ComputeNegativeBackwardEulerResidual ( const FSolverParticles& InParticle..., const TArray< TArray< TVector< int3..., const TArray< FSolverReal >& Nodal..., const TArray< FSolverVec3 >& Vn, const FSolverParticles& Xn, Func1 P, Func2 AddExternalForce, const FSolverReal Time, const FSolverReal Dt, TArray< FSolverVec3 >& Residual )