[R] Points on a sphere

[Duncan Murdoch]

I don't have code for this in R, but a general technique I've used is
as follows:

Start with 4 points at the corners of a regular tetrahedron.  Then
recursively subdivide each triangular face into 3 triangular faces by
placing a point at the center of it. This is easy, just average the 3
vertices and normalize to length 1.   The only tricky part is keeping
track of which vertices form faces.

Duncan Murdoch
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