Geodesic Dome Structure Simulator (2D)

Subdivision

Frequency (v) 2

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Frequency 2 (2V) dome — drag to spin, scroll to zoom.

Live Readout

Triangles

Struts (edges)

Distinct strut lengths

Vertices

Longest / shortest strut

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How it works

A geodesic dome starts from an icosahedron — 20 equilateral triangular faces wrapped around a sphere. Each face is then cut into a grid of v × v small triangles (the "frequency"), and every new grid point is pushed radially outward until it lies back on the sphere.

That last step is the trick: pushing a flat grid point onto a curved sphere stretches some grid edges more than others, so a real geodesic dome never has just one strut length — it needs several distinct lengths depending on frequency, all extremely close but not identical. A 1V dome uses only the original icosahedron edge; by 4V or 6V a real structure needs a handful of near-identical strut classes, which is exactly why prefabricated dome kits ship struts in labelled length groups (A, B, C…) rather than one universal part.

Higher frequency also means more, smaller triangles, which is why large geodesic structures (planetariums, Spaceship Earth at EPCOT) use high frequencies: smaller triangles approximate a smooth sphere better and let every strut carry a similar, manageable share of the load.

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Strut length classes