Basic Hex Map Sphere: A Beginner’s Guide

From Flat to Round: Building a Basic Hex Map Sphere

What it is

From Flat to Round is a step-by-step guide for converting a flat hex map (hexagonal-tiled world map used in tabletop games, strategy maps, or cartography exercises) into a simple spherical model where the hex grid wraps around a globe-like shape. The goal is a basic, playable sphere—accurate enough for navigation and aesthetics but simple to build.

Who it’s for

• Tabletop RPG and wargame creators wanting a globe-style play surface
• Worldbuilders who prefer hex-based systems and want a spherical representation
• Hobbyists making physical or digital props with minimal geometry math

Key concepts

• Hex projection trade-offs: Regular hex grids can’t perfectly tile a sphere without distortion; expect stretched or irregular hexes near seams or poles.
• Approach choice: Use either a polyhedral approximation (project hex centers onto a subdivided icosahedron) or a wrapped cylindrical/latitude method (simpler but with polar distortion).
• Seams and poles: Design seam handling (where map edges meet) and pole treatment (caps or special tiles) early to avoid topology issues.

Materials / tools (digital and physical)

• Digital: image editor (GIMP/Photoshop), 3D modeling tool (Blender), map-editing software (Hexographer, Worldographer)
• Physical: printed hex map, foam or paper globe armature (styrofoam ball, paper mâché), craft knife, glue, clear coat

Step-by-step (practical, minimal-math workflow)

1. Prepare a rectangular hex map sized to match your chosen wrapping method (e.g., 2:1 width:height for equirectangular-style wrapping).
2. Choose a projection method:
   • Cylindrical wrap: Treat left/right edges as seam; stretch near poles. Best for simple prints onto spheres.
   • Icosahedral projection: Subdivide an icosahedron, project hex centers—better uniformity, more setup.
3. Adjust edges: Ensure left and right map edges tile seamlessly (matching terrain, labels, hex alignment).
4. Handle poles/seams: Decide whether to place special cap tiles at poles or accept distorted hexes; for physical builds, use smaller cap polygons.
5. Transfer to sphere:
   • Physical: Print map in panels, glue to foam sphere in strips, smooth seams with filler, seal.
   • Digital/3D: UV-map your hex texture onto a sphere mesh in Blender; tweak UVs at poles/seams.
6. Refine visuals: Touch up stretched hexes, redraw key hexes near seams, add latitude/longitude or decorative meridians to hide distortion.
7. Test gameplay: Verify movement rules across distorted hexes; optionally define special rules for polar or seam hexes.

Tips and shortcuts

• For rapid physical builds, use a paper mâché ball and apply the map in 6–8 vertical strips.
• If accuracy matters, use an icosahedron-based method and accept extra time for mesh/UV work.
• Label hex coordinates before wrapping to avoid misalignment.
• Use decorative elements (mountain chains, oceans) to mask seam artifacts.

Common pitfalls

• Misaligned left/right edges causing visible seams.
• Ignoring pole distortion which can break movement equivalence.
• Overcomplicating hex regularity—simple approximations are often acceptable for play.

Outcome

A functional hex-sphere suitable for tabletop play or display: a compromise between geometric accuracy and ease of construction, with clear choices for projection method, seam handling, and practical transfer techniques.