PLINEGEN system variable
Linetypes are normally generated from vertex to vertex ( 0). Polylines of which the vertices are very close together might be rendered as a continuous line, if the linetype pattern does not fit between two subsequent vertices. When set to 1, the linetype is drawn from one end of the polyline to the other end, instead of from vertex to vertex.
Off (0): Polylines start and end with a dash at each vertex
On (1): Linetype in a continuous pattern around the polyline vertices