From 0f39f10dba52fe7734160d99faafe9970eca3e82 Mon Sep 17 00:00:00 2001
From: Adrian Mariano <avm4@cornell.edu>
Date: Tue, 28 May 2024 19:12:27 -0400
Subject: [PATCH] fix attach() bug

---
 attachments.scad | 2 +-
 shapes3d.scad    | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/attachments.scad b/attachments.scad
index fe3cd9b..82b9066 100644
--- a/attachments.scad
+++ b/attachments.scad
@@ -916,7 +916,7 @@ module attach(parent, child, overlap, align, spin=0, norot, inset=0, shiftout=0,
         anchor_data = _find_anchor(anchor, $parent_geom);
         anchor_pos = anchor_data[1];
         anchor_dir = factor*anchor_data[2];
-        anchor_spin = !inside || anchor_data[3]==0 ? anchor_data[3] : 180+anchor_data[3];
+        anchor_spin = !inside || anchor==TOP || anchor==BOT ? anchor_data[3] : 180+anchor_data[3];
         $anchor=anchor;
         for(align_ind = idx(align_list)){
             align = is_undef(align_list[align_ind]) ? undef
diff --git a/shapes3d.scad b/shapes3d.scad
index d45589a..f6ee63b 100644
--- a/shapes3d.scad
+++ b/shapes3d.scad
@@ -130,6 +130,10 @@ function cube(size=1, center, anchor, spin=0, orient=UP) =
 //   orient = Vector to rotate top towards.  See [orient](attachments.scad#subsection-orient).  Default: `UP`
 // Example: Simple regular cube.
 //   cuboid(40);
+// Example: Cuboid with a corner at the origin
+//   cuboid(40, anchor=FRONT+LEFT+BOT);
+// Example: Cuboid anchored on its right face
+//   cuboid(40, anchor=RIGHT);
 // Example: Cube with minimum cornerpoint given.
 //   cuboid(20, p1=[10,0,0]);
 // Example: Rectangular cube, with given X, Y, and Z sizes.