Particle Emitters

There are a large number of particle emitters, each categorized by the volume of space they represent. Additionally, all emitters have three modes: explicit, radiate, and custom. Explicit mode emits the particles in parallel in the same direction. Radiate mode emits particles away from a specific point. Custom mode emits particles with a velocity determined by the particular emitter. All emitters have a number of common parameters.

Variable	Definition	Values
emissionType	Emission mode	ET_EXPLICIT, ET_RADIATE, ET_CUSTOM
explicitLaunchVector	Initial velocity in explicit mode	(x, y, z)
radiateOrigin	Point particles launch away from in radiate mode	(x, y, z)
amplitude	Launch velocity multiplier	(-infinity, infinity)
amplitudeSpeed	Spread for launch velocity multiplier	[0, infinity)

The following list contains the different types of emitters, their unique parameters, and the effect of the custom mode.

BoxEmitter

Variable	Definition	Values
minBound	Minimum point for box volume	(x, y, z)
maxBound	Maximum point for box volume	(x, y, z)

Custom mode generates particles with no initial velocity.

DiscEmitter

Variable	Definition	Values
radius	Radius of disc	[0, infinity)
outerAngle	Particle launch angle at edge of disc	[0, 360]
innterAngle	Particle launch angle at center of disc	[0, 360]
outerMagnitude	Launch velocity multiplier at edge of disc	(-infinity, infinity)
innerMagnitude	Launch velocity multiplier at center of disc	(-infinity, infinity)
cubicLerping	Whether or not magnitude/angle interpolation is cubic	Boolean

Custom mode uses the last five parameters. Particles emitted from areas on the inside use interpolated magnitudes and angles, either liner or cubic.

PointEmitter

Variable	Definition	Values
location	Location of outer point	(x, y, z)

Custom mode generates particles with no initial velocity.

RectangleEmitter

Variable	Definition	Values
minBound	2D point defining the rectangle	(x, z)
maxBound	2D point defining the rectangle	(x, z)

Custom mode generates particles with no initial velocity.

RingEmitter

Variable	Definition	Values
radius	Radius of disc	[0, infinity)
angle	Particle launch angle	[0, 360]

Custom mode uses the second parameter to emit particles at an angle with respect to the vector from the ring center to the spawn point. 0 degrees emits particles away from the center, and 180 degrees emits particles into the center.

SphereSurfaceEmitter

Variable	Definition	Values
radius	Radius of sphere	[0, infinity)

Custom mode generates particles with no initial velocity.

SphereVolumeEmitter

Variable	Definition	Values
radius	Radius of sphere	[0, infinity)

Custom mode emits particles away from the sphere center. Their velocity is dependent on their spawn location within the sphere. It is 0 at the center, of magnitude 1 at the outer edge of the sphere, and linearly interpolated in between.

TangentRingEmitter

Variable	Definition	Values
radius	Radius of ring	[0, infinity)

Custom mode emits particles tangentially to the ring edge, with a velocity magnitude of 1.