Particle Renderer
Reference Manual > Components > Particle Components > Particle Renderer

Particle Renderer

The Particle Renderer renders the Particle System on screen.


The Particle Renderer Inspector

Properties

MaterialsReference to a list of Materials that will be displayed in the position of each individual particle.
Camera Velocity ScaleThe amount of stretching that is applied to the Particles based on Camera movement.
Stretch ParticlesDetermines how the particles are rendered.
BillboardThe particles are rendered as if facing the camera.
StretchedThe particles are facing the direction they are moving.
SortedBillboardThe particles are sorted by depth. Use this when using a blending material.
VerticalBillboardAll particles are aligned flat along the X/Z axes.
HorizontalBillboardAll particles are aligned flat along the X/Y axes.
Length ScaleIf Stretch Particles is set to Stretched, this value determines how long the particles are in their direction of motion.
Velocity ScaleIf Stretch Particles is set to Stretched, this value determines the rate at which particles will be stretched, based on their movement speed.
UV AnimationIf either of these are set, the UV coordinates of the particles will be generated for use with a tile animated texture. See the section on Animated Textures below.
X TileNumber of frames located across the X axis.
Y TileNumber of frames located across the Y axis.
CyclesHow many times to loop the animation sequence.

Details

Particle Renderers are required for any Particle Systems to be displayed on the screen.


A Particle Renderer makes the Gunship's engine exhaust appear on the screen

Choosing a Material

When setting up a Particle Renderer it is very important to use an appropriate material and shader. Most of the time you want to use a Material with one of the built-in Particle Shaders. There are some premade materials in the Standard Assets->Particles->Sources folder.

Creating a new material is easy:

  1. Select Assets->Create Other->Material from the menu bar.
  2. The Material has a shader popup, choose one of the shaders in the Particles group. Eg. Particles->Multiply.
  3. Now assign a Texture. The different shaders use the alpha channel of the textures slightly differently, but most of the time a value of black will make it invisible and white in the alpha channel will display it on screen.

Distorting particles

By default particles are rendered billboarded. That is simple square sprites. This is good for smoke and explosions and most other particle effects.

Particles can be made to either stretch with the velocity. This is useful for sparks, lightning or laser beams. Length Scale and Velocity Scale affects how long the stretched particle will be.

Sorted Billboard can be used to make all particles sort by depth. Sometimes this is necessary, mostly when using Alpha Blended particle shaders. This can be expensive and should only be used if it really makes a quality difference when rendering.

Animated textures

Particle Systems can be rendered with an animated tile texture. To use this feature, make the texture out of a grid of images. As the particles go through their life cycle, they will cycle through the images. This is good for adding more life to your particles, or making small rotating debris pieces.

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