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/* |
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/* |
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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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namespace oopse { |
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/**@todo still a lot left to improve*/ |
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void Bend::calcForce() { |
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/**@todo still a lot left to improve*/ |
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void Bend::calcForce(double& angle) { |
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Vector3d pos1 = atom1_->getPos(); |
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Vector3d pos2 = atom2_->getPos(); |
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Vector3d pos3 = atom3_->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 dVdTheta; |
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bendType_->calcForce(theta, potential_, dVdTheta); |
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//std::cout << atom1_->getType() << "\t" << atom2_->getType() << "\t" << atom3_->getType() << "\t"; |
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//std::cout << "theta = " << theta/M_PI * 180.0 <<", potential = " << potential_ << std::endl; |
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double sinTheta = sqrt(1.0 - cosTheta * cosTheta); |
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if (fabs(sinTheta) < 1.0E-6) { |
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sinTheta = 1.0E-6; |
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sinTheta = 1.0E-6; |
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} |
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double commonFactor1 = dVdTheta / sinTheta * d21inv; |
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atom1_->addFrc(force1); |
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atom2_->addFrc(force2); |
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atom3_->addFrc(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 |
