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diff --git a/extern/solid/src/convex/DT_Accuracy.h b/extern/solid/src/convex/DT_Accuracy.h
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+/*
+ * SOLID - Software Library for Interference Detection
+ * 
+ * Copyright (C) 2001-2003  Dtecta.  All rights reserved.
+ *
+ * This library may be distributed under the terms of the Q Public License
+ * (QPL) as defined by Trolltech AS of Norway and appearing in the file
+ * LICENSE.QPL included in the packaging of this file.
+ *
+ * This library may be distributed and/or modified under the terms of the
+ * GNU General Public License (GPL) version 2 as published by the Free Software
+ * Foundation and appearing in the file LICENSE.GPL included in the
+ * packaging of this file.
+ *
+ * This library is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+ * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Commercial use or any other use of this library not covered by either 
+ * the QPL or the GPL requires an additional license from Dtecta. 
+ * Please contact info@dtecta.com for enquiries about the terms of commercial
+ * use of this library.
+ */
+
+#ifndef DT_ACCURACY_H
+#define DT_ACCURACY_H
+
+#include "MT_Scalar.h"
+
+class DT_Accuracy {
+public:
+	static MT_Scalar rel_error2; // squared relative error in the computed distance
+	static MT_Scalar depth_tolerance; // terminate EPA if upper_bound <= depth_tolerance * dist2
+	static MT_Scalar tol_error; // error tolerance if the distance is almost zero
+	
+	static void setAccuracy(MT_Scalar rel_error) 
+	{ 
+		rel_error2 = rel_error * rel_error;
+		depth_tolerance = MT_Scalar(1.0) + MT_Scalar(2.0) * rel_error;
+	}	
+   
+	static void setTolerance(MT_Scalar epsilon) 
+	{ 
+		tol_error = epsilon;
+	}
+};
+
+#endif