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 * Copyright (c) 2005 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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#include "primitives/DirectionalAtom.hpp" | 
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namespace oopse { | 
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/**@todo still a lot left to improve*/ | 
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void GhostBend::calcForce() { | 
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  /**@todo still a lot left to improve*/ | 
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  void GhostBend::calcForce(double& angle) { | 
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    DirectionalAtom* ghostAtom = static_cast<DirectionalAtom*>(atom2_); | 
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    Vector3d pos1 = atom1_->getPos(); | 
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    //check roundoff      | 
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    if (cosTheta > 1.0) { | 
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        cosTheta = 1.0; | 
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      cosTheta = 1.0; | 
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    } else if (cosTheta < -1.0) { | 
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        cosTheta = -1.0; | 
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      cosTheta = -1.0; | 
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    } | 
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    double theta = acos(cosTheta); | 
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    double sinTheta = sqrt(1.0 - cosTheta * cosTheta); | 
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    if (fabs(sinTheta) < 1.0E-12) { | 
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        sinTheta = 1.0E-12; | 
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      sinTheta = 1.0E-12; | 
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    } | 
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    double commonFactor1 = -firstDerivative / sinTheta * d12inv; | 
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    /**@todo test correctness */ | 
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    ghostAtom->addTrq(cross(r32, force3) ); | 
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} | 
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    angle = theta /M_PI * 180.0; | 
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  } | 
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} //end namespace oopse | 
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