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  Copyright 2014 Zhejiang University.
  All Rights Reserved.

  Permission to use, copy, modify and distribute this software and its
  documentation for educational, research and non-profit purposes, without
   fee, and without a written agreement is hereby granted, provided that the
  above copyright notice appear in all
  copies.

  The authors may be contacted via:

  EMail:   tang_m@zju.edu.cn


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/*************************************************************************\

  Copyright 2010 The University of North Carolina at Chapel Hill.
  All Rights Reserved.

  Permission to use, copy, modify and distribute this software and its
  documentation for educational, research and non-profit purposes, without
   fee, and without a written agreement is hereby granted, provided that the
  above copyright notice and the following three paragraphs appear in all
  copies.

  IN NO EVENT SHALL THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL BE
  LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR
  CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE
  USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY
  OF NORTH CAROLINA HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH
  DAMAGES.

  THE UNIVERSITY OF NORTH CAROLINA SPECIFICALLY DISCLAIM ANY
  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE
  PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
  NORTH CAROLINA HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT,
  UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

  The authors may be contacted via:

  US Mail:       GAMMA Research Group at UNC
                       Department of Computer Science
                       Sitterson Hall, CB #3175
                       University of N. Carolina
                       Chapel Hill, NC 27599-3175

  Phone:            (919)962-1749

  EMail:              geom@cs.unc.edu; tang_m@zju.edu.cn


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1. Usage:

The entry points for VF/EE tests are:

		bool
		Intersect_VF_robust(
				const Vec3d &a0, const Vec3d &b0, const Vec3d &c0, const Vec3d &d0,
				const Vec3d &a1, const Vec3d &b1, const Vec3d &c1, const Vec3d &d1)

and


		bool
		Intersect_EE_robust(
				const Vec3d &a0, const Vec3d &b0, const Vec3d &c0, const Vec3d &d0,
				const Vec3d &a1, const Vec3d &b1, const Vec3d &c1, const Vec3d &d1)


We are using the IntervalType/expansion classes of El Topo.
It can be downloaded from http://www.cs.ubc.ca/labs/imager/tr/2012/ExactContinuousCollisionDetection/exactccd.tar.gz

2. Reference:
Min Tang, Ruofeng Tong, Zhendong Wang, Dinesh Manocha, Fast and Exact Continuous Collision Detection with Bernstein Sign Classification, ACM Transactions on Graphics, 33(6), Article 186 (November 2014), 8 pages (Proc. of ACM SIGGRAPH Asia), 2014.

3. Bug Report:
We would be interested in knowing more about your application as well as any 
 bugs you may encounter when using the codes. You can
 report them by sending e-mail to geom@cs.unc.edu or tangm@cs.unc.edu