Trim polygon
Cropping polygons in Digi3D.NET is very easy with the command TRIM_POLYGON. All you have to do is select the polygon to crop and the boundary line, and the command will crop the polygon generating as many parts as necessary. The polygon to be cropped can be either a closed line or a polygon-type entity and the boundary line must be closed. If we also pass a parameter to the command, whatever it is, the line that acts as a boundary will be automatically removed. [youtube:http://youtu.be/FVQ9kSOTKPg]