Minecraft Cone Generator: Spire and Roof Layer Charts

Cones for roofs, spires and volcanoes

Enter the base diameter and the height. The radius shrinks in a straight line from the base to the tip, so a tall, thin cone makes a spire and a short, wide one makes a gentle roof or a volcano. The default is open at the bottom, which suits a roof you put on top of a round tower.

How the cone is calculated

A block belongs to the cone 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.

For each layer the allowed radius is the base radius times the fraction of height that remains above that layer. 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.

If the cone is so tall and thin that the top layers have no block centers inside the shape, those layers are left out and the page tells you so.

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.

• Build from the base ring upward. With a tall cone, several layers in a row will look the same before the ring steps in.
• Close to the tip, the layers shrink to a few blocks; place the last single block or 2 × 2 last.
• To roof a tower, make the cone base the same diameter as the tower, or one or two blocks wider for an overhang.
• Tick Closed floor if the cone will be a standalone shape instead of a roof.