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diff --git a/tests/bullet/Extras/ConvexDecomposition/concavity.h b/tests/bullet/Extras/ConvexDecomposition/concavity.h
new file mode 100644
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+++ b/tests/bullet/Extras/ConvexDecomposition/concavity.h
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+#ifndef COMPUTE_CONCAVITY_H
+
+#define COMPUTE_CONCAVITY_H
+
+/*----------------------------------------------------------------------
+		Copyright (c) 2004 Open Dynamics Framework Group
+					www.physicstools.org
+		All rights reserved.
+
+		Redistribution and use in source and binary forms, with or without modification, are permitted provided
+		that the following conditions are met:
+
+		Redistributions of source code must retain the above copyright notice, this list of conditions
+		and the following disclaimer.
+
+		Redistributions in binary form must reproduce the above copyright notice,
+		this list of conditions and the following disclaimer in the documentation
+		and/or other materials provided with the distribution.
+
+		Neither the name of the Open Dynamics Framework Group nor the names of its contributors may
+		be used to endorse or promote products derived from this software without specific prior written permission.
+
+		THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+		INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+		DISCLAIMED. IN NO EVENT SHALL THE INTEL OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+		EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+		LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+		IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+		THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+-----------------------------------------------------------------------*/
+
+// http://codesuppository.blogspot.com
+//
+// mailto: jratcliff@infiniplex.net
+//
+// http://www.amillionpixels.us
+//
+
+
+
+namespace ConvexDecomposition
+{
+
+class ConvexDecompInterface;
+
+// compute's how 'concave' this object is and returns the total volume of the
+// convex hull as well as the volume of the 'concavity' which was found.
+float computeConcavity(unsigned int vcount,
+                       const float *vertices,
+                       unsigned int tcount,
+                       const unsigned int *indices,
+                       ConvexDecompInterface *callback,
+                       float *plane,
+                       float &volume);
+
+
+}
+
+
+#endif