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API > API/Runtime > API/Runtime/Chaos > API/Runtime/Chaos/Chaos > API/Runtime/Chaos/Chaos/TPBDRigidClusteredParticles > API/Runtime/Chaos/Chaos/TPBDRigidClusteredParticles/ClusterGroupIndex
References
| Module | Chaos |
| Header | /Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/PBDRigidClusteredParticles.h |
| Include | #include "Chaos/PBDRigidClusteredParticles.h" |
auto & ClusterGroupIndex
&40;
int32 Idx
&41;