11 lines
1.0 KiB
Markdown
11 lines
1.0 KiB
Markdown
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# Raycasters
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A Raycaster is a component that determines what objects are under a specific screen space position, such as the location of a mouse click or a touch. It works by projecting a ray from the screen into the scene and identifying objects that intersect with that ray. Raycasters are essential for detecting user interactions with UI elements, 2D objects, or 3D objects.
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Different types of Raycasters are used for different types of objects:
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- [Graphic Raycaster](script-GraphicRaycaster.md): Detects UI elements on a Canvas.
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- [Physics 2D Raycaster](script-Physics2DRaycaster.md): Detects 2D physics elements.
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- [Physics Raycaster](script-PhysicsRaycaster.md): Detects 3D physics elements.
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The Event System uses Raycasters to determine where to send input events. When a Raycaster is present and enabled in the scene, the Event System uses it to determine which object is closest to the screen at a given screen space position. If multiple Raycasters are active, the system will cast against all of them and sort the results by distance.
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