From 56a5c4a077321d56c54571d3e2637750f7f984bf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tom=C3=A1=C5=A1=20Pecs=C3=A9rke?= <tomas.pecserke@gmail.com>
Date: Fri, 21 Jul 2023 14:07:05 +0200
Subject: [PATCH] Fix vertext range assert false positive when
 `associate_vertices` is passed empty split

---
 skin.scad | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/skin.scad b/skin.scad
index 32a63e7..419706d 100644
--- a/skin.scad
+++ b/skin.scad
@@ -2677,7 +2677,7 @@ function associate_vertices(polygons, split, curpoly=0) =
     assert(len(cursplit)+polylen == len(polygons[curpoly+1]),
            str("Polygon ", curpoly, " has ", polylen, " vertices.  Next polygon has ", len(polygons[curpoly+1]),
                   " vertices.  Split list has length ", len(cursplit), " but must have length ", len(polygons[curpoly+1])-polylen))
-    assert(max(cursplit)<polylen && min(curpoly)>=0,
+    assert(len(cursplit) == 0 || max(cursplit)<polylen && min(curpoly)>=0,
            str("Split ",cursplit," at polygon ",curpoly," has invalid vertices.  Must be in [0:",polylen-1,"]"))
     len(cursplit)==0 ? associate_vertices(polygons,split,curpoly+1) :
     let(