Bdy is a filter used to find boundary curves in Geomview objects. The program reads a geomview object from standard input and prints the resultant vector object to standard output. Bdy finds the segments of the vector by first converting the given object into a polylist (See anytooff(1)). Then, it finds all edges used once and only once in the polylist and combines these edges into a vector object. The optional precision arguement specifies the maximum distance between vertices that are to be considered identical. By default, it is set to 0.0, indicating that the vertices must be numerically identical. It may sometimes be necessary to set it to a higher value to compensate for floating-point error.

The vector object is always black.

Celeste Fowler
The Geometry Center