Particle Types

Particle types define the appearance and behavior of particles. In the object browser, they are always child nodes of particle emitters.

Particle renderers

There are three distinct types of particles, which determines how they are rendered.

Sprite particle

The sprite renderer renders each particle as a separate sprite.

Trail particle

The trail renderer generates continuous trails along the path of particles with the same parent particle. You can set details of the trail mesh generation in the additional settings next to the renderer property.

Mesh particle

The mesh renderer renders each particles as a three-dimensional mesh. You can change which mesh is used in the additional settings next to the renderer property.

Properties

The following properties can be adjusted in the property window to influence the look and behavior of the particles.

General

Property	Description
Lifespan	How long particles exist after being spawned by their emitter.
Lifespan variance	How much the lifespan varies between particles.
Number	How many particles of this type are spawned by the emitter.

Visual

Property	Description
Material	Material that particles use for rendering. The parameters of the active material can be accessed with . See particle materials for details.
Renderer	Which renderer is used for drawing the particles. Click to show additional options for each renderer.
Layer	Layer the particles are drawn on. Particles on upper layers occlude those on lower layers.
Color	Color of each particle over its lifetime, displayed as a color gradient. Double-click or right-click the color gradient to add another color. Double-clicking a color marker lets you choose its color, right-clicking removes it. To change the position of color markers, drag them around using the mouse.
Color variance	How much the color varies between particles.
Initial opacity	Opacity of each particle when created.
Opacity	Opacity of each particle over its lifetime as a fraction of its initial opacity.
Opacity variance	How much the opacity varies between particles.
Initial size	Size of each particle when created.
Size	Size of each particle over its lifetime as a fraction of its initial size.
Size variance	How much the size varies between particles.
Stretch	How much particles are stretched based on their speed.

Motion

Property	Description
Position	Motion path for particles. It is shown in the scene view if the property is selected.
Motion path force	How much particles are influenced by the motion path. Set to 0 to disable motion paths.
Initial velocity	How fast each particle is initially after being spawned by the emitter.
Inherited velocity	How much speed particles inherit from the parent particle or emitter.
Velocity variance	How much the speed varies between particles.
Acceleration	Linear acceleration applied to each particle over its lifetime. Positive values speed up particles, while negative values slow them down.
Radial acceleration	Acceleration of each particle towards the emitter over its lifetime. If you select negative values here, particles are repelled from the emitter.
Alignment mode	The direction to which particles are aligned: None: Particles do not align to anything. Camera: Particles always face the camera (3D). Motion: Particles align to their own velocity vector. Emission direction: Particles face their emitter. Emitter: Particles copy the rotation of their emitter.
Rotation mode	Whether the rotation property represents the exact rotation of particles or their angular velocity.
Initial rotation	Rotation of each particle when created, in degrees. For 3D effects, rotation is composed of roll, yaw and pitch.
Rotation	How particles rotate over time from their initial rotation.
Rotation variance	How much the rotation varies between particles.
Angular velocity variance	How much the angular velocity varies between particles.
Rotation by speed	How much particles rotate based on their velocity.
Pivot	Center of rotation, relative to the particle’s center.

Physics

Property	Description
Physical size	The relative size of particles for motion and collision calculations.
Weight	How strongly particles are affected by force fields.
Bounce	How much particles bounce back from colliders.
Friction	How resistant particles are to sliding down colliders.