From 521f0315bb0dbb7d33735e82e94d2a9b185c94f1 Mon Sep 17 00:00:00 2001
From: Werner Almesberger <werner@almesberger.net>
Date: Sat, 23 Jul 2011 14:34:26 -0300
Subject: [PATCH] cad/test2/button.scad: added overlaps to eliminate artefacts
 at coincident faces

---
 cad/test2/button.scad | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/cad/test2/button.scad b/cad/test2/button.scad
index 4a7b060..f764b10 100644
--- a/cad/test2/button.scad
+++ b/cad/test2/button.scad
@@ -35,7 +35,8 @@ module fillet_line(x, r)
 {
 	translate([-x/2, 0, 0])
 	    difference() {
-		cube([x, r, r]);
+		translate([0, -epsilon, -epsilon])
+		    cube([x, r+epsilon, r+epsilon]);
 		translate([0, r, r])
 		    rotate([0, 90, 0])
 		    translate([0, 0, -epsilon])
@@ -191,10 +192,10 @@ module button_base()
 {
 	translate([0, 0, -but_base_z])
 	    difference() {
-		rbox(but_base_x, but_base_y, but_base_z, but_corner_r);
-		rbox_chamfer_top(but_base_x, but_base_y, but_base_z,
+		rbox(but_base_x, but_base_y, but_base_z+epsilon, but_corner_r);
+		rbox_chamfer_top(but_base_x, but_base_y, but_base_z+epsilon,
 		    but_corner_r, but_chamfer_r);
-		rbox_chamfer_bottom(but_base_x, but_base_y, but_base_z,
+		rbox_chamfer_bottom(but_base_x, but_base_y, but_base_z+epsilon,
 		    but_corner_r, but_chamfer_r);
 	}
 }
@@ -204,6 +205,8 @@ module button()
 {
 	union() {
 		button_top();
+
+		/* Comment out this line to make CSG previews work */
 		button_base();
 	}
 }