This command can be used to trim a group of contour lines or polyline entities that cross a perimeter defined by a 2D polyline. The trim can be executed on the inside or the outside of the perimeter.
Warning: All of the trim perimeter
should be visible on the screen!
Select polyline which represents perimeter: select trim
perimeter
Pick point on the side of perimeter to trim from: pick
a point To trim contours on the inside of the perimeter, pick a
point on the
inside of the perimeter (this is useful for deleting contour lines that
fall inside a building or
some area that you want void of contours). To trim contours on
the outside of the perimeter, pick a point outside of the
perimeter.
Pulldown Menu Location: Surface > Modify Contours
Keyboard Command: polytrim
Prerequisite: Draw a 2D closed polyline perimeter.
File Name: \lsp\polytrim.lsp