private void InitializeVarjo()
{
if (!VarjoEyeTracking.IsGazeCalibrated())
{
Debug.LogError("Varjo ET is not calibrated; no ET data will be available.");
}
}
private void Start()
{
//Hiding the gazetarget if gaze is not available or if the gaze calibration is not done
if (VarjoEyeTracking.IsGazeAllowed() && VarjoEyeTracking.IsGazeCalibrated())
{
gazeTarget.SetActive(true);
}
else
{
gazeTarget.SetActive(false);
}
if (showFixationPoint)
{
fixationPointTransform.gameObject.SetActive(true);
}
else
{
fixationPointTransform.gameObject.SetActive(false);
}
}
void Update()
{
//Requesting gaze calibration with default settings
if (Input.GetKeyDown(calibrationRequestKey))
{
VarjoEyeTracking.RequestGazeCalibration(gazeCalibrationMode, gazeFilterMode);
}
if (Input.GetKeyDown(checkGazeAllowed))// Check if gaze is allowed
{
Debug.Log("Gaze allowed: " + VarjoEyeTracking.IsGazeAllowed());
}
else if (Input.GetKeyDown(checkGazeCalibrated)) // Check if gaze calibration is done
{
Debug.Log("Gaze calibrated: " + VarjoEyeTracking.IsGazeCalibrated());
}
//toggle gaze target visibility
if (Input.GetKeyDown(toggleGazeTarget))
{
gazeTarget.GetComponentInChildren <MeshRenderer>().enabled = !gazeTarget.GetComponentInChildren <MeshRenderer>().enabled;
}
// if gaze is allowed and calibrated we can get gaze data
if (VarjoEyeTracking.IsGazeAllowed() && VarjoEyeTracking.IsGazeCalibrated())
{
//Get device if not valid
if (!device.isValid)
{
GetDevice();
}
//show gaze target
gazeTarget.SetActive(true);
//Get data for eyes position, rotation and fixation point.
if (device.TryGetFeatureValue(CommonUsages.eyesData, out eyes))
{
if (eyes.TryGetLeftEyePosition(out leftEyePosition))
{
leftEyeTransform.localPosition = leftEyePosition;
}
if (eyes.TryGetLeftEyeRotation(out leftEyeRotation))
{
leftEyeTransform.localRotation = leftEyeRotation;
}
if (eyes.TryGetRightEyePosition(out rightEyePosition))
{
rightEyeTransform.localPosition = rightEyePosition;
}
if (eyes.TryGetRightEyeRotation(out rightEyeRotation))
{
rightEyeTransform.localRotation = rightEyeRotation;
}
if (eyes.TryGetFixationPoint(out fixationPoint))
{
fixationPointTransform.localPosition = fixationPoint;
}
}
}
// Set raycast origin point to vr camera position
rayOrigin = vrCamera.transform.position;
// Direction from VR camer towards eyes fixation point;
direction = (fixationPointTransform.position - vrCamera.transform.position).normalized;
//RayCast to world from VR Camera position towards Eyes fixation point
if (Physics.SphereCast(rayOrigin, gazeRadius, direction, out hit))
{
//put target on gaze raycast position with offset towards user
gazeTarget.transform.position = hit.point - direction * targetOffset;
//make gaze target to point towards user
gazeTarget.transform.LookAt(vrCamera.transform.position, Vector3.up);
// Scale gazetarget with distance so it apperas to be always same size
distance = hit.distance;
gazeTarget.transform.localScale = Vector3.one * distance;
// Use layers or tags preferably to identify looked objects in your application.
// This is done here via GetComponent for clarity's sake as example.
RotateWithGaze rotateWithGaze = hit.collider.gameObject.GetComponent <RotateWithGaze>();
if (rotateWithGaze != null)
{
rotateWithGaze.RayHit();
}
// alternative way to check if you hit object with tag
if (hit.transform.CompareTag("FreeRotating"))
{
AddForceAtHitPosition();
}
}
else
{
//If not hit anything, the gaze target is shown at fixed distance
gazeTarget.transform.position = vrCamera.transform.position + direction * floatingGazeTargetDistance;
gazeTarget.transform.LookAt(vrCamera.transform.position, Vector3.up);
gazeTarget.transform.localScale = Vector3.one * floatingGazeTargetDistance;
}
}
void Update()
{
// Request gaze calibration
if (Input.GetKeyDown(calibrationRequestKey))
{
VarjoEyeTracking.RequestGazeCalibration(gazeCalibrationMode);
}
// Set output filter type
if (Input.GetKeyDown(setOutputFilterTypeKey))
{
VarjoEyeTracking.SetGazeOutputFilterType(gazeOutputFilterType);
Debug.Log("Gaze output filter type is now: " + VarjoEyeTracking.GetGazeOutputFilterType());
}
// Check if gaze is allowed
if (Input.GetKeyDown(checkGazeAllowed))
{
Debug.Log("Gaze allowed: " + VarjoEyeTracking.IsGazeAllowed());
}
// Check if gaze is calibrated
if (Input.GetKeyDown(checkGazeCalibrated))
{
Debug.Log("Gaze calibrated: " + VarjoEyeTracking.IsGazeCalibrated());
}
// Toggle gaze target visibility
if (Input.GetKeyDown(toggleGazeTarget))
{
gazeTarget.GetComponentInChildren <MeshRenderer>().enabled = !gazeTarget.GetComponentInChildren <MeshRenderer>().enabled;
}
// Get gaze data if gaze is allowed and calibrated
if (VarjoEyeTracking.IsGazeAllowed() && VarjoEyeTracking.IsGazeCalibrated())
{
//Get device if not valid
if (!device.isValid)
{
GetDevice();
}
// Show gaze target
gazeTarget.SetActive(true);
if (gazeDataSource == GazeDataSource.InputSubsystem)
{
// Get data for eye positions, rotations and the fixation point
if (device.TryGetFeatureValue(CommonUsages.eyesData, out eyes))
{
if (eyes.TryGetLeftEyePosition(out leftEyePosition))
{
leftEyeTransform.localPosition = leftEyePosition;
}
if (eyes.TryGetLeftEyeRotation(out leftEyeRotation))
{
leftEyeTransform.localRotation = leftEyeRotation;
}
if (eyes.TryGetRightEyePosition(out rightEyePosition))
{
rightEyeTransform.localPosition = rightEyePosition;
}
if (eyes.TryGetRightEyeRotation(out rightEyeRotation))
{
rightEyeTransform.localRotation = rightEyeRotation;
}
if (eyes.TryGetFixationPoint(out fixationPoint))
{
fixationPointTransform.localPosition = fixationPoint;
}
}
// Set raycast origin point to VR camera position
rayOrigin = xrCamera.transform.position;
// Direction from VR camera towards fixation point
direction = (fixationPointTransform.position - xrCamera.transform.position).normalized;
}
else
{
gazeData = VarjoEyeTracking.GetGaze();
if (gazeData.status != VarjoEyeTracking.GazeStatus.Invalid)
{
// GazeRay vectors are relative to the HMD pose so they need to be transformed to world space
if (gazeData.leftStatus != VarjoEyeTracking.GazeEyeStatus.Invalid)
{
leftEyeTransform.position = xrCamera.transform.TransformPoint(gazeData.left.origin);
leftEyeTransform.rotation = Quaternion.LookRotation(xrCamera.transform.TransformDirection(gazeData.left.forward));
}
if (gazeData.rightStatus != VarjoEyeTracking.GazeEyeStatus.Invalid)
{
rightEyeTransform.position = xrCamera.transform.TransformPoint(gazeData.right.origin);
rightEyeTransform.rotation = Quaternion.LookRotation(xrCamera.transform.TransformDirection(gazeData.right.forward));
}
// Set gaze origin as raycast origin
rayOrigin = xrCamera.transform.TransformPoint(gazeData.gaze.origin);
// Set gaze direction as raycast direction
direction = xrCamera.transform.TransformDirection(gazeData.gaze.forward);
// Fixation point can be calculated using ray origin, direction and focus distance
fixationPointTransform.position = rayOrigin + direction * gazeData.focusDistance;
}
}
}
// Raycast to world from VR Camera position towards fixation point
if (Physics.SphereCast(rayOrigin, gazeRadius, direction, out hit))
{
// Put target on gaze raycast position with offset towards user
gazeTarget.transform.position = hit.point - direction * targetOffset;
// Make gaze target point towards user
gazeTarget.transform.LookAt(rayOrigin, Vector3.up);
// Scale gazetarget with distance so it apperas to be always same size
distance = hit.distance;
gazeTarget.transform.localScale = Vector3.one * distance;
// Prefer layers or tags to identify looked objects in your application
// This is done here using GetComponent for the sake of clarity as an example
RotateWithGaze rotateWithGaze = hit.collider.gameObject.GetComponent <RotateWithGaze>();
if (rotateWithGaze != null)
{
rotateWithGaze.RayHit();
}
// Alternative way to check if you hit object with tag
if (hit.transform.CompareTag("FreeRotating"))
{
AddForceAtHitPosition();
}
}
else
{
// If gaze ray didn't hit anything, the gaze target is shown at fixed distance
gazeTarget.transform.position = rayOrigin + direction * floatingGazeTargetDistance;
gazeTarget.transform.LookAt(rayOrigin, Vector3.up);
gazeTarget.transform.localScale = Vector3.one * floatingGazeTargetDistance;
}
if (Input.GetKeyDown(loggingToggleKey))
{
if (!logging)
{
StartLogging();
}
else
{
StopLogging();
}
return;
}
if (logging)
{
int dataCount = VarjoEyeTracking.GetGazeList(out dataSinceLastUpdate);
foreach (var data in dataSinceLastUpdate)
{
LogGazeData(data);
}
}
}