diff --git a/doc/acknowledgements.tex b/doc/acknowledgements.tex
index 514f279b..af01b2bc 100644
--- a/doc/acknowledgements.tex
+++ b/doc/acknowledgements.tex
@@ -3,6 +3,8 @@ The architecture of Mitsuba as well as some individual components are based on i
 The architecture of the coherent path tracer traversal code was influenced by Radius from Thierry Berger-Perrin.
 Many thanks go to my advisor Steve Marschner, who let me spend time on this project.
 Some of the GUI icons were taken from the Humanity icon set by Canonical Ltd.
+The material test scene was kindly contributed by Jonas Pilo, and the environment map
+it uses is courtesy of Bernhard Vogl.
 
 Mitsuba makes heavy use of the following amazing libraries and tools: 
 \begin{itemize}
diff --git a/src/qtgui/aboutdlg.ui b/src/qtgui/aboutdlg.ui
index 285fa75a..413256f6 100644
--- a/src/qtgui/aboutdlg.ui
+++ b/src/qtgui/aboutdlg.ui
@@ -77,7 +77,7 @@
       <string>&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0//EN&quot; &quot;http://www.w3.org/TR/REC-html40/strict.dtd&quot;&gt;
 &lt;html&gt;&lt;head&gt;&lt;meta name=&quot;qrichtext&quot; content=&quot;1&quot; /&gt;&lt;style type=&quot;text/css&quot;&gt;
 p, li { white-space: pre-wrap; }
-&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-family:'Sans'; font-size:10pt; font-weight:400; font-style:normal;&quot;&gt;
+&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-size:10pt; font-weight:400; font-style:normal;&quot;&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-weight:600;&quot;&gt;About Mitsuba&lt;/span&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;Version MTS_VERSION&lt;br /&gt;Configuration flags: &lt;span style=&quot; font-family:'Courier New,courier';&quot;&gt;CONFIG_FLAGS&lt;/span&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;Mitsuba is an extensible rendering framework written in portable C++. It implements unbiased as well as biased techniques and contains heavy optimizations targeted towards current CPU architectures.&lt;/p&gt;
diff --git a/src/qtgui/acknowledgmentdlg.ui b/src/qtgui/acknowledgmentdlg.ui
index 69abbd2b..c658f979 100644
--- a/src/qtgui/acknowledgmentdlg.ui
+++ b/src/qtgui/acknowledgmentdlg.ui
@@ -47,12 +47,13 @@
       <string>&lt;!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0//EN&quot; &quot;http://www.w3.org/TR/REC-html40/strict.dtd&quot;&gt;
 &lt;html&gt;&lt;head&gt;&lt;meta name=&quot;qrichtext&quot; content=&quot;1&quot; /&gt;&lt;style type=&quot;text/css&quot;&gt;
 p, li { white-space: pre-wrap; }
-&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-family:'Sans'; font-size:10pt; font-weight:400; font-style:normal;&quot;&gt;
+&lt;/style&gt;&lt;/head&gt;&lt;body style=&quot; font-size:10pt; font-weight:400; font-style:normal;&quot;&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-weight:600;&quot;&gt;Acknowledgments&lt;/span&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;The architecture of Mitsuba as well as some individual components are based on implementations discussed in: &lt;a href=&quot;http://www.pbrt.org&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0000ff;&quot;&gt;Physically Based Rendering&lt;/span&gt;&lt;/a&gt; - From Theory To Implementation by Matt Pharr and Greg Humphreys.&lt;/p&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;The architecture of the coherent path tracer traversal code was influenced by &lt;a href=&quot;http://gna.org/projects/radius/&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0000ff;&quot;&gt;Radius&lt;/span&gt;&lt;/a&gt; from Thierry Berger-Perrin.&lt;/p&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;Many thanks go to my advisor &lt;a href=&quot;http://www.cs.cornell.edu/~srm/&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0000ff;&quot;&gt;Steve Marschner&lt;/span&gt;&lt;/a&gt;, who let me spend time on this project.&lt;/p&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;Some of the icons were taken from the &lt;a href=&quot;https://launchpad.net/humanity&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0000ff;&quot;&gt;Humanity&lt;/span&gt;&lt;/a&gt; icon set by Canonical Ltd.&lt;/p&gt;
+&lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;The material test scene was kindly contributed by Jonas Pilo, and the environment map it uses is courtesy of Bernhard Vogl.&lt;/p&gt;
 &lt;p style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;Mitsuba makes heavy use of the following amazing libraries and tools: &lt;/p&gt;
 &lt;ul style=&quot;-qt-list-indent: 1;&quot;&gt;&lt;li style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;a href=&quot;http://qt.nokia.com/products&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0000ff;&quot;&gt;Qt 4&lt;/span&gt;&lt;/a&gt; by Nokia&lt;/li&gt;
 &lt;li style=&quot; margin-top:12px; margin-bottom:12px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;a href=&quot;http://www.openexr.com/&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0000ff;&quot;&gt;OpenEXR&lt;/span&gt;&lt;/a&gt; by Industrial Light &amp;amp; Magic&lt;/li&gt;