SimulationLOD in Mass Framework

SimulationLOD with MassGameplay built-in resources

• SimulationLOD Trait

  • Built-in MassGameplay.
  • Trait located At UE5/Engine/Plugins/Runtime/MassGameplay/Source/MassLOD.
  • SimulationLOD trait shares the same Trait file with LODCollector.
  Image

  .h

  .cpp

  void UMassSimulationLODTrait::BuildTemplate(FMassEntityTemplateBuildContext& BuildContext, const UWorld& World) const
  {
  	BuildContext.RequireFragment<FMassViewerInfoFragment>();
  	BuildContext.RequireFragment<FTransformFragment>();
  
  	FMassSimulationLODFragment& LODFragment = BuildContext.AddFragment_GetRef<FMassSimulationLODFragment>();
  
  	// Start all simulation LOD in the Off 
  	if(Params.bSetLODTags || bEnableVariableTicking)
  	{
  		LODFragment.LOD = EMassLOD::Off;
  		BuildContext.AddTag<FMassOffLODTag>();
  	}
  
  	FMassEntityManager& EntityManager = UE::Mass::Utils::GetEntityManagerChecked(World);
  
  	FConstSharedStruct ParamsFragment = EntityManager.GetOrCreateConstSharedFragment(Params);
  	BuildContext.AddConstSharedFragment(ParamsFragment);
  
  	uint32 ParamsHash = UE::StructUtils::GetStructCrc32(FConstStructView::Make(Params));
  	FSharedStruct SharedFragment = EntityManager.GetOrCreateSharedFragmentByHash<FMassSimulationLODSharedFragment>(ParamsHash, Params);
  	BuildContext.AddSharedFragment(SharedFragment);
  	// Variable ticking from simulation LOD
  	if(bEnableVariableTicking)
  	{
  		BuildContext.AddFragment<FMassSimulationVariableTickFragment>();
  		BuildContext.AddChunkFragment<FMassSimulationVariableTickChunkFragment>();
  
  		FConstSharedStruct VariableTickParamsFragment = EntityManager.GetOrCreateConstSharedFragment(VariableTickParams);
  		BuildContext.AddConstSharedFragment(VariableTickParamsFragment);
  
  		uint32 VariableTickParamsHash = UE::StructUtils::GetStructCrc32(FConstStructView::Make(VariableTickParams));
  		FSharedStruct VariableTickSharedFragment = EntityManager.GetOrCreateSharedFragmentByHash<FMassSimulationVariableTickSharedFragment>(VariableTickParamsHash, VariableTickParams);
  		BuildContext.AddSharedFragment(VariableTickSharedFragment);
  	}
  }