UE3:DecalManager (UDK)

Object >> Actor >> DecalManager

Package: 

Engine

Direct subclasses:

GameDecalManager, UTDecalManager

This class in other games:

UT3

Properties

ActiveDecals

Type: array<ActiveDecalInfo>

DecalBlendRange

Type: Object.Vector2D

default decal blend range

Default value:

Member	Value
X	89.5
Y	180.0

DecalDepthBias

Type: float

default depth bias offset

Default value: -6.0E-5

DecalLifeSpan

Type: float

Modifiers: globalconfig

default lifetime for decals

Default value: 30.0

DecalTemplate

Type: DecalComponent

Modifiers: protected

template to base pool components off of - should not be used for decals or attached to anything

Default value: DecalComponent'BaseDecal'

MaxActiveDecals

Type: int

maximum allowed active components - if this is greater than 0 and is exceeded, the oldest active decal is taken

PoolDecals

Type: array<DecalComponent>

components currently in the pool

Default values

Property	Value
CollisionType	COLLIDE_CustomDefault
TickGroup	TG_DuringAsyncWork

Subobjects

BaseDecal

Class: Engine.DecalComponent

Property	Value
bIgnoreOwnerHidden	True
ReplacementPrimitive	None

Structs

ActiveDecalInfo

Modifiers: native

components currently active in the world and how much longer they will be

DecalComponent Decal 

float LifetimeRemaining 

Functions

Static native functions

AreDynamicDecalsEnabled

native static final function bool AreDynamicDecalsEnabled ()

Other static functions

SetDecalParameters

static final function SetDecalParameters (DecalComponent TheDecal, MaterialInterface DecalMaterial, Object.Vector DecalLocation, Object.Rotator DecalOrientation, float Width, float Height, float Thickness, bool bNoClip, float DecalRotation, PrimitiveComponent HitComponent, bool bProjectOnTerrain, bool bProjectOnSkeletalMeshes, name HitBone, int HitNodeIndex, int HitLevelIndex, int InFracturedStaticMeshComponentIndex, float DepthBias, Object.Vector2D BlendRange)

This will set all of the various decal parameters. This is the function that should be updated when there are new Decal Paramaters that exist that should be updated by game code

Parameters:

• InExistingDecal - If you have an existing decal that you want to set all the params on.
• DecalMaterial - the material to use for the decal
• Width - decal width
• Height - decal height
• Thickness - decal thickness (used to calculate the nearplane/farplane values)
• bNoClip - if true, use the bNoClip code path for decal generation (requires DecalMaterial to have clamped texture coordinates)
• DecalRotation - rotation of the decal in degrees
• HitComponent - if specified, will only project on this component (optimization)
• bProjectOnTerrain - whether decal can project on skeletal meshes (default false)
• HitBone - if HitComponent is a skeletal mesh, the bone that was hit
• HitNodeIndex - if HitComponent is BSP, the node that was hit
• HitLevelIndex - if HitComponent is BSP, the index of the level whose BSP was hit
• InFracturedStaticMeshComponentIndex - The index of the FracturedMesh component. -1/INDEX_NONE if the decal should project onto both the shell and core of the FracturedMeshActor
• DepthBias - depth bias offset to control z-fighting
• BlendRange - Start/End blend range specified as an angle in degrees. Controls where to start blending out the decal on a surface

Events

DecalFinished

event DecalFinished (DecalComponent Decal)

Called when the given decal's lifetime has run out

Note: caller responsible for removing from ActiveDecals array (this is to prevent code iterating the array from having dependencies on this function)

Other instance functions

CanSpawnDecals

function bool CanSpawnDecals ()

Returns:

whether spawning decals is allowed right now

GetPooledComponent

protected function DecalComponent GetPooledComponent ()

Returns:

a decal from the pool, or a new one if the pool was empty

SpawnDecal

function DecalComponent SpawnDecal (MaterialInterface DecalMaterial, Object.Vector DecalLocation, Object.Rotator DecalOrientation, float Width, float Height, float Thickness, bool bNoClip, optional float DecalRotation, optional PrimitiveComponent HitComponent, optional bool bProjectOnTerrain, optional bool bProjectOnSkeletalMeshes, optional name HitBone, optional int HitNodeIndex, optional int HitLevelIndex, optional float InDecalLifeSpan, optional int InFracturedStaticMeshComponentIndex, optional float InDepthBias, optional Object.Vector2D InBlendRange)

Spawns a decal with the given parameters, taking a component from the pool or creating as necessary.

Parameters:

• DecalMaterial - the material to use for the decal
• Width - decal width
• Height - decal height
• Thickness - decal thickness (used to calculate the nearplane/farplane values)
• bNoClip - if true, use the bNoClip code path for decal generation (requires DecalMaterial to have clamped texture coordinates)
• DecalRotation - opt) rotation of the decal in degrees
• HitComponent - opt) if specified, will only project on this component (optimization)
• bProjectOnTerrain - opt) whether decal can project on skeletal meshes (default false)
• HitBone - opt) if HitComponent is a skeletal mesh, the bone that was hit
• HitNodeIndex - opt) if HitComponent is BSP, the node that was hit
• HitLevelIndex - opt) if HitComponent is BSP, the index of the level whose BSP was hit
• InDecalLifeSpan - lifetime for the decal
• InFracturedStaticMeshComponentIndex - The index of the FracturedMesh component. -1/INDEX_NONE if the decal should project onto both the shell and core of the FracturedMeshActor
• DepthBias - depth bias offset to control z-fighting
• BlendRange - Start/End blend range specified as an angle in degrees. Controls where to start blending out the decal on a surface

Returns:

the DecalComponent that will be used (may be None if dynamic decals are disabled)

Note: the component is returned so the caller can perform any additional modifications (parameters, etc), but it shouldn't keep the reference around as the component will be returned to the pool as soon as the lifetime runs out