Ellipsoid Particle Emitter
Manual     Reference     Scripting   
Reference Manual > Components > Particle Components > Ellipsoid Particle Emitter

Ellipsoid Particle Emitter

The Ellipsoid Particle Emitter spawns particles inside a sphere. Use the Ellipsoid property below to scale & stretch the sphere.

The Ellipsoid Particle Emitter Inspector


EmitIf enabled, the emitter will emit particles.
Min SizeThe minimum size each particle can be at the time when it is spawned.
Max SizeThe maximum size each particle can be at the time when it is spawned.
Min EnergyThe minimum lifetime of each particle, measured in seconds.
Max EnergyThe maximum lifetime of each particle, measured in seconds.
Min EmissionThe minimum number of particles that will be spawned every second.
Max EmissionThe maximum number of particles that will be spawned every second.
World VelocityThe starting speed of particles in world space, along X, Y, and Z.
Local VelocityThe starting speed of particles along X, Y, and Z, measured in the object's orientation.
Rnd VelocityA random speed along X, Y, and Z that is added to the velocity.
Emitter Velocity ScaleThe amount of the emitter's speed that the particles inherit.
Tangent VelocityThe starting speed of particles along X, Y, and Z, across the Emitter's surface.
Simulate In World SpaceIf enabled, the particles don't move when the emitter moves. If false, when you move the emitter, the particles follow it around.
One ShotIf enabled, the particle numbers specified by min & max emission is spawned all at once. If disabled, the particles are generated in a long stream.
EllipsoidScale of the sphere along X, Y, and Z that the particles are spawned inside.
MinEmitterRangeDetermines an empty area in the center of the sphere - use this to make particles appear on the edge of the sphere.


Ellipsoid Particle Emitters (EPEs) are the basic emitter, and are included when you choose to add a Particle System to your scene from Components->Particles->Particle System. You can define the boundaries for the particles to be spawned, and give the particles an initial velocity. From here, use the Particle Animator to manipulate how your particles will change over time to achieve interesting effects.

Particle Emitters work in conjunction with Particle Animators and Particle Renderers to create, manipulate, and display Particle Systems. All three Components must be present on an object before the particles will behave correctly. When particles are being emitted, all different velocities are added together to create the final velocity.

Spawning Properties

Spawning properties like Size, Energy, Emission, and Velocity will give your particle system distinct personality when trying to achieve different effects. Having a small Size could simulate fireflies or stars in the sky. A large Size could simulate dust clouds in a musky old building.

Energy and Emission will control how long your particles remain onscreen and how many particles can appear at any one time. For example, a rocket might have high Emission to simulate density of smoke, and high Energy to simulate the slow dispersion of smoke into the air.

Velocity will control how your particles move. You might want to change your Velocity in scripting to achieve interesting effects, or if you want to simulate a constant effect like wind, set your X and Z Velocity to make your particles blow away.

Simulate in World Space

If this is disabled, the position of each individual particle will always translate relative to the Position of the emitter. When the emitter moves, the particles will move along with it. If you have Simulate in World Space enabled, particles will not be affected by the translation of the emitter. For example, if you have a fireball that is spurting flames that rise, the flames will be spawned and float up in space as the fireball gets further away. If Simulate in World Space is disabled, those same flames will move across the screen along with the fireball.

Emitter Velocity Scale

This property will only apply if Simulate in World Space is enabled.

If this property is set to 1, the particles will inherit the exact translation of the emitter at the time they are spawned. If it is set to 2, the particles will inherit double the emitter's translation when they are spawned. 3 is triple the translation, etc.

One Shot

One Shot emitters will create all particles within the Emission property all at once, and cease to emit particles over time. Here are some examples of different particle system uses with One Shot Enabled or Disabled:



Min Emitter Range

The Min Emitter Range determines the depth within the ellipsoid that particles can be spawned. Setting it to 0 will allow particles to spawn anywhere from the center core of the ellipsoid to the outer-most range. Setting it to 1 will restrict spawn locations to the outer-most range of the ellipsoid.

Min Emitter Range of 0

Min Emitter Range of 1


Page last updated: 2007-09-17