From 262308b9b9ec15bda3b16cbf917436c8e9a69502 Mon Sep 17 00:00:00 2001
From: Wenzel Jakob <wenzel@cs.cornell.edu>
Date: Fri, 5 Oct 2012 00:24:15 -0400
Subject: [PATCH] Rectangle::getSurfaceArea() was wrong

---
 src/libbidir/SConscript  | 4 ++--
 src/shapes/rectangle.cpp | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/libbidir/SConscript b/src/libbidir/SConscript
index ac7e4ddb..5a78630c 100644
--- a/src/libbidir/SConscript
+++ b/src/libbidir/SConscript
@@ -3,8 +3,8 @@ Import('env', 'sys', 'os')
 bidirEnv = env.Clone()
 bidirEnv.Append(CPPDEFINES = [['MTS_BUILD_MODULE', 'MTS_MODULE_BIDIR']])
 
-#bidirEnv.RemoveFlags(['-O3'])
-#bidirEnv.Append(CXXFLAGS = ['-O0']);
+# bidirEnv.RemoveFlags(['-O3'])
+# bidirEnv.Append(CXXFLAGS = ['-O0']);
 
 libbidir = bidirEnv.SharedLibrary('mitsuba-bidir', [
 	'common.cpp', 'rsampler.cpp', 'vertex.cpp', 'edge.cpp',
diff --git a/src/shapes/rectangle.cpp b/src/shapes/rectangle.cpp
index 63e937f9..c4055818 100644
--- a/src/shapes/rectangle.cpp
+++ b/src/shapes/rectangle.cpp
@@ -119,7 +119,7 @@ public:
 	}
 
 	Float getSurfaceArea() const {
-		return 4 * m_dpdu.length() * m_dpdv.length();
+		return m_dpdu.length() * m_dpdv.length();
 	}
 
 	inline bool rayIntersect(const Ray &_ray, Float mint, Float maxt, Float &t, void *temp) const {