Users often require certain areas of a model excluded from the triangulation of that model, i.e rivers, lakes etc. The PBRK string is provided specifically for this purpose.
The PBRK string is a point string containing only null level points and given the name PBRK. Normally, null level points are ignored during the building of the triangulation, but the points of the PBRK string are included in the calculation process. This effectively creates a void in the triangulation.
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