Schoenberg Curve

The Schoenberg curve is a fractal plane-filling curve, similar to the Peano, Hilbert, Moore, Lebesgue, and Wunderlich curves. The definition of the Schoenberg curve begins with a piecewise sawtooth-like function whose value falls between 0 and 1.

baseline sawtooth function

The curve is defined parametrically using sums of scaled copies of the original function. The first iteration is a one-half scale copy of the sawtooth function, beginning at the point (0, 0) and ending at (1/2, 1/2).

stage 1

The second iteration adds a one-quarter scale copy to the previous copy, ending at (3/4, 3/4).

stage 2

Each iteration spans more of the unit square. In its limit, the Schoenberg curve touches every point in the unit square.

stage 3 stage 4 stage 5

Same idea in 3-D, for filling the unit cube:

3-D, stage 1 3-D, stage 2 3-D, stage 3 3-D, stage 4

See I. J. Schoenberg and C. de Boor (ed.), “On the Peano Curve of Lebesgue”, in I. J. Schoenberg: Selected Papers Vol. 1, Boston: Birkhäuser, 1988.

Designed and rendered using Mathematica 7.0 and 10.0.

Copyright © 2010–2017 by Robert Dickau.

[ home ] || [ 2015-05-02 ]