From 507c7ec226097b286b0b3306007b221fe11bc5d3 Mon Sep 17 00:00:00 2001
From: Justin Lin <justin.sdk@gmail.com>
Date: Sat, 26 Jun 2021 18:35:32 +0800
Subject: [PATCH] refactor

---
 src/surface/sf_thicken.scad | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/surface/sf_thicken.scad b/src/surface/sf_thicken.scad
index 2ef1b87e..10d384df 100644
--- a/src/surface/sf_thicken.scad
+++ b/src/surface/sf_thicken.scad
@@ -65,8 +65,9 @@ module sf_thicken(points, thickness, direction = "BOTH") {
                     vertex_normal(points, x, y)
             ]
         ];        
-        half_thickness = thickness / 2;
+        
         if(direction == "BOTH") {
+            half_thickness = thickness / 2;
             surface_top = points + half_thickness * vertex_normals;
             surface_bottom = points - half_thickness * vertex_normals;    
             sf_solidify(surface_top, surface_bottom);