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. 2012 Aug 14;12(8):11249–11270. doi: 10.3390/s120811249

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© 2012 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 5. — Example of a tunnel portion generated using a 2D mesh algorithm (a); and a successfully constructed 3D irregular mesh model (b); The problems associated with the use of a 2D mesh algorithm are evident at the top areas where the TIN triangles are actually “filling up” the space rather than forming a realistic representation of the tunnel surface. Also, at the sides of the tunnel the TIN (Triangulated Irregular Network) triangles are fictitiously elongated indicating failure in the 2D mesh model construction.