Version: 2017.1
Particle System modules
Emission module

Particle System Main module

The Particle System module contains global properties that affect the whole system. Most of these properties control the initial state of newly created particles. The main module is expanded by clicking the white icon button to the right of the inspector window.

The name of the module appears in the inspector as the name of the GameObject that the Particle System component is attached to.


Свойство: Функция:
Duration The length of time the system runs.
Looping If enabled, the system starts again at the end of its duration time and continues to repeat the cycle.
Prewarm If enabled, the system is initialized as though it had already completed a full cycle (only works if Looping is also enabled).
Start Delay Задержка в секундах до запуска системы излучения частиц после её включения.
Start Lifetime Начальная продолжительность жизни частиц.
Start Speed Начальная скорость каждой частицы в соответствующем ей направлении.
3D Start Size Enable this if you want to control the size of each axis separately.
Start Size Начальный размер каждой частицы.
3D Start Rotation Enable this if you want to control the rotation of each axis separately.
Start Rotation Начальный угол поворота каждой частицы.
Randomize Rotation Direction Начальная скорость каждой частицы в соответствующем ей направлении.
Start Color Начальный цвет каждой частицы.
Gravity Modifier Масштабирование значения гравитации в менеджере физики (physics manager). Значение равное 0 приведёт к отключению гравитации.
Simulation Space Controls whether particles are animated in the parent object’s local space (therefore moving with the parent object), in the world space, or relative to a custom object (moving with a custom object of your choosing).
Simulation Speed Adjust the speed at which the entire system updates.
Delta Time Choose between Scaled and Unscaled, where Scaled will use the Time Scale value in the Time Manager, and Unscaled will ignore it. This is useful for Particle Systems that appear on a Pause Menu, for example.
Scaling Mode Choose how to use the scale from the transform. Set to Hierarchy, Local or Shape. Local applies only the Particle System transform scale, ignoring any parents. Shape mode applies the scale to the start positions of the particles, but does not affect their size.
Play on Awake If enabled, the Particle System starts automatically when the object is created.
Max Particles The maximum number of particles in the system at once. If the limit is reached, some particles will be removed.
Auto Random Seed If enabled, the Particle System will look different each time it is played. When set to false, the system will be exactly the same every time it is played.
Random Seed When disabling the automatic random seed, this value is used to create a unique repeatable effect.

Property details

The system emits particles for a specific duration, and can be set to emit continuously using the Looped property. This allows you to set particles to be emitted intermittently or continuously; for example, an object may emit smoke in short puffs or in a steady stream.

The Start properties (lifetime, speed, size, rotation and color) specify the state of a particle on emission. You can specify a particle’s width, height and depth independently, using the 3D Start Size property (see Non-uniform particle scaling, below).

All Particle Systems use the same gravity vector specified in the Physics settings. The Gravity Multiplier value can be used to scale the gravity, or switch it off if set to zero.

The Simulation Space property determines whether the particles move with the Particle System parent object, a custom object, or independently in the game world. For example, systems like clouds, hoses and flamethrowers will need to be set independently of their parent object, as they tend to leave trails that persist in the world space even if the object producing them moves around. On the other hand, if particles are used to create a spark between two electrodes, the particles should move along with the parent object. For more advanced control over how particles follow their Transform, see documentation on the Inherit Velocity module.

Non-uniform particle scaling

The 3D Start Size property allows you to specify a particle’s width, height and depth independently. In the Particle System Main module, check the 3D Start Size checkbox, and enter the values for the initial x (width), y (height) and z (depth) of the particle. Note that z (depth) only applies to 3D Mesh particles. You can also set randomised values for these properties, in a range between two constants or curves.

You can set the particle’s initial size in the Particle System Main module, and its size over the particle’s lifetime using the Separate Axes option in the Size over Lifetime module. You can also set the particle’s size in relation to its speed using the Separate Axes option in the Size by Speed module.

  • 2017–05–31 Page amended with editorial review

  • Simulation Speed and Delta Time added in Unity 2017.1 NewIn20171

Particle System modules
Emission module
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