturdier wall. Filled keeps every block.

By default the floor is left open, so the bottom layer is only a ring and you can walk in. Tick Closed floor to add a floor.

Building it layer by layer

Layer 1 is the bottom. Use the slider or the arrow buttons to step up, and compare each chart with the faint gray blocks, which are the layer you just placed underneath. The center lines run through the middle of the build, and the number at the end of each row is how many blocks to place in that row.

• Start with the widest ring. Low layers move in by only a block or two, while the last layers shrink quickly.
• Where a layer is much smaller than the one below, expect a flat ledge. That is the nature of a block dome, and a taller height smooths it.
• Check the last layer: it is a solid disc that closes the top.
• For a lit interior, choose Hollow and keep the floor open so you can place blocks from inside.