Inputs

XRInput

The XRInput object available at core.input provides access to controllers and raycasting results. Intersection results can be queries using the intersectionsForController property which maps controllers to raycast results. Raycast results are automatically updated when the controller begins selecting.

For example, to detect which item is selected:

export class ItemSelectionScript extends xb.Script {
  onSelectStart(event) {
    const controller = event.target;
    const intersections = xb.core.input.intersectionsForController(controller);
    if (intersections.length > 0) {
        console.log("Item selected:", intersections[0].object);
    }
  }
}

When a controller begins selecting, XRInput also sets controller.userData.selected to true. This can be used to loop over controllers which are selecting. For example:

export class ItemSelectionScript extends xb.Script {
  update() {
    const controllers = xb.core.input.controllers;
    for (const controller of controllers) {
      if (controller.userData.selected) {
          handleController(controller);
      }
    }
  }
}

Controllers

XR Blocks currently includes the following controllers:

• WebXR input sources - this includes hand and controllers in Android XR.
• MouseController - this becomes enabled in the simulator when User Mode is active.
• GazeController - this controller represents the center of the screen in Android XR.