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double m_res = 0.0;
		int numIter = 0;
		do{
 
			Vector3d negGradient = -m_rbf->evalGrad(pEigen);
			//negGradient.normalize();
			pEigen += (m_step * negGradient);
			m_res = abs(m_rbf->eval(pEigen));
			numIter++;
		}while (m_res > m_eps && numIter < 50);