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/* Copyright (c) 2008 The University of Notre Dame. All Rights Reserved. | 
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/* Copyright (c) 2008, 2010 The University of Notre Dame. All Rights Reserved. | 
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 * | 
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 * The University of Notre Dame grants you ("Licensee") a | 
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 * non-exclusive, royalty free, license to use, modify and | 
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 *  Created by Charles F. Vardeman II on 29 July 2008. | 
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 *  @author  Charles F. Vardeman II | 
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 *  @version $Id: Triangle.cpp,v 1.4 2009-11-25 20:02:01 gezelter Exp $ | 
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 *  @version $Id$ | 
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 */ | 
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using namespace OpenMD; | 
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Triangle::Triangle() : HaveNormal_(false), HaveCentroid_(false), | 
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Triangle::Triangle() : HaveNormal_(false), HaveUnitNormal_(false), HaveCentroid_(false), | 
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                       HaveArea_(false), area_(0.0), normal_(V3Zero),  | 
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                       centroid_(V3Zero), facetVelocity_(V3Zero), mass_(0.0), | 
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                       a_(V3Zero), b_(V3Zero), c_(V3Zero){ | 
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  area_ = getNormal().length() * 0.5; | 
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  return area_; | 
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} | 
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// This should return the normal for our calculations. | 
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Vector3d Triangle::computeNormal(){ | 
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  HaveNormal_ = true; | 
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  normal_ = cross(a_,b_); | 
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  return normal_; | 
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} | 
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// This should return the normal for our calculations. | 
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Vector3d Triangle::computeUnitNormal(){ | 
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  HaveUnitNormal_ = true; | 
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  unitnormal_ = cross(a_,b_); | 
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  unitnormal_.normalize(); | 
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  return unitnormal_; | 
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} | 
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Vector3d Triangle::computeCentroid(){ | 
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  HaveCentroid_ = true; |