John Trengrove

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Geodesic Sphere

05 Jul 2014

Another interesting d3.js example is Bostock's rainbow geodesic.

I wanted to understand exactly how it worked, so I went slowly through the source code, removing anything I thought uneeded, and playing with how things fit together. It uses the d3.geodesic plugin for splitting up the sphere into faces, d3.hsl for colour, d3.geo.orthographic to project onto a sphere, and d3.geom.polygon for working out areas of the triangles. The d3.js source code is very worthwhile for understanding all of this.

As an alteration, I added a timer that cycles through geodesic spheres with different subdivisions.