class BaseForceField
!!!186160.cpp!!!	addMBKdx(in dfId : MultiVecDerivId, in mparams : MechanicalParams) : void
    if (mparams->kFactor() != 0.0 || mparams->bFactor() != 0.0)
	addDForce(dfId, mparams);
!!!186672.cpp!!!	addMBKToMatrix(in matrix : MultiMatrixAccessor, in mparams : MechanicalParams) : void
    if (mparams->kFactor() != 0.0)
        addKToMatrix(matrix, mparams);
    if (mparams->bFactor() != 0.0)
        addBToMatrix(matrix, mparams);
