50 lines
2.8 KiB
Markdown
50 lines
2.8 KiB
Markdown
# Systems
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A System refers to one or many [Contexts](Contexts.md) that define a standalone part of a visual effect. A System can be a Particle System, a Particle Strip System, a Mesh, or a Spawn machine. In the graph view, a System draws a dashed line box around the Contexts that it consists of.
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Multiple Systems can interact with each other within a Visual Effect Graph:
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* A **Spawn** System can **spawn particles** in one or many Particle Systems. This is the main method for spawning particles.
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* **Particle Systems** can use GPU Events to **spawn particles** in **other particle systems**. This alternate method can spawn particles from other particles based on simulation events such as the death of particle.
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* A **Spawn** System can **enable and disable** other **Spawn Systems**. This allows you to use a master Spawn System that manages other Spawn Systems to synchronize particle emission.
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## Creating System from templates
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The Visual Effect Graph comes with pre-built System templates that you can add to your graph. To create a System from a template:
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1. Right Click in an empty space of your workspace and select **Create Node**.
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2. In The menu, select **System**.
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3. Select a template from the list.
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## System simulation spaces
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Some Systems use a simulation space property to define the reference space that it uses to simulate its contents:
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* **Local space** Systems simulate the effect locally to the GameObject that holds the [Visual Effect component](VisualEffectComponent.md).
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* **World space** Systems simulate the effect independently of the GameObject that holds the [Visual Effect component](VisualEffectComponent.md).
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Regardless of the System's simulation space, you can use [Spaceable Properties](Properties.md#spaceable-properties) to access Local or World Values.
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### Setting a System simulation space
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A System displays its simulation space in the top-right corner of each Context it consists of. This is the System's **simulation space identifier**. If a Context does not use process anything that depends on simulation space, it does not display the simulation space identifier.
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To change the simulation space for a System, click the System's simulation space identifier to cycle through the compatible spaces.
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### Simulation space identifiers in Properties
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Some [Spaceable Properties](Properties.md) display a smaller version of the simulation space identifier. This does not change the System's simulation space, but instead allows you to express a value in a space that is different from the System's simulation space. For example, a System could simulate in world space but a Property could be a local position.
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