Hi,
Better not rely on comments, it’s easy to miss fixing them when changing code.
DECLARE_DYNAMIC_MULTICAST_DELEGATE_NineParams( FParticleCollisionSignature, FName, EventName, float, EmitterTime, int32, ParticleTime, FVector, Location, FVector, Velocity, FVector, Direction, FVector, Normal, FName, BoneName, UPhysicalMaterial*, PhysMat);
In this case, you are missing the last parameter.
UPhysicalMaterial* PhysMat