From 29bfd2cc8798bb9e91c650f1d34871bfd236a147 Mon Sep 17 00:00:00 2001
From: Justin Lin <caterpillar@openhome.cc>
Date: Mon, 13 Apr 2020 08:53:57 +0800
Subject: [PATCH] only replace when fc != "F"

---
 src/experimental/lsystem2.scad | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/experimental/lsystem2.scad b/src/experimental/lsystem2.scad
index b00ad56d..89d9cd23 100644
--- a/src/experimental/lsystem2.scad
+++ b/src/experimental/lsystem2.scad
@@ -4,7 +4,7 @@ use <turtle/turtle2d.scad>;
 function lsystem2(rule, n, angle, leng = 1, heading = 0, start = [0, 0], forward_chars = "F") =
     let(
         derived = derive(rule, n),
-        codes = _join([
+        codes = forward_chars == "F" ? derived : _join([
             for(c = derived)
             let(idx = search(c, forward_chars))
             idx == [] ? c : "F"