How I’m Building a Minecraft Geometry Planner for Circles, Domes and Large Builds

Minecraft builders often need to create circles, domes, towers and other shapes using square blocks.

The hard part is not knowing that a circle is possible. The hard part is planning the block layout, keeping the centre aligned, estimating materials and handling large builds without losing count.

I’m building MC Build Planner to make that workflow easier.

The problems I wanted to solve

• Choosing a useful circle diameter
• Handling odd and even centre points
• Planning material stacks before building
• Finding coordinate anchors for large projects
• Building spheres and domes layer by layer
• Avoiding unreadable giant grids for mega builds

How the planner approaches geometry

For a small build, a visible block grid is useful. A builder can inspect the outline and copy the pattern directly.

For larger builds, a massive grid becomes impractical. The better workflow is:

1. Set a centre coordinate
2. Mark north, east, south and west anchors
3. Build one repeatable quadrant
4. Mirror the quadrant around the centre
5. Track materials and progress

Open-source geometry core

The geometry helpers are public here:

https://github.com/mubasharalidotcom/mc-build-planner-core

The repository currently covers planning logic for circles, ovals, half circles, quarter circles, rings, spheres, domes, cylinders and cone roofs.

Live project

The live planner is here:

https://mcbuildplanner.com/

I’m still improving the builder workflow, especially for large structures and layer-by-layer plans.

What shape-planning problem would you want a Minecraft tool to solve?