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Write a new system
Updated: Oct 16, 2024
Overview
The core of Spatial SDK’s computation is its components. Systems function every tick, typically involving one or more entity queries and modifications to component data.
Steps
To construct a new system, follow these steps:
- Begin by defining your class. Spatial SDK Systems utilize
com.meta.spatial.core.System. The header should be as follows:class UpAndDownSystem() : SystemBase() { - Override the execute function. This function operates every tick, and you’ll use it for the operations you wish to perform:
override fun execute() {The following steps outline an example where specific entities are queried and caused to move upward until a certain point, at which they return to their initial location in a continuous loop. - Create a query to pull data from the data model. The following query examines all entities with an
UpAndDowncomponent and aTransform:val q = Query.where { has(UpAndDown.id, Transform.id) } for (entity in q.eval()) { - Run an operation on the entity to change the data and establish the new component:
for (entity in q.eval()) { // the line from earlier val transform = entity.getComponent<Transform>() transform.transform.t.y += (0.2f) transform.transform.t.y %= 1 entity.setComponent(transform) } - The entire system construction process is combined as follows:
//UpAndDownSystem.kt class UpAndDownSystem() : SystemBase() { override fun execute() { val q = Query.where { has(UpAndDown.id, Transform.id) } for (entity in q.eval()) { val transform = entity.getComponent<Transform>() transform.transform.t.y += (0.2f) transform.transform.t.y %= 1 entity.setComponent(transform) } } } - Register your system.
//MyActivity.kt systemManager.registerSystem(UpAndDownSystem()) - Your code will run the execute function every tick.
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