[TArray](API\Runtime\Core\Containers\TArray)< [FPBDRigidClusteredParticleHandle](API\Runtime\Chaos\Chaos\FPBDRigidClusteredParticleHandle) * > CreateClusteredParticles ( int32 NumParticles, const [FUniqueIdx](API\Runtime\Chaos\Chaos\FUniqueIdx) * ExistingIndices, const [FPBDRigidParticleParameters](API\Runtime\Chaos\Chaos\FPBDRigidParticleParameters) & Params )