WebXR 输入源跟踪：掌握沉浸式体验的控制器状态管理

            xrSession.addEventListener('inputsourceschange', (event) => {
  console.log('Input sources changed:', event.added, event.removed);
});

xrSession.addEventListener('selectstart', (event) => {
  const inputSource = event.inputSource;
  console.log('Select started by input source:', inputSource);
  // Handle the start of a selection action
});

xrSession.addEventListener('selectend', (event) => {
  const inputSource = event.inputSource;
  console.log('Select ended by input source:', inputSource);
  // Handle the end of a selection action
});

            

              
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            function onXRFrame(time, frame) {
  const session = frame.session;
  const pose = frame.getViewerPose(xrReferenceSpace);

  if (pose) {
    for (const inputSource of session.inputSources) {
      if (inputSource && inputSource.gripSpace) {
        const inputPose = frame.getPose(inputSource.gripSpace, xrReferenceSpace);
        if (inputPose) {
          // Update the controller's visual representation
          updateController(inputSource, inputPose);

          //Check button states
          if (inputSource.gamepad) {
            handleGamepadInput(inputSource.gamepad);
          }
        }
      }
    }
  }
}

            

              
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            function updateController(inputSource, pose) {
  const position = pose.transform.position;
  const orientation = pose.transform.orientation;

  // Update the controller's visual representation in your scene
  controllerMesh.position.set(position.x, position.y, position.z);
  controllerMesh.quaternion.set(orientation.x, orientation.y, orientation.z, orientation.w);
}

            

              
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            function handleGamepadInput(gamepad) {
  for (let i = 0; i < gamepad.buttons.length; i++) {
    const button = gamepad.buttons[i];
    if (button.pressed) {
      // Button is currently pressed
      console.log(`Button ${i} is pressed`);
      // Perform an action based on the button pressed
      handleButtonPressed(i);
    }
  }

  for (let i = 0; i < gamepad.axes.length; i++) {
    const axisValue = gamepad.axes[i];
    // Axis value ranges from -1 to 1
    console.log(`Axis ${i} value: ${axisValue}`);
    // Use the axis value to control movement or other actions
    handleAxisMovement(i, axisValue);
  }
}

            

              
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            let previousButtonStates = [];
let previousAxisValues = [];

function handleGamepadInput(gamepad) {
  for (let i = 0; i < gamepad.buttons.length; i++) {
    const button = gamepad.buttons[i];
    const previousState = previousButtonStates[i] || { pressed: false };

    if (button.pressed && !previousState.pressed) {
      // Button was just pressed
      console.log(`Button ${i} was just pressed`);
      handleButtonPress(i);
    } else if (!button.pressed && previousState.pressed) {
      // Button was just released
      console.log(`Button ${i} was just released`);
      handleButtonRelease(i);
    }

    previousButtonStates[i] = { pressed: button.pressed };
  }

  for (let i = 0; i < gamepad.axes.length; i++) {
    const axisValue = gamepad.axes[i];
    const previousValue = previousAxisValues[i] || 0;

    if (Math.abs(axisValue - previousValue) > 0.1) { // Threshold for significant change
      // Axis value has changed significantly
      console.log(`Axis ${i} value changed to: ${axisValue}`);
      handleAxisChange(i, axisValue);
    }

    previousAxisValues[i] = axisValue;
  }
}

            

              
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            if (gamepad.vibrationActuator) {
  gamepad.vibrationActuator.playEffect('dual-rumble', {
    startDelay: 0,
    duration: 100,
    weakMagnitude: 0.5,
    strongMagnitude: 0.5
  });
}

            

              
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            // Example using three.js
const raycaster = new THREE.Raycaster();
const tempMatrix = new THREE.Matrix4();

tempMatrix.identity().extractRotation( controllerMesh.matrixWorld );
raycaster.ray.origin.setFromMatrixPosition( controllerMesh.matrixWorld );
raycaster.ray.direction.set( 0, 0, - 1 ).applyMatrix4( tempMatrix );

const intersects = raycaster.intersectObjects( scene.children );

if ( intersects.length > 0 ) {

  // User is pointing at an object
  const intersectedObject = intersects[ 0 ].object;
  //Do something with the intersected object

}

            

              
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            navigator.xr.requestSession('immersive-vr', {
  requiredFeatures: ['hand-tracking']
}).then((session) => {
  // ...
});

            

              
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            function onXRFrame(time, frame) {
  const session = frame.session;

  for (const inputSource of session.inputSources) {
    if (inputSource.hand) {
      for (let i = 0; i < inputSource.hand.length; i++) {
        const joint = inputSource.hand[i];
        const jointPose = frame.getPose(joint, xrReferenceSpace);

        if (jointPose) {
          // Update the joint's visual representation
          updateJoint(i, jointPose);
        }
      }
    }
  }
}

            

              
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