FPBDSphericalBackstopConstraint ( const int32 InParticleOffset, const int32 InParticleCount, const TArray< FSolverVec3 >& InAnimationPositions, const TArray< FSolverVec3 >& InAnimationNormals, const TConstArrayView< FRealSingle >& InSphereRadii, const TConstArrayView< FRealSingle >& InSphereOffsetDistances, const bool bInUseLegacyBackstop )