You may want to convert toon lines to polygons to manipulate them as geometry, or to render the toon lines in mental ray or in the Maya Hardware renderer.
To convert toon lines to polygons
This value indicates that when converting the toon lines to polygons, it should stop after it has reached approximately this number of faces. This can be used to avoid creating excessively large meshes that could cause you to run out of memory. The default is 100 000. A value of 0 indicates no limit.