1. Epic GamesDeveloper
  3. UParticleSystem

UParticleSystem

A ParticleSystem is a complete particle effect that contains any number of ParticleEmitters.

API > API/Runtime > API/Runtime/Engine > API/Runtime/Engine/Particles

Inheritance Hierarchy

References

   
Module Engine
Header /Engine/Source/Runtime/Engine/Classes/Particles/ParticleSystem.h
Include #include "Particles/ParticleSystem.h"

Syntax

class UParticleSystem : public UFXSystemAsset

Remarks

A ParticleSystem is a complete particle effect that contains any number of ParticleEmitters. By allowing multiple emitters in a system, the designer can create elaborate particle effects that are held in a single system. Once created using Cascade, a ParticleSystem can then be inserted into a level or created in script.

Variables

  Type Name Description
Public variable FColor BackgroundColor The background color to display in Cascade
Public variable uint8: 1 bAllowManagedTicking  
Public variable uint8: 1 bAutoDeactivate  
Public variable uint8: 1 bHasPhysics Set during load time to indicate that physics is used...
Public variable uint8: 1 bOrientZAxisTowardCamera If true, the system's Z axis will be oriented toward the camera
Public variable uint8: 1 bRegenerateLODDuplicate Internal value that tracks the regenerate LOD levels preference.
Public variable uint8: 1 bShouldResetPeakCounts EDITOR ONLY: Indicates that Cascade would like to have the PeakActiveParticles count reset
Public variable uint8: 1 bUseDelayRange If true, select the emitter delay from the range [DelayLow..Delay]
Public variable uint8: 1 bUseFixedRelativeBoundingBox Whether to use the fixed relative bounding box or calculate it every frame.
Public variable uint8: 1 bUseRealtimeThumbnail Inidicates the old 'real-time' thumbnail rendering should be used
Public variable TObjectPtr< UInterpCurveEdSetup > CurveEdSetup Used for curve editor to remember curve-editing setup.
Public variable FBox CustomOcclusionBounds The occlusion bounds to use if OcclusionBoundsMethod is set to EPSOBM_CustomBounds
Public variable float Delay How long this Particle system should delay when ActivateSystem is called on it.
Public variable float DelayLow The low end of the emitter delay if using a range.
Public variable int32 EditorLODSetting LOD setting for intepolation (set by Cascade) Range [0..100]
Public variable TArray< TObjectPtr< UParticleEmitter > > Emitters Emitters - internal - the array of emitters in the system
Public variable FBox FixedRelativeBoundingBox Fixed relative bounding box for particle system.
Public variable FString FloorMesh Cascade 'floor' mesh information.
Public variable FVector FloorPosition  
Public variable FRotator FloorRotation  
Public variable float FloorScale  
Public variable FVector FloorScale3D  
Public variable float InsignificanceDelay Time delay between all emitters becoming insignificant and the systems insignificant reaction.
Public variable EParticleSystemInsignificanceReaction InsignificantReaction The reaction this system takes when all emitters are insignificant.
Public variable float LODDistanceCheckTime LOD How often (in seconds) the system should perform the LOD distance check.
Public variable TArray< float > LODDistances The array of distances for each LOD level in the system.
Public variable TEnumAsByte< enum ParticleSystemLODMethod > LODMethod The method of LOD level determination to utilize for this particle system PARTICLESYSTEMLODMETHOD_Automatic - Automatically set the LOD level, checking every LODDistanceCheckTime seconds.
Public variable TArray< FParticleSystemLOD > LODSettings  
Public variable FVector MacroUVPosition Local space position that UVs generated with the ParticleMacroUV material node will be centered on.
Public variable float MacroUVRadius World space radius that UVs generated with the ParticleMacroUV material node will tile based on.
Public variable EParticleSignificanceLevel MaxSignificanceLevel The maximum level of significance for emitters in this system.
Public variable uint32 MinTimeBetweenTicks  
Public variable TArray< FNamedEmitterMaterial > NamedMaterialSlots Array of named material slots for use by emitters of this system.
Public variable TEnumAsByte< enum EParticleSystemOcclusionBoundsMethod > OcclusionBoundsMethod Which occlusion bounds method to use for this particle system.
Public variable TObjectPtr< UParticleSystemComponent > PreviewComponent The component used to preview the particle system in Cascade
Public variable float SecondsBeforeInactive Number of seconds of emitter not being rendered that need to pass before it no longer gets ticked/ becomes inactive.
Public variable TArray< struct FLODSoloTrack > SoloTracking  
Public variable TEnumAsByte< enum EParticleSystemUpdateMode > SystemUpdateMode  
Public variable FRotator ThumbnailAngle The angle to use when rendering the thumbnail image
Public variable float ThumbnailDistance The distance to place the system when rendering the thumbnail image
Public variable TObjectPtr< class UTexture2D > ThumbnailImage Internal: The PSys thumbnail image
Public variable uint8: 1 ThumbnailImageOutOfDate Internal: Indicates the PSys thumbnail image is out of date
Public variable float ThumbnailWarmup The time to warm-up the system for the thumbnail image
Public variable float UpdateTime_Delta UpdateTime_Delta - internal
Public variable float UpdateTime_FPS UpdateTime_FPS - the frame per second to update at in FixedTime mode
Public variable float WarmupTickRate WarmupTickRate - the time step for each tick during warm up.
Public variable float WarmupTime WarmupTime - the time to warm-up the particle system when first rendered Warning: WarmupTime is implemented by simulating the particle system for the time requested upon activation.

Constructors

  Type Name Description
Public function    
Public function  

UParticleSystem ( const FObjectInitializer& ObjectInitializer
)

  

Functions

  Type Name Description
Public function Const bool  
Public function void Builds all emitters in the particle system.
Public function Virtual bool CalculateMaxActiveParticleCounts Determine the maximum active particles that could occur with each emitter.
Public function Const bool  
Public function bool Return true if this psys can tick in any thread
Public function void Decide if this psys can tick in any thread, and set bIsElligibleForAsyncTick
Public function bool

ContainsEmitterType ( UClass* TypeData
)

 Returns true if this system contains an emitter of the pasesd type.
Public function Const bool

DoesAnyEmitterHaveMotionBlur ( int32 LODLevelIndex
)

 Checks if any of the emitters have motion blur at a specific lod level.
Public function Virtual enum ParticleSystemLODMethod Return the currently set LOD method
Public function Const EParticleSignificanceLevel  
Public function Virtual float

GetLODDistance ( int32 LODLevelIndex
)

 Return the distance for the given LOD level
Public function Virtual int32 Return the number of LOD levels for this particle system
Public function Const EParticleSignificanceLevel  
Public function void

GetParametersUtilized ( TArray< TArray< FString > >& ParticleSysParamList,
TArray< TArray< FString > >& ParticleParameterList
)

 Retrieve the parameters associated with this particle system.
Public function Const bool Returns true if this system contains any GPU emitters.
Public function Const bool  
Public function Const bool Returns true if the particle system is looping (contains one or more looping emitters)
Public function void  
Public function bool

RemoveAllDuplicateModules ( bool bInMarkForCooker,
TMap< UObject*, bool >* OutRemovedModules
)

 Remove all duplicate modules.
Public function Virtual void

SetCurrentLODMethod ( ParticleSystemLODMethod InMethod
)

 Set the LOD method
Public function void

SetDelay ( float InDelay
)

 Set the time to delay spawning the particle system
Public function Virtual bool

SetLODDistance ( int32 LODLevelIndex,
float InDistance
)

 Set the distance for the given LOD index
Public function void Editor helper function for setting the LOD validity flags used in Cascade.
Public function void Setup the soloing information... Obliterates all current soloing.
Public function Const bool  
Public function bool Toggle the bIsSoloing flag on the given emitter.
Public function bool Turn soloing off completely - on every emitter
Public function void Update all emitter module lists
Public function void  
Public function Const bool  
Public function Const bool  

Overridden from UObject

  Type Name Description
Public function Virtual Const void Gathers a list of asset registry searchable tags which are name/value pairs with some type information This only needs to be implemented for asset objects
Public function Virtual Const bool Called during async load to determine if PostLoad can be called on the loading thread.
Public function Virtual void

PostEditChangeProperty ( FPropertyChangedEvent& PropertyChangedEvent
)

 Called when a property on this object has been modified externally
Public function Virtual void Do any object-specific cleanup required immediately after loading an object.
Public function Virtual void

PreSave ( FObjectPreSaveContext SaveContext
)

 Presave function.
Public function Virtual void Handles reading, writing, and reference collecting using FArchive.

Overridden from UObjectBaseUtility

  Type Name Description
Public function Virtual Const bool Called after load to determine if the object can be a cluster root

Deprecated Functions

  Type Name Description
Public function Virtual PRAGMA_DISABLE_DEPRECATION_WARNINGSvoid

PreSave ( const ITargetPlatform* TargetPlatform
)

 Use version that takes FObjectPreSaveContext instead.

Ask questions and help your peers Developer Forums

Write your own tutorials or read those from others Learning Library

On this page