Raycast Interactions

The raycast interaction module allows users to point and select objects at a distance using a visual ray and pointer. It provides hover events and fires actions with ButtonX, based on tag-filtered raycasts.

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Overview

• Draws a ray from the controller to visualize potential interactable targets.
• Detects hover enter/exit based on the selectableTag and fires HoverEnterEvent/HoverExitEvent.
• Fires a selection event when ButtonX is pressed on a hit collider with a NetworkTrigger.

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Requirements

• Unity 2022.3 LTS or later
• New Input System (for reading LeftTrigger, LeftGrip, ButtonX)
• XR Interaction Toolkit (for controller tracking)
• HoloMIT Core & EventManager (for NetworkTrigger and hover events)
• InteractionRaycast prefab placed under your player rig

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Setup

1. Place InteractionController
   • Add the InteractionRaycast Prefab component to your player.

2. Configure the Component
   • On the InteractionController component, assign:

• lineSelectableMat / lineNotSelectableMat for valid/invalid targets
• References to LineRenderer and targetMarker for visuals
• leftHand transform (if not auto-detected)
• maxDistance and raycastLayers to define range and layers

1. Enable Input Actions
   • InteractionController uses the HoloMITControls asset for trigger and ButtonX bindings.

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Usage

• Activate Ray: Hold the left trigger to enable the ray and marker.

• Select: Press ButtonX while pointing at a valid object; its NetworkeTrigger will fire.
• Cleanup: Release the trigger to hide the ray and marker.

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Known Limitations

• Configured only for the left hand by default; extend to both hands if needed.
• No smoothing transitions; the ray appears/disappears instantly.
• Relies on Unity physics and tags; ensure accurate collider and tag setup.
• Does not support drag operations out of the box; additional logic required.

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