public void GetGazeData()
{
VarjoEyeTracking.GazeData eyeTrackingData = VarjoEyeTracking.GetGaze();
_eyeGazeData.Timestamp = 1e-6f * eyeTrackingData.captureTime;
_eyeGazeData.isRayValid = eyeTrackingData.status == VarjoEyeTracking.GazeStatus.Valid;
_eyeGazeData.Origin = eyeTrackingData.gaze.origin;
_eyeGazeData.Direction = eyeTrackingData.gaze.forward;
float dist = eyeTrackingData.focusDistance;
_eyeGazeData.Distance = dist;
_eyeGazeData.isDistanceValid = 0.01f < dist && dist < 2f;
}
void LogGazeData(VarjoEyeTracking.GazeData data)
{
string[] logData = new string[18];
// Gaze data frame number
logData[0] = data.frameNumber.ToString();
// Gaze data capture time (nanoseconds)
logData[1] = data.captureTime.ToString();
// Log time (milliseconds)
logData[2] = (DateTime.Now.Ticks / TimeSpan.TicksPerMillisecond).ToString();
// HMD
logData[3] = xrCamera.transform.localPosition.ToString("F3");
logData[4] = xrCamera.transform.localRotation.ToString("F3");
// Combined gaze
bool invalid = data.status == VarjoEyeTracking.GazeStatus.Invalid;
logData[5] = invalid ? InvalidString : ValidString;
logData[6] = invalid ? "" : data.gaze.forward.ToString("F3");
logData[7] = invalid ? "" : data.gaze.origin.ToString("F3");
// Left eye
bool leftInvalid = data.leftStatus == VarjoEyeTracking.GazeEyeStatus.Invalid;
logData[8] = leftInvalid ? InvalidString : ValidString;
logData[9] = leftInvalid ? "" : data.left.forward.ToString("F3");
logData[10] = leftInvalid ? "" : data.left.origin.ToString("F3");
logData[11] = leftInvalid ? "" : data.leftPupilSize.ToString();
// Right eye
bool rightInvalid = data.rightStatus == VarjoEyeTracking.GazeEyeStatus.Invalid;
logData[12] = rightInvalid ? InvalidString : ValidString;
logData[13] = rightInvalid ? "" : data.right.forward.ToString("F3");
logData[14] = rightInvalid ? "" : data.right.origin.ToString("F3");
logData[15] = rightInvalid ? "" : data.rightPupilSize.ToString();
// Focus
logData[16] = invalid ? "" : data.focusDistance.ToString();
logData[17] = invalid ? "" : data.focusStability.ToString();
Log(logData);
}
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);
}
}
}
