**Reference**:- Amartya Shankha Biswas, Erik D. Demaine, and Jason S. Ku, “Efficient Origami Construction of Orthogonal Terrains using Cross-Section Evolution”, in
*Origami*, Oxford, England, September 5–7, 2018.^{7}: Proceedings of the 7th International Meeting on Origami in Science, Mathematics and Education (OSME 2018) **Abstract**:-
We introduce a new method of origami construction, using cross section diagrams.
Instead of beginning our construction from a 2-dimensional sheet of paper,
we consider a 1-dimensional cross section moving forwards in time.
We obtain conditions for the validity of a particular cross section evolution sequence,
and prove that the resulting folded state is
*isometric*to a flat sheet of paper.Subsequently, we use this machinery to design an efficient construction of orthogonal terrains, with

*arbitrary rational extrusion heights*. **Length**:- The paper is 16 pages.
**Availability**:- The paper is available in PDF (667k).
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Last updated January 13, 2020 by Erik Demaine.