PBRK Strings (v8i)The PBRK string is a point string containing only null elevation points and given the name PBRK. Normally, null elevation points are ignored during the building of a triangulation, but the points of the PBRK string are included in the calculation process.
Prior to generating a triangulation, an area of a model can be excluded from
subsequent analysis such as contours by use of a PBRK string. The PBRK
string is provided specifically for this purpose.
Any resulting triangles which have a null elevation at one or more vertices are excluded for the purpose of subsequent analysis of contours, flow arrows etc.
Therefore the inside of a building can be excluded by the inclusion of a single PBRK string point near the buildings