From 8d10aa298295a31c2bc2ad1bae4f2edc364bed38 Mon Sep 17 00:00:00 2001
From: Marius Kintel <marius@kintel.net>
Date: Wed, 21 Dec 2011 17:43:01 +0100
Subject: bugfix: surface() modules with center=true wasn't exactly centered in
 the XY plane


diff --git a/src/surface.cc b/src/surface.cc
index 1a5f9bd..39d1972 100644
--- a/src/surface.cc
+++ b/src/surface.cc
@@ -129,8 +129,8 @@ PolySet *SurfaceNode::evaluate_polyset(class PolySetEvaluator *) const
 
 	p->convexity = convexity;
 
-	double ox = center ? -columns/2.0 : 0;
-	double oy = center ? -lines/2.0 : 0;
+	double ox = center ? -(columns-1)/2.0 : 0;
+	double oy = center ? -(lines-1)/2.0 : 0;
 
 	for (int i = 1; i < lines; i++)
 	for (int j = 1; j < columns; j++)
-- 
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