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# SpriteEmitter

UT2003 :: Object >> ParticleEmitter >> SpriteEmitter (Package: Engine)

Used in Emitters to spawn particle sprites. This all-around ParticleEmitter can be used to create smoke, fire, water falls, dust clouds and many other effects.

Some useful combinations of settings can be found in our ParticleEmitter cookbook.

## Properties

The SpriteEmitter class adds only one group to the ParticleEmitter properties.

### Sprite Group

vector ProjectionNormal
  Normal vector of the projection plane used when UseDirectionAs is set to PTDU_Normal, PTDU_UpAndNormal or PTDU_RightAndNormal.
EParticleDirectionUsage UseDirectionAs
  Here you can specify how the 2D image should be displayed. See EParticleDirectionUsage enum below for details.

## Enums

### EParticleDirectionUsage

PTDU_None
  Always rotates the sprite towards the viewer. The sprites will always look the same, no matter what direction they are viewed from. Size → UniformSize will be forced to True, so only the X component of Size → SizeScale can be used to scale the sprites.

UseDirectionAs = PTDU_None

PTDU_Up
  Also rotates the projection plane towards the viewer, but in a special way, so the particle's movement direction will always be in the projection plane.

UseDirectionAs = PTDU_Up

PTDU_Right
  Like PTDU_Up, but the particle texture is rotated 90°.

UseDirectionAs = PTDU_Right

PTDU_Forward
  The particle's particle's movement direction is used as the projection plane's normal vector.

UseDirectionAs = PTDU_Forward

PTDU_Normal
  The ProjectionNormal is used as the projection plane's normal.

UseDirectionAs = PTDU_Normal ProjectionNormal = (0.5, 1, 1)

PTDU_UpAndNormal
  This is similar to PTDU_Normal, but the particles can only be rotated around the axis given by the particles' movement direction.

UseDirectionAs = PTDU_UpAndNormal ProjectionNormal = (0.5, 1, 1)

PTDU_RightAndNormal
  Same as PTDU_UpAndNormal, but the texture is rotated 90°.

UseDirectionAs = PTDU_RightAndNormal ProjectionNormal = (0.5, 1, 1)

PTDU_Scale
  Like PTDU_None, but allowes you to turn off Size → UniformSize so the sprites can have different scaling values for X and Y.

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