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. 2017 Jun 2;25(4):1059–1127. doi: 10.1007/s11831-017-9220-9

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© The Authors 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 18 — Representation of the object shown in Fig. 12a by means of a CSG tree: the object is specified by a composition of simple solids using Boolean operations, i.e., union (U) and difference (−)