Initialize ( Softs::FPBDEvolution* InEvolution, const TArray< Softs::FSolverVec3 >& InAnimationPositions, const TArray< Softs::FSolverVec3 >& InOldAnimationPositions, const TArray< Softs::FSolverVec3 >& InAnimationNormals, int32 InParticleOffset, int32 InNumParticles )