There is the polyline with linewidth in Autocad. How can I make it in rhino as same as this effect?
What you are showing is not possible I think.
Using PrintDisplay (State=on) shows the relative linethicknesses of the curves, these don’t scale when zooming in/out.
if you are talking about a dashed line with an arrow head, you can use the command
arrowhead and adjust the dash scaling in options.
this method only set the display or print, not the actual width of the line
e.g. draw a 100mm width line with this hidden pattern， and will be trim, extend, etc opperation
As I said, I don’t think it’s possible in Rhino.