I am trying to model a tree-like structure with the plug-in Rabbit, but I found the "F" in it is always a line. Can I redefine it as a curve or surface? Is there anyone could help me with my problem? Thanks!
you can't redefine the 'F' symbol. If you need a curve you can use multiple line segments to form the curve. You can have multiple L-Systems+Turtles and loft them to obtain a surface.