From 5849718ed54619fb8cf26a29d1ac343970c63892 Mon Sep 17 00:00:00 2001
From: Justin Lin <caterpillar@openhome.cc>
Date: Wed, 19 Feb 2020 12:49:50 +0800
Subject: [PATCH] change dir

---
 src/experimental/sf_square.scad | 30 ++++++------------------------
 1 file changed, 6 insertions(+), 24 deletions(-)

diff --git a/src/experimental/sf_square.scad b/src/experimental/sf_square.scad
index 980d3c16..aab769db 100644
--- a/src/experimental/sf_square.scad
+++ b/src/experimental/sf_square.scad
@@ -6,44 +6,26 @@ use <experimental/sf_solidify.scad>;
     invert: inverts how the gray levels are translated into height values.
 */
 module sf_square(levels, thickness, invert = false) {
-    columns = len(levels);
-    rows = len(levels[0]);
-    
+    rows = len(levels);
+    columns = len(levels[0]);
+    offset_z = invert ? thickness : 0;
     size = [columns - 1, rows - 1];
 
-    surface1 = [
-        for(r = [0:rows - 1]) 
-        [
-            for(c = [0:columns - 1]) 
-            let(lv = invert ? 255 - levels[c][r] : levels[c][r])
-            [c, r, lv / 255 * thickness]
-        ]
-    ];
-
-    surface2 = [
-        for(r = [0:rows - 1]) 
-        [
-            for(c = [0:columns - 1]) 
-            [c, r, 0]
-        ]
-    ];
-
-    offset_z = invert ? thickness : 0;
     sf_solidify(
         [
             for(r = [0:rows - 1]) 
             [
                 for(c = [0:columns - 1]) 
-                let(lv = invert ? 255 - levels[c][r] : levels[c][r])
+                let(lv = invert ? 255 - levels[rows - r - 1][c] : levels[rows - r - 1][c])
                 [c, r, lv / 255 * thickness + offset_z]
             ]
         ],
-        [
+         [
             for(r = [0:rows - 1]) 
             [
                 for(c = [0:columns - 1]) 
                 [c, r, 0]
             ]
-        ]      
+        ]     
     );
 }
\ No newline at end of file